twin sphere flanged - Thorburn Flex Inc

NON-METALLIC EXPANSION JOINTS AND CONNECTORS
FOR PIPING AND DUCTING SYSTEMS
■ High Pressure Expansion Joints
■ Round and Rectangular Expansion Joints
■ Special Purpose Teflon Expansion Joints
■ Moulded Expansion Joints
■ Elbow Connectors and Fittings
■ High Temperature Expansion Joint Systems
Thorburn Flex Inc
Flexible Piping Specialist
3rd Edition
Thorburn Flex Inc
Flexible Piping Specialist
173 Oneida Drive, Pointe-Claire,
Quebec, Canada H9R 1A9
Tel.: 514-695-8710 / Fax: 514-695-8716
Toll free: 1-800-363-6613 (USA & Canada)

Thorburn Flex Inc
Flexible Piping Specialist
THORBURN’S EMPLOYMENT OF
STATE-OF-THE-ART TECHNOLOGY
Thorburn’s committment to development is
reinforced through the use of CAD (Computer
Aided Design) system technology and finite
engineering analysis, which permits Thorburn
to pinpoint potential critical areas and provide
timely sound engineered solutions
FOUNDER, Jack Thorburn
Shown is Jack Thorburn, who founded the
company in 1954, enjoying one of his passions,
sailing. Unfortunately, Jack passed away on
February 16th 1995. He will be sorely missed.
The company’s leadership passed on to Jack’s
eldest son, Robert, in September 1994.
Thorburn is an innovative manufacturer of specialized
engineered flexible piping systems (i.e. custom hose
assemblies and expansion joints). Since 1960, Thorburn’s
corporate mission evolution and business philosophy
have been customer driven and targeted to select niche
applications where Thorburn can achieve clear positions
of sustainable technological and market-share leadership.
DESIGNING, BUILDING AND SUPPLYING
THE WORLD’S FINEST
EXPANSION JOINT AND CONNECTOR SYSTEMS

THORBURN THE FLEXIBLE PIPING SPECIALIST
EXPERIENCE YOU CAN DEPEND ON
Since 1960, Thorburn has devoted its expanding
facilities and engineering expertise to the design,
development and manufacture of flexible piping
systems. Integrally associated with this product mix
are Thorburn’s non-metallic expansion joints and
connectors for piping and ducting systems.
Specify Thorburn ducting and piping
expansion joints and connectors and put your
mind to rest.
■ Emergency shut-down products at your service
Tell us when you need the expansion joint or connector.
Usually, we can supply sizes up to 36” in two days, 54” in
three days and sizes up to 72” in four days.
■ Compatible product line
Thorburn has the most complete line of expansion joints
and connectors in the industry. If we don’t have it, it’s not
made. Call Thorburn for your single source of supply.
■ Quality control
Thorburn has a rigid certified quality control system to
provide you with consistent quality products.
■ Design integrity
Thorburn’s non-metallic expansion joints are designed
for tough, demanding industrial, commercial and
municipal applications, such as: air conditioning, heating
and ventilating systems, petrochemical, industrial process
piping systems, power generating (fossil fuel and nuclear
plants), marine, pulp and paper, waste water and sewage
systems.
Page 1
QUALITY CONTROL
■ CSA CAN3 Z299.1 certified
■ ISO 9001
■ Nuclear to ASME Section III NCA-4000
Subsection NQA-1 CSA N285.0
■ Welders and welding procedures ASME
Section IX; VIII B31.1 and B31.3
■ ASME B31.1, B31.3 Pressure piping
certification
■ Full traceability if required
■ Size round up to 144” I.D.
Rectangular, your design limits or our
shipping door 14’ x 19’
Test programs and design verification tests
■ Expansion joint deflection test under design
pressure
■ Burst and hydrostatic testing to 150,000 psi
■ Seismic and shock loading analysis
■ External pressure testing for underwater
service
Our sincerest thanks to the many valued
customers who have purchased Thorburn’s
flexible piping products over the years. We look
forward to working together with you and
meriting your continued support for many years
to come.
Robert Thorburn
President

THORBURN THE FLEXIBLE PIPING SPECIALIST
SUMMARY OF THORBURN'S NON-METALLIC
FLEX CONNECTORS AND EXPANSION JOINTS
MIGHTY-SPOOL HIGH PRESSURE PIPING EXPANSION JOINTS
SPECIAL HAND BUILT LOW PRESSURE
ROUND AND RECTANGULAR EXPANSION JOINTS
Summary
Thorburn's custom designed low pressure round and rectangular elastomeric
expansion joint systems.
Arch profile: No arch to extra wide multiple arches.
End connections: Integral moulded flat-face flanged drilled to
your requirements or with labour saving cuff ends.
Pressure/Temperature range:: Full vacuum to 25 psi / -60ºF
to 400ºF.
Size: Round up to 144"; Rectangular up to 19' x 14'.
Specials: Can be made with concentric and eccentric, with special
flanges, offsets or transition.
SPECIAL PURPOSE TEFLON EXPANSION JOINTS
Summary
Summary
Thorburn's traditional work horse is the handcrafted elastomeric expansion joint system.
It can be custom designed to suit specific application requirements. Available with any
known elastomeric compound.
Arch profile: High narrow arch design available with single, multiple or filled arches.
End connections: Integral moulded flat-face drilled to your requirements or cuff ends
with labour saving.
Pressure/temperature range: Full vacuum to 300 psi / -60ºF to 400ºF
Size I.D.: 1" to 144"
Specials: Can be made with concentric, eccentric, special flanges, offsets, transition or
from heavy duty externally pressurized designs.
For extra high pressure external pressurized expansion joints, see page 67
Teflon is the most versatile media resistant compound known to man
and Thorburn offers the industry the broadest range of teflon expansion
joints, either in moulded pure PTFE or teflon lined rubber or metal.
Arch profile: Various to suit application.
End connections: Flanged and drilled to your requirements.
Pressure/Temperature range: Full vacuum to 300 psi / -60ºF to 400ºF.
Size: 1/2" to 96" round.
Page 2
FOR DETAILS SEE PAGES 13 TO 20, 67
FOR DETAILS SEE PAGES 22 TO 23
FOR DETAILS SEE PAGES 54 TO 67

THORBURN THE FLEXIBLE PIPING SPECIALIST
SUMMARY OF THORBURN'S NON-METALLIC
FLEX CONNECTORS AND EXPANSION JOINTS
MOULDED EXPANSION JOINTS FOR DETAILS SEE PAGES 34 TO 41
Summary
Thorburn's moulded expansion joint series are economical joints and come in three basic
styles: 1) Extra wide arch for double the movement per arch with full faced rubber flanges;
2) Spherical self-cleaning arch system with floating flanges; 3) Small diameter spherical
arch with threaded female ends. Thorburn's moulded expansion joints are made from only
limited amounts of elastomers.
Arch profile: Long flowing self-cleaning style available in single or double moulded arches
or multiple handbuilt versions.
End connections: Flanged and female union style.
Pressure/Temperature range: 26" Hg to 300 psi / -60ºF to 300ºF.
Size I.D.: 1/2" to 36" round.
Special: The moulded arch design can be made in a handbuilt version.
ELBOW PUMP CONNECTORS AND FITTINGS FOR DETAILS SEE PAGES 42 TO 53
Summary
Thorburn's rubber elbow connectors and fittings are designed to
replace metallic or rubber lined products for pipe vibration, noise
reduction or lateral movement. They are available in economical
moulded as well as handbuilt versions. Available in any size of known
elastomers.
Arch profile: No arch, smooth tube.
Pressure/Temperature range: Full vacuum to 300 psi / -60ºF to
400ºF.
Size: Round up to 30".
Specials: Thorburn's custom fittings can be made with transition
joints, lateral, crosses or with custom radius elbows.
DUCTING EXPANSION JOINT SYSTEMS FOR DETAILS SEE PAGES 68 TO 84
Summary
Thorburn's Flexi-Duct Series FDR & FDC are non-metallic ducting expansion
joints custom built and designed to provide stress relief in ducting systems
by absorbing movement caused by thermal changes. They also act as vibration
isolators, shock-absorbers and compensate for minor misalignment.
Pressure: To ± 3 psi
Temperature: Model FDR: below 400ºF; Model FDC: above 400ºF
Special: Available in round or rectangular profiles
Page 3

THORBURN THE FLEXIBLE PIPING SPECIALIST
Introduction .................................................................... 6, 7
Pipe simulation testing ...................................................... 8
Applications
Thorburn 42HP-HDX is specifically designed to provide
under seawater piping relief with external or internal
pressure differentials up to 225 psi. Thorburn’s 42HP-
HDX technology was chosen for Canada’s largest
offshore oil rig project: Hibernia
Power generating industry ............................................. 9
Marine / Commercial HVAC applications ..................... 10
Waste water sewage treatment
and drinking water treatment plant applications .......... 11
Pulp and paper making process applications .............. 12
Spool type expansion joints
Introduction ............................................................ 13, 14
Technical specifications: pressure,
temperature, materials ................................................. 15
Model 42HP: dimensional specifications ..................... 16
Model 42HP movement/force/spring
rate with single open arch design ................................ 17
Models 42HP-CR (concentric) and 42HP-ER
(eccentric) reducers specifications ........................ 18, 19
Sleeve type Model 30DB ............................................. 20
Low pressure round and rectangular expansion joints
Models 15R (no arch) and 15RA (arch type) ............... 21
Models 42HPO (offset type) and 42HPEF
(enlarged flange type) .................................................. 21
Models 15RR-LP (rectangular) and 15R-LP (round) ... 22
Boot-Flex Model TCT ................................................... 23
TABLE OF CONTENTS
Page 4
Technical data on flanges and control units
Common flange dimension/drilling chart,
mating pipe thickness for expansion joints,
rubber pipe, retaining rings, control units ..................... 24
Split retaining ring technology ...................................... 25
Style CR Control rod assemblies - Introduction ........... 26
Control rod assembly dimensions, ratings,
how to order ................................................................. 27
Installation and guiding practices
Guiding, anchoring, installation, maintenance .... 28 to 31
How to order custom rubber pipe expansion joints . 32, 33
Moulded expansion joints
TM20 Extra wide arch - Introduction ............................ 34
TM20 Specifications .................................................... 35
Introduction to Precision moulded Easy-Flex long
flowing spherical arch expansion joint
Series 101, 102 and 201 ........................................ 36, 37
Easy-Flex Style 101 moulded single sphere
expansion joint system ................................................. 38
Shown is a Thorburn 60” Mighty-Spool Model
42HP multi-arch expansion joint system for the
Ste-Marthe-du-Cap-de-la-Madeleine, Quebec,
water treatment facility. This application’s
requirements included absorbing ground settling
movement and piping expansion.

THORBURN THE FLEXIBLE PIPING SPECIALIST
Easy-Flex Style 201 moulded twin sphere
expansion joint system ................................................. 39
Optional flange drilling ................................................. 40
Easy-Flex Style 102 twin-sphere female
metal threaded union rubber connectors ..................... 41
Elbow-Flex expansion joints Series REF/REFR .... 42, 43
Elbow connectors and fittings
Flanged pump connector Model 60RPC ................ 44, 45
Ultra-quiet coupled pipe connectors ............................ 46
Paper mill suction couch Model 28TW ......................... 47
Flexipipe 60TMH and 61TMH - Introduction ................ 48
Flexipipe custom rubber hand crafted flexible pipes
and fittings from 2” to 30” I.D. ....................................... 49
Flexipipe hose ends ..................................................... 50
How to order flexipipe assemblies ............................... 51
Thorburn’s special handcrafted rubber fittings ............. 52
Fitting dimensions and ordering details ....................... 53
Special purpose teflon expansion joints
Model 42HP Spool type teflon lined exp. joints ...... 54, 55
Easy-Flex Style 101 moulded teflon lined exp. joints ... 56
Molded teflon expansion joints
Power-Flex expansion joint system .............................. 57
Power-Flex movement specifications ........................... 58
How to calculate pressure temperature relationship
for Power-Flex teflon expansion joint system ............... 59
Thorburn’s lateral 60TMH-L custom rubber fitting system
TABLE OF CONTENTS
Page 5
Shown is Thorburn self-cleaning, long flowing, single
moulded spherical arch Series 101 expansion joint with
floating flanges
Power-Flex vacuum and dimensional data .................. 60
Power-Flex typical styles and ordering information ...... 61
Tef-Flex moulded PTFE expansion joints..................... 62
Tef-Flex movement, weight and liner length data ......... 63
Thor-Shield “safety shield” / Tef-Flex torque valves...... 64
Hot-Flex “HF” teflon lined metal exp. joint system ........ 65
Hot-Flex construction and ordering information ........... 66
Special expansion joints
Externally pressurized rubber expansion
joint system .................................................................. 67
Non-metallic ducting expansion joint systems
Flexi-Duct Series FDR & FDC - Introduction ............... 68
Why use non-metallic Flexi-Duct.................................. 69
Applications ................................................................. 70
Elastomeric and composite ducting - Introduction ....... 71
Flexi-Duct engineering design concepts ................ 72, 73
Flexi-Duct design considerations ........................... 74, 75
Angle frame styles ................................................. 76, 77
Moulded corner type “MC” ........................................... 78
Materials, temperature limits, chemical compatibility ... 79
How to order Flexi-Duct ......................................... 80, 81
Installation instructions .......................................... 82, 83
Data required ............................................................... 84
Thermal expansion of pipe .......................................... 85
Conversion Factors ................................................... 86, 87
Warning, Warranty ........................................................... 88

THORBURN THE FLEXIBLE PIPING SPECIALIST
THORBURN ELASTOMERIC PIPING EXPANSION
JOINT AND CONNECTOR SYSTEM
■ Flexible piping system
Thorburn’s elastomeric expansion joint
and connector piping systems are
sections of flexible pipe which are
inserted into a rigid piping
system. Regardless of materials
and construction arrangements, Thorburn’s
rubber piping expansion joints
and connectors are designed to absorb
various types of movements in a
specified pressure/temperature range.
■ Relieves piping stress
The purpose of Thorburn’s rubber
piping expansion joints is to relieve
strain and stress in a piping system
caused by thermal changes,
misalignment, seismic activity,
equipment vibration, load stresses,
pump surges or ground settling.
TYPICAL THORBURN 42HP
SPOOL TYPE ARCH DESIGN
CROSS
SECTION
Metal Wire
Rubber
Tube
Carcass
Fabric
Reinforcing
Cushion
Rubber
Rubber
Cover
Whether your piping problem is
misalignment, noise or movement
induced, let Thorburn’s
expansion joint technology show
you the way!
■ Shape size range
Round 1/2” to 144” I.D. Rectangular up to 20 feet; also
available custom concentric, eccentric and transition ends
custom built from various elastomers and fabrics. If you
have any requirements, call Thorburn for a timely solution.
■ End connections
Flanged (metric/imperial), CUFF (Clamp-on style) or
beaded for swivel flanged connections.
■ Expansion joint arch types
Custom handbuilt spool, double movement extra wide, long
flowing spherical or no arch are custom designed by
Thorburn to meet specific application requirements.
THORBURN’S RUBBER EXPANSION JOINTS AND CONNECTORS
QUALITY ASSURANCE CERTIFICATION AND COMPLIANCE
■ ASME B31.1 and B31.3 pressure piping registration
■ Rubber Manufacturers Association IP-2
■ Fluid Sealing Association (FSA), Rubber Expansion Joint Division, Technical
Handbook 5th and 6th Ed.
■ CSA CAN3 Z299.1 QMI certified / N285.0 Class 6
■ ISO 9001
■ ASME Section III NCA-4000 Subsection NQA-1 (nuclear Class 1, 2, 3), N285.0
■ Welders and Welding Procedures, ASME section IX, VIII B31.1 and B31.3
THORBURN 60TMH
AND 61TMH FLEXIBLE
RUBBER PIPE
CONNECTORS
Page 6
Helical wire reinforcement Tube
Split retaining rings
Fabric reinforcement
Thorburn style 60TMH (wire reinforced), 61TMH (non wire
reinforced) flexible rubber pipe connectors, Model 60RPC
pump connectors and fittings are reinforced straight rubber
pipes fabricated from various elastomers and fabrics primarily
designed to absorb noise and vibration in a piping system.
These custom connectors are also available as elbows, tees,
laterals. In addition, Thorburn has the design and
manufacturing capabilities to supply custom moulded branch
and transition assemblies end. End connections’ types are the
same as for rubber expansion joints.
Thorburn’s rubber pipe connectors are detailed on pages 42 to 53

THORBURN THE FLEXIBLE PIPING SPECIALIST
THORBURN RUBBER EXPANSION JOINT SYSTEM
MEANS QUALITY PROTECTION EVERY TIME
Thorburn rubber expansion joints are custom designed by engineers
and fabricated by skilled craftsmen following rigid step-by-step
quality control standards. Thorburn’s rubber expansion joints are used
to address and solve defined pipe motion problems. If you have a
specific requirement or want to reduce maintenance cost in your
piping system, specify the right product the first time by calling
Thorburn’s flexible piping specialist team today.
Typical hand built Thorburn
rubber expansion joint
Typical metallic bellows
expansion joint
Thorburn’s rubber pipe expansion joints absorb
and isolate movement better. Here is why:
■ High resistance to shock
Unlike a metal joint, Thorburn rubber expansion joints absorb movements
in all directions without stress and are capable of preventing unexpected
shock induced movements caused by pumps, blowers and other agitating
equipment, particularly during plant start-ups or shutdowns.
Page 7
Thorburn’s rubber expansion joint’s compact
design simplifies installation
THORBURN RUBBER EXPANSION
JOINT’S DISTINCTIVE ADVANTAGES
■ Compact to simplify installation
■ Absorbs movement in all directions
■ Reduces mechanical noises
■ Compensates for misalignment
■ Eliminates electrolysis between
dissimilar metals
■ Relieves strain in the piping system
■ Doesn’t require gaskets
■ Vibration and sound absorption
Thorburn’s elastomeric joints offer significant advantages over a metallic joint, preventing transmission of vibration without harming
the joint.
■ Freedom from embrittlement
Failure of a metal expansion joint is due primarily to continuous flexing and built-up stress points resulting in a fracture at the point
of embrittlement . Constant/intermittent flexing keeps the rubber “alive” and eliminates flex cracking in Thorburn’s rubber expansion
joints.
■ Great recovery from movement
When a metal joint is fully compressed, it assumes a permanent set. Thorburn’s rubber expansion joint continues to return to its
original position.
■ Freedom from corrosion
To achieve comparable corrosion resistancy metal bellows would have to employ exotic alloys at a tremendous cost. In addition,
Thorburn’s rubber expansion joints in sea water will not corrode nor does the continuous flexing permit scale to form.
■ Superior abrasive and erosion resistance
Thin metallic bellows will typically wear out at the root over time with minimum abrasion, where as a rubber joint can be manufactured
with a smooth abrasion resistant lining to protect it from the harmful effects of sea water salt, slurry and other abrasive media.

THORBURN THE FLEXIBLE PIPING SPECIALIST
FIRST IN RUBBER EXPANSION JOINT PIPE
SIMULATION TESTING
Thorburn is the only manufacturer capable of testing large diameter rubber expansion joints up to
120” I.D. under actual design pressure or vacuum conditions, while simulating any design movement or
series of movements experienced in a piping system during operation (i.e. design axial compression,
extension and/or lateral deflection movements).
Shown is Thorburn’s 42HP expansion joint subjected to a
pressurized axial extension movement
Increases quality and reduces costs
Thorburn’s pipe simulator has dramatically increased the safety
and quality standards of rubber expansion joints while reducing
costly and dangerous failures from occurring during commissioning
or during actual service.
Shown is Thorburn’s 42HP spool type arch profile subjected to
pressurized compression movement
Page 8
Exclusive Thorburn technology
Thorburn’s pipe simulator allows rubber expansion joints to be
subjected to actual field conditions before being put into service.
Therefore, it provides the means to truly verify expansion joint
performance and design capabilities as well as detect any defective
or faulty expansion joints before commissioning them into service.
Shown is an arch profile of Thorburn’s 42HP subjected to lateral
movement under positive or negative pressure
Typical applications for pipe simulator
■ Superior verification testing
Engineers and designers preferring to increase the quality of
its piping system can specify Thorburn pipe simulation testing
to verify the expansion joint design and performance
capabilities before putting new expansion joints into service.
■ Power generating industry preventive maintenance
testing
The quality standards required by both fossil fuel and nuclear
electrical power generating industries can benefit by periodical
pipe simulation testing of its existing expansion joints to verify
the quality and uncover any potential weakness that could
lead to a dangerous and costly failure.

THORBURN THE FLEXIBLE PIPING SPECIALIST
POWER GENERATING INDUSTRY
Thorburn has extensive successful experience in designing, manufacturing and supplying high pressure elastomeric expansion
joints up to 108” (274 cm) I.D. to the world’s fossil fuel and nuclear power electrical generating stations.
TYPICAL THORBURN RUBBER
EXPANSION JOINT APPLICATIONS
FOUND IN POWER GENERATING
STATIONS
■ Condenser circulating water
system pump inlet and outlet
■ Raw service water pump inlet and
outlet
■ Raw service water system heat
exchanger inlet and outlet
■ Raw service water strainer outlet
■ Raw service water discharge line
to the header
REACTOR BUILDING
Fuel
Loading
Machine Reactor
Steam
Typical Thorburn expansion joint
being installed at electrical
generator station
TURBINE BUILDING
Turbine
Thorburn’s expansion joints were chosen for the AECL designed Candu Korean
Wolsong 2, 3, 4 nuclear power generating stations
Thorburn’s pipe simulator specialists pressure/vacuum testing
Thorburn style 42HP rubber expansion joints under full design
dynamic movement conditions
Generator
Circulating
Water
Page 9
Thorburn’s packaging professionals
meticulously preparing a 108” I.D.
Thorburn 42HP joint for shipment
Power industry expansion joints routing and location
N.B. Power engineer inspecting a 24” I.D. Thorburn 42HP
expansion joint at the Belledune generating station unit 2

THORBURN THE FLEXIBLE PIPING SPECIALIST
MARINE APPLICATIONS
Thorburn rubber expansion joints provide an economical solution in the isolation of noise transmission,
vibration and connecting misaligned pipe found in offshore platforms and large marine vessels.
Thorburn rubber expansion joints were chosen for
Canada’s and one of the world’s largest off shore oil
drilling platform. The Hibernia Project is situated in the
Atlantic Ocean off the coast of Newfoundland, Canada.
■ Air intake on diesel engines
■ Ballast
■ Between scoop and the condensers
■ Circulating lines to the condenser
■ Fog foam lines
■ Schools ■ Stores ■ High rise office towers ■ Hotels
Thorburn rubber expansion joints were
chosen to provide stress and noise relief for
the Canada Post headquarters building’s
piping system in Ottawa, Ontario, Canada
TYPICAL MARINE INSTALLATIONS
■ Fire and bilge pump lines
■ Forced draft lines
■ Overboard discharge
■ Sanitation system
■ Ventilation lines
Typical Thorburn rubber expansion joint
location and routing
■ Air ducts ■ Compressor lines ■ Circulating water lines ■ Pump suction and discharge ■ Turbine to condenser ■ Refrigeration
Page 10
Thorburn’s marine vessel rubber expansion joints routing and
location
OFFSHORE APPLICATIONS
■ Mud pump-lines
■ Diesel fuel lines
■ Fresh water and sea water lines
■ Permanent ballast water secondary
containment piping system
COMMERCIAL AND INSTITUTIONAL BUILDINGS
AIR CONDITIONING, HEATING, VENTILATION SYSTEMS
■ Apartment buildings
■ Hospitals
Typical commercial and institutional
building installations for Thorburn rubber
expansion joints

THORBURN THE FLEXIBLE PIPING SPECIALIST
WASTE WATER SEWAGE TREATMENT
DRINKING WATER TREATMENT PLANTS
Consultants specify Thorburn rubber expansion joints
and fittings to maximize design flexibility
■ Aeration lines
■ Raw sewage lines
■ Grit pump lines
Installing a typical rubber expansion
joint in a waste water sewage
treatment plant
■ Sludge pumps
■ Sinter sludge ash lines
Page 11
Thorburn’s rubber expansion joints were chosen for the multimillion
dollar “Ville de Québec” water filtration project
1 Aeration basin floating cover: connections are served with Thorburn’s 60TMH
assemblies to provide the required flexibility to cover the changing level with
variations in sewage flow.
2 Air blowers: make extensive noise and the discharge is very hot. Thorburn high
temperature (chlorobutyl) model TM20 joint can reduce noise by over 20 decibels.
The air blower inlet side is connected with a Thorburn 30DB clamp-on type
expansion joint to isolate vibration and pipe movement.
3 Sludge pump lines are ideally suited for Thorburn long flowing arch style 202
expansion joints. These expansion joints relieve stress from ground settlement or
pipe and pump vibration misalignment.
4 Thorburn 60TMH-E elbow fittings have proven even to outwear stainless steel
elbows. Therefore, maintenance is greatly reduced for example on extremely
abrasive slurry lines, such as sinter sludge ash.
5 Thorburn 60TMH custom assemblies provide the required flexibility and design
to dump sludge from plant to truck and loading docks or barge.
Typical waste water treatment plant

THORBURN THE FLEXIBLE PIPING SPECIALIST
■ Process piping systems
■ Slurry lines
■ Heating and cooling systems
■ Pump inlet and discharge lines
Saveall
Beater
PULP AND PAPER MAKING PROCESS
Applications for Thorburn rubber expansion joints and
custom connectors
Wood source
Power supply
Refiner
Schematic view of pulp & paper processing.
■ Black liquor lines
■ Suction box
■ Causticizer and digester piping
■ White water piping
Pulpwood
stacker Barking drum Water purification
Washer Chipper Chip
storage bin
Bleached
pulp
storage
Jordan
Flow
box
Steam and
power plant
Mixing box
Dandy
roll
FOURDRINIER
Suction
boxes Suction roll
Pulp washers
PRESSES
Bleaching
Bleaching
Bleaching
Screens
Slice
Felt
blankets
Case study: When Bowater
Mersey Paper Co. had a
problem with expansion joints
located on their white water
piping system, Thorburn
provided the solution with its
42HP Series teflon lined
rubber expansion joint system.
Problem solved!
Chip
conveyors Digestor Blow
tank Slaked
lime
storage
Unbleached
pulp
storage
DRYERS
Page 12
Brown
stock
Size press
Cooking
liquor
Evaporator
Black
liquor
Calender
Green
liquor
storage
Green
liquor
mixing tank
Waste
treatment plant
Slaking
tank
Lime
sludge
CALENDERS
Lime
Kiln
Slitter
Filter
Winder
Thorburn’s flexible rubber piping and fitting technology was
used to upgrade the traditional open trough piping found
between the caustizer and slacker tank at Miramichi Pulp and
Paper in New Castle, N.B.

THORBURN THE FLEXIBLE PIPING SPECIALIST
MIGHTY-SPOOL
HIGH QUALITY SPOOL JOINT SYSTEM
35LP LOW PRESSURE 50SP MEDIUM PRESSURE 42HP HIGH PRESSURE 42HPX EXTRA HIGH PRESSURE
Mighty-Spool Light-Weight
Model 35LP and Multiple Arch
Expansion Joint
Thorburn Mighty-Spool single and
multiple arch types are available in
light-weight series Model 35LP. Dimensionally
the same as the standard
product, except for reduced body thickness,
this series is designed for very
low pressure and vacuum applications.
Mighty-Spool multiple arch expansion
joints are composites of the single arch
design and are capable of movements
of a single arch multiplied by the
Mighty-Spool Hand Crafted Quality
Thorburn’s Mighty-Spool expansion joints are the work horses of our rubber expansion
joint line meeting or exceeding the design requirements listed in the FSA type A.1, A.2 and
A.3 spool arch type joints. Thorburn does not employ marginal practices or materials,
which reduce safety factors. All Thorburn Mighty-Spool joints meet a minimum 4 to 1
safety factor at rated operating temperatures and pressures. Thorburn’s standard Model
42HP High Pressure represents 65% of our sales.
Fig. 1: Mighty-Spool single
open arch design
Mighty-Spool Filled Arch System
Thorburn Mighty-Spool open arch design may be modified to reduce
possible turbulence, prevent the collection of solids in the arch way, which
could obstruct the joint movement. To solve such problems, Thorburn’s
Mighty-Spool joints may be supplied with a bonded-in place soft filler rubber
in the arch, providing a smooth interior bore. It should be noted that filled
arches reduce movement capability to half (50%) and increase the spring rate
by 4 times of the normal movements and spring rates of comparable size,
Mighty-Spool open arch expansion joints. This general rule is similar for all
Thorburn rubber expansion joints with filled arches.
A
Flange & Ret. Ring O.D.
Nominal Pipe Size
Joint I.D.
B C
F
G
E
D
To order Mighty-Spool expansion joints,
please see pages 32 and 33 for details.
Steel Retaining Ring
Page 13
Thorburn Mighty-Spool expansion joints are
available in sizes from 1” to 144” I.D.
Steel Retaining Ring
Fig. 2: Mighty-Spool multiple open arch design
number of arches. The spring rate for a multi-arch type expansion joint is equal to the spring rate for a single arch design divided by the
number of arches. This general rule is similar for all Thorburn rubber expansion joints.
In order to maintain lateral stability and prevent sagging when the joint is installed in a horizontal position, a maximum number of arches
supplied is 4.
Special note: Thorburn can provide special designs to accommodate movements of
30” (600 mm). If greater movement or special ends are required in your piping system,
call Thorburn flexible piping specialists today for an economical and timely solution.
A
A
Equally Spaced
Bolt Holes
Hole
Die
Bolt Circle Bolt
A
Flange & Ret. Ring O.D.
Nominal Pipe Size
Joint I.D.
B C
Spool type expansion joint with filled and open arch
design with a flange by sleeve type connecting end
F
Section AA
G
E
D

THORBURN THE FLEXIBLE PIPING SPECIALIST
Thorburn’s rubber expansion joint
construction features
Though Thorburn manufactures and supplies a wide
variety of expansion joints, all our rubber joints have
4 basic components: tube, reinforcement, cover and
end connections. Shown to the right is Thorburn Mighty-
Spool high pressure joint with integral flange.
Tube:
Seamless elastomeric leak proof lining specifically
designed to maintain fluid leak tight integrity of the
expansion joint and protect the carcass from penetration
or saturation of the media being transferred. Thorburn’s
expansion joint tubes can be designed to transfer chemical
and petroleum products, sewage, gases as well as abrasive
media.
MIGHTY-SPOOL
BUILT-IN QUALITY PIPE JOINTS
Thorburn 108” Model
42HP
Cover placement
during expansion joint
rubber moulding and
carcass building stages
Typical Mighty-Spool cross-section expansion joint with integral flanges
Page 14
STYLE 42HP
Integral flange
Gap filler hard rubber
Metallic
reinforcement
Protective cover
High profile arch
Reinforcement:
a) Fabric Reinforcement: The fabric reinforcement is the flexible and supporting member between the tube and cover. Fabrics of
high strength synthetic fibres are used depending on pressure and temperature requirements. All fabric plies are calendered to
permit flexibility between the fabric plies and to reduce service strain.
b) Metallic Reinforcement: Consists of coated high tensile spring steel wire and/or solid steel rings embedded in the carcass. The
purpose of the metallic reinforcements is to strenghten the joint permitting the rated working pressures and to supply the joint with
the necessary rigidity for thermal vacuum service. Specially compounded filler rubbers are used between the layers of metallic
reinforcement to prevent migration when pressurized. Special metallic reinforcement is used when Thorburn rubber expansion
joints are used for external service.
Cover:
The primary function of the cover is to protect the carcass from outside damage or abuse. Special elastomers can be supplied to resist
chemicals, oils, sunlight, acid fumes, ozone, sea water, etc.
End connections:
Integral flanges are constructed of fabric reinforcement, smooth finish, full-faced flange that form a tight seal against the mating pipe
flanges without the need of gaskets. Also available are soft cuff clamp-on ends designed to fit over a pipe and be clamped on.
Inner liner
Carcass
Thorburn Mighty-Spool single open arch design being prepared for
hydrostatic pressure testing

THORBURN THE FLEXIBLE PIPING SPECIALIST
TECHNICAL SPECIFICATIONS
THORBURN RUBBER PIPE EXPANSION JOINT AND PIPE CONNECTORS
Nominal
Design of Expansion Joint Construction
Pipe Size Model 35LP Model 50SP Model 42HP Model 42HPX
I.D. of Low Pressure Medium Pressure High Pressure Extra High
Exp. Design Design Design Pressure Design
Joint FSA Series A FSA Series B FSA Series C
Positive Negative Positive Negative Positive Negative Positive Negative
Inches PSIG in. of hg. PSIG in. of hg. PSIG in. of hg. PSIG in. of hg.
1/4 to 4 165 26 165 30 200 30 300 30
5 to 12 140 26 140 30 190 30 275 30
14 85 15 65 30 130 30 225 30
16 to 20 65 15 50 30 110 30 200 30
22 to 24 65 15 45 30 100 30 175 30
26 to 40 55 15 45 30 90 30 150 30
42 to 66 55 15 40 30 80 30 150 30
68 to 96 45 15 40 30 70 30 125 30
98 to 108 40 15 40 30 60 30 90 30
110 to 144 30 15 40 30 50 30 80 30
Nominal
Pipe Size
I.D. of
Exp.
Joint
Tolerances for Thorburn Rubber Pipe & Expansion Joints
Non-
Exp. critical
joint flange Bolt
Face to face length “F” 2 (inches)
All dimensions to be an average reading.
Applies to open or filled arch.
I.D. 1 O.D. 1 line 3 0 to 6 7 to 12 14 to 18 20 & up
0 to 10 ±3/16 ±1/4 ±3/16 ±1/8 +1/8 ±3/16 +3/16 4
-3/16 -1/4
12 to 22 ±1/4 ±3/8 ±1/4 ±1/8 +1/8 ±3/16 +3/16 4
-3/16 -1/4
24 to 46 ±3/8 ±1/2 ±5/16 +1/8 ±3/16 +3/16 ±1/4 4
-3/16 -1/4
48 to 70 +3/8 +3/4 ±3/8 ±3/16 +3/16 ±1/4 +1/4 5
-1/2 -1/2 -1/4 -5/16
72 & up +3/8 +1 ±1/2 +3/16 ±1/4 +1/4 +1/4 6
-5/8 -3/4 -1/4 -5/16 -3/8
1) All diameters to be measured with a “Pi” tape.
2) All linear dimensions to be measured with a steel rule and averaged.
3) Bolt line = Actual I.D. + 2 (Average “X” Dimension) + Bolt hole diameter
Mechanical Vibration in a Steel Piping System Reduced with the
Installation of Thorburn’s Pipe Connectors or Expansion Joints
Pipe
Installation in Pipe with a:
System
Vibration
Frequency
Expansion Joint
8” ID x 6” F/F
Vibration reduction at
Rubber Pipe
8” ID x 24” F/F
Vibration reduction at
HZ 10 PSIG 50 PSIG 80 PSIG 10 PSIG 50 PSIG 80 PSIG
40 37% 55% 72% 87% 91% 93%
68 60% 68% 78% 95% 96% 99%
125 44% 50% 60% 98% 99% 99%
250 44% 50% 50% 96% 97% 99%
500 65% 89% 90% 91% 93% 94%
1000 90% 96% 98% 82% 91% 96%
2000 94% 95% 96% 99% 99% 99%
4000 90% 93% 97% 99% 99% 99%
8000 89% 89% 94% 97% 97% 98%
Example: If an 8” steel piping system had a major vibration frequency of 1000 HZ at 50 PSIG,
the installation of an expansion joint into the system, the percentage of reduction of vibration
would be 96%.
# of
Measurements
to
be
Averaged
Page 15
Pressure Characteristics of Thorburn
Mighty-Spool Expansion Joints
Notes:
1) Pressure limitations are based on a minimum 4 to 1 safety
factor at 180ºF (82ºC) for rated pressure.
2) For higher pressure and/or temperature expansion joint,
contact Thorburn flexible piping specialists for details.
3) Always advise Thorburn if expansion joint will be subjected
to full vacuum.
4) Model 42HP also available for external deep sea water
service. Please specify Thorburn Model 42HPX-HD and
provide all related service and design requirements.
Type of elastomer Class Type of fabric Class
Gum rubber Std. I Cotton Std. I
Natural rubber Std. I Rayon Std. I
SBR/GRS/Buna-S Std. I Nylon Std. II
Neoprene Std. II Polyester Spc. II
Buna-N/Nitrile Std. II Fiberglass/Asbestos Spc. II
Hypalon Std. II Asbestos Spc. II
Butyl Std. II Fiberglass Spc. II
Butyl, Chloro Spc. II Kevlar Spc. II
EPDM Spc. II Nomex Spc. II
Viton/Fluorel Spc. II
Silicone Spc. II
Teflon/TFE/FEP Spc. II
Maximum Service Temperature of Materials for
Thorburn’s Expansion Joints and Pipe Connectors
Stardard Class I - Recommended up to 180ºF
Standard Class II - Recommended up to 230ºF
Special Class II - Recommended for over 230ºF
Rubber Acoustical Impedance Compared
Sound Acoustical
velocity Density impendance Relative
Material (in./sec.) (lbs./in. 3 ) (lbs./in. 2 -sec.) Impendance
Steel 206,500 0.283 58,400 500.0
Copper 140,400 0.320 45,000 425.0
Cast iron 148,800 0.260 38,700 365.0
Lead 49,800 0.411 20,400 190.0
Glass 216,000 0.094 20,300 190.0
Concrete 198,000 0.072 14,200 134.0
Water 56,400 0.036 2,030 19.0
Pine 132,000 0.0145 1,910 18.0
Cork 19200 0.0086 165 1.6
Rubber 2,400 0.0442 106 1.0
Acoustical impedance is defined as the product of material density times velocity of
sound in that material. In acoustical systems low impedance corresponds to low sound
transmission. Relative impedance is based on Rubber = 1.0

THORBURN THE FLEXIBLE PIPING SPECIALIST
Nominal
Pipe Size
Exp. Jt. I.D.
1
1 1/4
1 1/2
2
2 1/2
3
4
5
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
40
42
48
50
54
56
60
66
72
78
84
96
108
144
MIGHTY SPOOL MODEL 42HP
QUALITY PROTECTING EXPANSION JOINTS
Note: Flange and retaining ring dimensions shown are in accordance with 125/150 pound standard drilling of: ANSI B16.1, B16.24, B16.51, MSS SP-44. Items marked with * are drilled to AWWA
C207-78 Table 1 Class D, Table 3, Class E. Retaining plate thickness “G” is 3/8” for all sizes.
For larger diameters, offsize diameters, special drilling, special lengths, greater movements, reducers transition connectors or other specials, call
Thorburn’s flexible piping team today at 1-800-363-6613.
Expansion Joint
Flange
Single
Arch
6
6
6
6
6
6
6
6
6
6
8
8
8
8
8
8
10
10
10
10
10
10
10
10
10
12
12
12
12
12
12
12
12
12
12
12
12
12
For pressure temperature and other specifications, please see page 15
“Face to Face” Minimum
Recommended Length
Two
Arch
10
10
10
10
10
10
10
10
10
10
12
12
12
12
12
12
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
16
16
16
16
16
Three
Arch
12
12
12
12
12
12
12
12
12
14
14
14
16
16
16
16
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
18
20
20
Typical 42HP
Single open arch
Four
Arch
14
14
14
14
14
14
14
14
16
16
16
16
20
20
20
20
22
22
22
22
22
22
22
22
22
24
24
24
24
24
24
24
24
24
24
24
24
24
Retaining
Ring I.D.
2 3/8
2 5/8
2 7/8
3 5/8
4 1/8
4 5/8
5 7/8
6 7/8
7 7/8
9 7/8
12 1/8
14 1/2
16 1/2
18 1/2
20 1/2
22 5/8
24 5/8
26 5/8
28 7/8
30 7/8
32 7/8
34 7/8
37
39
43
45 1/4
51 1/4
53 1/4
57 1/4
59 1/4
63 1/4
69 1/4
75 1/4
81 1/4
87 1/2
99 3/8
112 1/2
149 1/2
Standard Flange Dimensions
and Drilling
Flange
O.D.
4 1/4
4 5/8
5
6
7
7 1/2
9
10
11
13 1/2
16
19
21
23 1/2
25
27 1/2
29 1/2
32
34 1/4
36 1/2
38 3/4
41 3/4
43 3/4
46
50 3/4
53
59 1/2
61 3/4
66 1/4
68 3/4
73
80
86 1/2
93
99 3/4
113 1/4
126 3/4
167 1/4
Bolt
Circle
3 1/8
3 1/2
3 7/8
4 3/4
5 1/2
6
7 1/2
8 1/2
9 1/2
11 3/4
14 1/4
17
18 3/4
21 1/4
22 3/4
25
27 1/4
29 1/2
31 3/4
34
36
38 1/2
40 1/2
42 3/4
47 1/4
49 1/2
56
58 1/4
62 3/4
65
69 1/4
76
82 1/2
89
95 1/2
108 1/2
120 3/4
158 1/4
Page 16
No. of
Holes
4
4
4
4
4
4
8
8
8
8
12
12
12
16
16
20
20
20
24
28
28
28
32
32
36
36
44
44
44
48
52
52
60
64
64
68
72
84
Diameter
of Holes
5/8
5/8
5/8
3/4
3/4
3/4
3/4
7/8
7/8
7/8
1
1
1 1/8
1 1/8
1 1/4
1 1/4
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
1 5/8
1 5/8
1 5/8
1 7/8
1 7/8
1 7/8
1 7/8
1 7/8
1 7/8
2 1/8
2 1/8
2 3/8
2 5/8
3 3/8
“A”
9/16
9/16
9/16
9/16
9/16
9/16
9/16
9/16
5/8
3/4
3/4
3/4
7/8
7/8
7/8
1
1
1
1
1
1
1
1
1
1 3/16
1 3/16
1 3/16
1 3/16
1 3/16
1 3/16
1 3/16
1 3/16
1 3/16
1 1/4
1 1/4
1 1/4
1 1/4
1 3/8
FOR ORDERING DETAILS SEE PAGES 32 AND 33
Retaining
Ring
Typical 42HP
Single filled arch
Typical Mighty-Spool
Body Dimensions
“B”
1/2
1/2
5/8
3/4
7/8
7/8
7/8
7/8
7/8
7/8
1
1 3/16
1 3/16
1 3/16
1 3/16
1 1/4
1 1/4
1 1/4
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 5/8
1 5/8
1 5/8
1 5/8
1 3/4
Typical 42HP
Two open arches
“C”
1 1/8
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 1/4
1 1/4
1 1/4
1 1/2
1 1/2
1 1/2
2
2
2
2
2
2
2 1/4
2 1/4
2 1/4
2 1/4
2 1/4
2 1/4
2 1/4
2 1/2
2 1/2
2 1/2
2 1/2
2 1/2
2 1/2
2 1/2
2 1/2
2 1/2
2 1/2
2 1/2
2 1/2
2 1/2
“D”
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
3/4
3/4
3/4
3/4
3/4
3/4
7/8
7/8
7/8
1
1
1
1
1
1
1
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
“E”
7/16
7/16
7/16
1/2
1/2
1/2
1/2
1/2
1/2
5/8
11/16
11/16
3/4
3/4
3/4
25/32
25/32
25/32
1 3/16
1 3/16
1 3/16
1 3/16
1 3/16
1 3/16
1 3/16
29/32
29/32
29/32
29/32
29/32
29/32
29/32
29/32
1
1
1
1
1 1/8
Typical 42HP
Three open arches

THORBURN THE FLEXIBLE PIPING SPECIALIST
MIGHTY-SPOOL MODEL 42HP
MOVEMENT/FORCE/SPRING RATE WITH SINGLE OPEN ARCH DESIGN
Nominal
Pipe Size
Exp. Jt. I.D.
1
1 1/4
1 1/2
2
2 1/2
3
4
5
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
40
42
48
50
54
56
60
66
72
78
84
96
108
144
“Face to face”
minimum length
Inches of axial
compression
Non-Concurrent
Movement Capability
Inches of axial
extension
Inches of lateral
deflection
Degrees of
angular
movement
Total load lbs
for rated
compression
Page 17
Force Pounds
Total load lbs
for rated
extension
Total load lbs
for rated
lateral defl.
Total load foot
lbs for rated
angular move.
Force pounds
for 1” compression
mov.
Spring Rate
Force pounds
for 1” extension
mov.
Force pounds
for 1” lateral
deflection
Est. Wt (lbs)
Special notes on movement capability: 1) Filled arch construction reduces above movements by 50%. 2) To calculate movement of multiple arch type for compression extension and lateral
movements, take movement shown in the above table and multiply by the number of arches. 3) The degree of angular movement is based on the maximum extension shown. 4) Movement capability
shown is non-concurrent percentage used in one movement position must be deducted from the other movement position so that sum of movements don’t exceed 100%. 5) Movements shown are
based on proper installation practices. See Thorburn installation maintenance guide for details.
Special notes on force Pounds / Spring Rates: 1) Forces required to move Thorburn Mighty-Spool Model 42HP are based on zero pressure conditions and room temperature in the pipeline. 2)
These forces should be considered only as approximates, compensation must be made for more accurate forces based on materials of construction and actual service conditions. 3) Filled arch spring
rates are approximately 4 times that of a single open arch. 4) Multi-arch spring rates are equal to single arch divided by number of arches.
Axial
Compression
6
6
6
6
6
6
6
6
6
6
8
8
8
8
8
8
10
10
10
10
10
10
10
10
10
12
12
12
12
12
12
12
12
12
12
12
12
12
For pressure temperature and other specifications, please see page 15
7/16
7/16
7/16
7/16
7/16
7/16
7/16
7/16
7/16
11/16
11/16
11/16
11/16
11/16
13/16
13/16
13/16
15/16
15/16
15/16
15/16
15/16
15/16
15/16
1 1/16
1 1/16
1 1/16
1 1/16
1 1/16
1 1/16
1 1/16
1 1/16
1 1/16
1 1/16
1 1/16
1 1/16
1 1/16
1 1/16
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
3/8
3/8
3/8
3/8
3/8
7/16
7/16
7/16
1/2
1/2
1/2
1/2
1/2
1/2
1/2
9/16
9/16
9/16
9/16
9/16
9/16
9/16
9/16
9/16
9/16
9/16
9/16
9/16
9/16
Axial
Elongation
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
27.5
22.5
18.5
14.5
11.5
10.0
7.5
6.0
5.0
5.5
4.5
3.75
3.25
2.75
2.5
2.5
2.25
2.0
2.3
2.0
2.0
1.8
1.75
1.5
1.5
1.5
1.25
1.25
1.25
1.25
1.0
1.0
0.9
0.9
0.8
0.7
0.62
0.47
103
129
154
185
232
278
371
463
556
971
1214
1456
1274
1456
1638
2152
2367
2582
2869
3090
3311
3531
3752
3973
4414
4732
5408
5634
6085
6310
6761
7437
8113
8789
9465
10817
12169
16218
Typical Thorburn Rubber Expansion Joints
Angular Movement
Bending of the centerline
76
96
115
138
172
207
276
344
413
689
861
1033
904
1033
1163
1505
1656
1807
1990
2143
2297
2450
2603
2756
3062
3253
3717
3872
4182
4341
4651
5116
5581
6046
6511
7441
8372
11152
175
219
262
350
381
412
476
546
617
753
809
948
1117
1286
1420
1588
1648
1706
1829
1952
2075
2438
2801
3164
3338
3423
3866
4012
4303
4448
4736
5108
5477
5951
6425
7375
8325
11013
1
2
3
4
6
8
14
22
32
70
109
158
160
209
266
381
463
549
659
765
875
1000
1130
1266
1563
1745
2282
2460
2885
3081
3537
4288
5113
6022
6913
9409
13550
20164
Torsional Movement
Relation about the
centerline (twist)
235
294
353
423
530
635
848
1058
1271
1412
1766
2118
1853
2118
2382
2649
2913
3178
3060
3296
3532
3769
4002
4238
4708
4452
5087
5300
5724
5936
6360
6996
7632
8268
8904
10176
11448
15264
FOR ORDERING DETAILS SEE PAGES 32 AND 33
304
383
459
552
689
828
1104
1376
1652
1837
2296
2755
2411
2755
3101
3440
3785
4130
3980
4286
4594
4899
5602
5512
6124
5783
6608
6884
7435
7717
8268
9095
9922
10748
11575
13228
14883
19843
350
438
524
700
762
824
952
1092
1234
1506
1618
1896
2234
2572
2840
3176
3296
3412
3658
3904
4150
4876
5602
6328
6676
6846
7732
8024
8606
8896
9472
10216
10954
11902
12850
14750
16650
22026
Lateral Movement
Shear or perpendicular
to centerline
Joint
single arch
2
2.5
3
4
4.5
5.5
8
9
11
15
23
34
40
47
56
67
70
79
100
102
117
127
138
143
173
193
198
211
265
288
309
350
385
410
435
485
650
850
Retaining
ring set
2.3
2.5
3
4
5.5
6
7.5
8
9
12
18
22
25
27
29
35
44
48
53
58
66
75
88
91
106
116
138
154
163
184
200
246
300
325
350
432
540
700
Absorbing
Vibration

THORBURN THE FLEXIBLE PIPING SPECIALIST
MIGHTY-SPOOL
MODELS 42HP-CR AND 42HP-ER CONCENTRIC AND
ECCENTRIC REDUCER EXPANSION JOINTS
Thorburn’s Mighty-Spool concentric and eccentric reducers were specifically developed to connect
piping of unequalled diameters. These reducers were designed to replace and address the limitations
found in metal reducers in a pipeline.
Compare the Mighty-Spool advantages
over metallic reducers:
■ Absorbs pipe-wall and fluid-born noise
Thorburn’s reducers are quiet operating and
are designed to replace sound transmitting
metal reducers. Pipe-wall sound loses energy
and is absorbed as the noise carried by the
piping both enters and leaves the rubber section.
Fluid-born noise is absorbed by volumetric
expansion (breathing) of Thorburn’s Mighty-
Spool reducer. This action cushions water
hammer and smooths out pumping impulses.
■ Reduces system stress and strain /
Compensates for misalignment
Rigid attachment of piping to critical or
mechanical equipment can produce excessive
loading. Thermal or mechanically created
strain-stress-shock are cushioned and absorbed
with Thorburn’s Mighty-Spool reducers.
Thorburn’s reducers add a flexible component
that is automatically self correcting for
misalignment created by structural movements
caused by settling, expansion or ground shifts.
■ Less space, lower installation cost
Thorburn’s Mighty-Spool reducers replace a
metal reducer and a flexible element. Thus,
less space is required and installation is
simplified.
Page 18
Thorburn 42HP-CR Concentric
reducer expansion joint
Control Rod Bolt Circle
Control Rod Bolt Circle
Flange/Retaining Ring O.D.
Flange/Retaining Ring O.D.
Bolt Circle
Control
Rod
Plate Retaining
Ring
Optional
Compression Sleeve
Steel
Washer
Thorburn 42HP-ER Eccentric
reducer expansion joint
Standard
Pipe
Flange
Nominal
Pipe Size
Joint I.D.
Thorburn Model 42HP-CR concentric reducer rubber expansion
joint
Bolt Circle
Control
Rod
Plate Retaining
Ring
Optional
Compression Sleeve
Steel
Washer
Standard
Pipe
Flange
Nominal
Pipe Size
Joint I.D.
Thorburn Model 42HP-ER eccentric reducer rubber expansion joint

THORBURN THE FLEXIBLE PIPING SPECIALIST
42HP-CR
42HP-ER
Typical
Joint size
I.D.1 x I.D.2
x length
2 x 1 x 6
2 x 1.5 x 6
2.5 x 1.5 x 6
2.5 x 2 x 6
3 x 1.5 x 6
3 x 2 x 6
3 x 2.5 x 6
4 x 2 x 6
4 x 2 x 7
4 x 2.5 x 6
4 x 2.5 x 7
4 x 3 x 6
4 x 3 x 7
5 x 3 x 6
5 x 4 x 6
5 x 4 x 8
6 x 2 x 8
6 x 2.5 x 6
6 x 3 x 6
6 x 3 x 9
6 x 4 x 6
6 x 4 x 8
6 x 4 x 9
6 x 5 x 6
6 x 5 x 9
8 x 3 x 6
8 x 4 x 6
8 x 4 x 8
8 x 4 x 11
8 x 5 x 6
8 x 5 x 11
8 x 6 x 6
8 x 6 x 8
8 x 6 x 11
10 x 5 x 8
10 x 6 x 8
10 x 6 x 12
10 x 8 x 6
10 x 8 x 8
10 x 8 x 12
12 x 6 x 8
12 x 6 x 14
12 x 8 x 6
12 x 8 x 8
12 x 8 x 14
12 x 10 x 8
12 x 10 x 14
14 x 8 x 8
14 x 10 x 8
14 x 12 x 8
16 x 10 x 8
16 x 12 x 8
16 x 14 x 8
18 x 12 x 8
18 x 14 x 8
18 x 16 x 8
MIGHTY-SPOOL EXPANSION JOINTS
MODEL 42HP-CR CONCENTRIC AND
MODEL 42HP-ER ECCENTRIC REDUCERS SPECIFICATIONS
Total travel
compress –
Extend
(inches)
5.5 - 6.25
5.5 - 6.25
5.5 - 6.25
5.5 - 6.25
5.5 - 6.25
5.5 - 6.25
5.5 - 6.25
5.5 - 6.25
6.5 - 7.25
5.5 - 6.25
6.5 - 7.25
5.5 - 6.25
6.5 - 7.25
5.5 - 6.25
5.5 - 6.25
7.5 - 8.25
7.5 - 8.25
5.5 - 6.25
5.5 - 6.25
8.5 - 9.25
5.5 - 6.25
7.5 - 8.25
8.5 - 9.25
5.5 - 6.25
8.5 - 9.25
5.25 - 6.375
5.25 - 6.375
7.25 - 8.375
10.25 - 11.375
5.25 - 6.375
10.25 - 11.375
5.25 - 6.375
7.25 - 8.375
10.25 - 11.375
7.25 - 8.375
7.25 - 8.375
11.25 - 12.375
5.25 - 6.375
7.25 - 8.375
11.25 - 12.375
7.25 - 8.375
13.25 - 14.375
5.25 - 6.375
7.25 - 8.375
13.25 - 14.375
7.25 - 8.375
13.25 - 14.375
7.25 - 8.375
7.25 - 8.375
7.25 - 8.375
7.25 - 8.375
7.25 - 8.375
7.25 - 8.375
7.25 - 8.375
7.25 - 8.375
7.25 - 8.375
Movement Capability
Axial
compress
(inches)
Axial
extend
(inches)
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.75
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
.375
Lateral
deflect
(inches)
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
.5
Angular
deflect
(degree)
18.4
15.9
14.1
12.5
12.5
11.3
10.3
9.5
9.5
8.8
8.8
8.2
8.2
7.1
6.4
6.4
7.1
6.7
6.4
6.4
5.7
5.7
5.7
5.2
5.2
7.8
7.1
7.1
7.1
6.6
6.6
6.1
6.1
6.1
5.7
5.3
5.3
4.8
4.8
4.8
4.8
4.8
4.3
4.3
4.3
3.9
3.9
3.9
3.6
3.3
3.3
3.1
2.9
2.9
2.7
2.6
Page 19
Degrees
torsion
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
2
2
2
2
2
2
1
1
1
Open arch
Thrust
Factor
12.69
14.32
16.04
17.87
17.87
19.79
21.6
23.92
23.92
26.15
26.15
28.46
28.46
33.38
38.70
38.70
33.38
35.99
38.70
38.70
44.41
44.41
44.41
50.51
50.51
56.64
63.49
63.49
63.49
70.76
70.76
78.42
78.42
78.42
86.46
94.90
94.90
112.95
112.95
112.95
113.10
113.10
132.57
132.57
132.57
153.76
153.76
177.09
201.46
277.40
227.40
254.91
283.99
283.99
314.65
346.88
Filled arch
3.14
3.14
4.97
4.97
7.06
7.06
7.06
12.57
12.57
12.57
12.57
12.57
12.57
19.63
19.63
19.63
28.27
28.27
28.27
28.27
28.27
28.27
28.27
28.27
28.27
50.27
50.27
50.27
50.27
50.27
50.27
50.27
50.27
50.27
78.54
78.54
78.54
78.54
78.54
78.54
113.10
113.10
113.10
113.10
113.10
113.10
113.10
153.94
153.94
153.94
201.06
201.06
201.06
254.47
254.47
254.47
Weight
(pounds)
Open arch
joint/rings
5.1
5.5
7.1
8.1
8.2
8.3
9.5
10.8
10.9
10.9
11.8
12.0
12.9
13.4
14.4
16.9
13.6
13.8
15.6
16.6
15.9
17.8
19.3
17.1
18.6
20.5
22.9
23.2
23.8
21.4
26.1
23.0
25.6
28.1
29.4
29.0
33.4
29.9
34.6
40.1
38.8
45.0
37.6
42.0
48.6
47.8
60.0
45.8
53.5
63.6
55.8
61.8
69.6
65.5
67.4
78.7
Control rod
assembly
6.0
6.3
7.1
7.4
7.1
7.0
7.1
7.1
7.1
7.6
7.6
7.5
7.5
11.5
10.1
10.1
11.6
11.9
12.3
12.5
10.6
11.0
11.0
10.5
11.9
20.4
18.6
19.5
21.0
18.4
20.6
17.5
18.1
19.6
27.0
26.0
27.5
24.5
25.3
27.8
29.0
30.5
28.0
28.8
30.1
24.3
26.1
29.0
29.4
26.6
35.8
36.0
36.5
37.0
37.0
33.8
Positive
P.S.I.G.
Pressure
Notes: 1) See Mighty-Spool single open arch for clarification or specifications. 2) To determine end-thrust: Multiply thrust factor by operating pressure of system. 3) The degree of taper should
not exceed 25º. 4) Where a taper is more than 15º, a filled arch is recommended. 5) Where a proposed taper is greater than 25º, Thorburn recommends a steel reducer be used and a Thorburn Mighty-
Spool type expansion joint be used in the adjacent piping. 6) Multiarch design will increase movement as shown, times number of arches. 7) Higher pressure available upon request.
For additional specifications, see page 15. For sizes not shown, increased movement, higher pressure temperatures, call 1-800-363-6613 and ask
to speak to a Thorburn flexible piping specialist with your requirements. To order Thorburn concentric/eccentric reducer expansion
joints, see pages 32 and 33 for details.
ALSO AVAILABLE IN EXTRA HIGH PRESSURE MODELS
42HP-CRX (Extra high pressure concentric reducer) and 42HP-ERX (Extra high pressure eccentric reducer) with pressures equaling 42HPX
200
200
200
200
200
200
200
200
200
200
200
200
200
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
190
130
130
130
110
110
110
110
110
110
Negative
in. of hg
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26

THORBURN THE FLEXIBLE PIPING SPECIALIST
Size
(inches)
1*
1.5*
2
2.5
3
4
6
8
10
12
14
16
18
20
24
36
48
60
72
“B”
Actual I.D.
1.315
1.900
2.375
2.875
3.500
4.500
6.625
8.625
10.750
12.750
14.000
16.000
18.000
20.000
24.000
36.000
48.000
48.000
72.000
“A” Typical4 Length (in.)
MIGHTY-SPOOL SLEEVE TYPE
MODEL 30DB
Slip-On Sleeve Type Expansion Joints
6
6
6
6
6
6
6
6
6
6
10
10
10
10
10
12
12
12
12
“C”
Cuff (inches)
2
2
2
2
2
2
2
2
2
2
3
3
3
3
3
4
4
4
4
Typical Thorburn Model
30DB double open arch
clamp-on expansion
joint with Thorburn
worm gear clamps
Compression
(inches)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Extension
(inches)
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
* Filled arches only
Note 1) Shown open arch system available in filled arch, two arch and 4 arch designs.
Note 2) Thorburn recommends not less than 2 clamps per cuff. For clamp details call Thorburn technical sales department.
Note 3) For additional technical details, see page 15.
Note 4) Detailed length should always be specified before time of order.
Lateral
(inches)
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
Working
Pressure
(PSI)
75
75
75
75
75
75
75
50
50
50
25
25
25
25
25
10
10
10
10
Page 20
Slip-on/Clamp-on rubber
expansion joint system
Thorburn’s Mighty-Spool 30DB are custom fabricated
expansion joints made in a single open, filled and/or
multiarch design. Mighty-Spool 30DB are specifically
designed for low pressure piping applications where
higher pressure flange is not required. The cuffs are
designed to fit over the end of a pipe and are secured by
the use of clamps.
ALSO AVAILABLE IN SLEEVE BY FLANGE DESIGN. SPECIFY MODEL 25DB.
For ordering
information
see pages 32 and 33
Slip-On Sleeve Type Triple Arch Expansion Joints
“B”
Actual I.D.
1.315
1.900
2.375
2.875
3.500
4.500
6.625
8.625
10.750
12.750
14.000
16.000
18.000
20.000
24.000
36.000
48.000
60.000
72.000
“A” Typical4 Length (in.)
10
10
10
10
10
10
11
11
11
11
15
15
15
15
15
17
17
17
17
“C”
Cuff (inches)
2
2
2
2
2
2
2
2
2
2
3
3
3
3
3
4
4
4
4
Compression
(inches)
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
Extension
(inches)
3/4
3/4
3/4
3/4
3/4
3/4
3/4
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 5/16
1 5/16
1 1/2
1 1/2
1 1/2
1 1/2
Lateral
(inches)
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
Working
Pressure
(PSI)
75
75
75
75
75
75
75
50
50
50
25
25
25
25
25
10
10
10
10

THORBURN THE FLEXIBLE PIPING SPECIALIST
SPECIAL MOULDED ROUND LOW PRESSURE EXPANSION JOINTS
MODEL 15R NON ARCH / 15RA ARCH TYPE
Low pressure round expansion joint system
■ Custom designed to suit application
■ Available in multiple and no arch designs
■ Integral moulded flange design
■ Contains pressures up to 25PSI/full vacuum
■ Available in wide choice of elastomers
Flange & Ret. Ring O.D.
Nominal Pipe Size
Joint I.D.
C
Bolt Circle
E
D
A
A
Equally Spaced
Bolt Holes
Bolt
Hole
Die
Flange & Ret. Ring O.D.
Nominal Pipe Size
Joint I.D.
Thorburn’s 15R “no arch” design provides dead tight sealing for pipe
chutes or low pressure (max 25 PSI) to full vacuum containment for
solids, liquids or air. Thorburn’s Model 15R is used when lateral
deflection, misalignment or vibration must be compensated in a
ducting or low pressure system.
Advantages
■ Elimination of corner failure
■ Elimination of costly gaskets
■ Abrasion resistant
■ Chemical resistant
■ Low force to deflect
FOR COMPLETE ORDERING INFORMATION PLEASE SEE PAGES 32 AND 33
Thorburn Model 42HP0 offset joints are custom designed and built to
remedy a specific misalignment and non-parallelism of 1/8” or more of
the axis of the piping to be connected. Thorburn offset joints are
A
B
F
G
Section AA
Page 21
Steel Retaining Ring
Model 15RA (arch
type) when axial
and lateral
movement is
required
Model 42HPO “Offset Type” Model 42HPEF
Enlarged Flange type
Flange & Ret. Ring O.D.
Nominal Pipe Size
Joint I.D.
B
F
A Retaining Rings
G
D
E
C
A
Flange & Ret. Ring O.D.
Nominal Pipe Size
Joint I.D.
frequently used in close quarters
where available space makes it
impractical to correct
misalignment with conventional
piping.
Conditions of offset and nonparallelism
must be stated. Offsets
can be made from targets supplied
by customer and flanges may be
supplied blank for drilling on job
site.
F
G
Thorburn’s 15RA “multi-arch”
design was chosen for the
aluminium smelters anode forming
vibrating compactor. Application
involves providing external full
vacuum sealing while absorbing
over 20” (508 mm) axial movement
at temperatures up to 400ºF
(204ºC). Thorburn can design
special arch profiles.
Thorburn’s Mighty-Spool Model 42HP-EF utilizes a full
faced integral flange design with an enlarged or special
drilled flange at
the other end. i.e.
Retaining Rings
8” pipe flange at
one end and 12”
G
E
flange at the
other end.
Flange & Ret. Ring O.D.
Bolt Circle
LARGE END
Nominal Pipe Size
Joint I.D.
B
C
D
SMALL END
Nominal
Pipe Size
Joint I.D.

THORBURN THE FLEXIBLE PIPING SPECIALIST
LOW PRESSURE
MODEL 15RR-LP RECTANGULAR and MODEL 15R-LP ROUND
MOULDED DUCTING EXPANSION JOINTS
Light-weight expansion joint system
■ Custom designed square, rectangular, oval, round
■ Integral moulded flange design
■ Contains pressure up to ± 3 psi
■ Available in wide choice of elastomers
■ Provides piping relief from vibration, thermal movement, shock and stress
Typical Installation Arrangement
Applications
■ Air, water, slurry
■ Pipe chutes
■ Forced draft lines
A Low Pressure No Arch Expansion Joint System
Rectangular 15RR-LP - Round 15R-LP
Maximum Movement Capabilities
Page 22
■ Custom designed
■ Square, rectangular,
oval
■ Internal moulded
flange design
Rectangular Flange/
Corner Detail
Movement at Shown Fully-Moulded Fully-Moulded Fully-Moulded Fully-Moulded
Face to face Connector Connector Connector Connector
Space
Space
Space
Space
between
between
between
between
Connector as mating
mating
mating
mating
Installed ducting
ducting
ducting
ducting
flanges
flanges
flanges
flanges
Axial
compression
Axial
extension
Lateral
offset
Axial
compression
Axial
extension
Neutral Position 6.00 0.50 0.25 0.25 9.00 1.00 0.25 0.50 12.00 1.50 0.50 0.75 16.00 2.00 0.50 1.00
Pre-Compressed 5.50 0.00 0.75 0.25 8.50 0.50 0.75 0.50 11.00 0.50 1.50 0.75 15.00 1.00 1.50 1.00
Note 1. Lateral offset figures are based on the assumption that all lateral movement occurs prior to compression movements. In practice, movements occur simultaneously thus the allowable
lateral offset would increase. Note 2. In vacuum applications a “set-back” design should be used. Note 3. Greater extension and/or lateral offset is gained through design of longer “built-in”
flanges. Note 4. Anchors should be located so rated movement is not exceeded. Note 5. For specific ordering information, please see page 28. Always specify pressure and temperature. Note 6.
Available round and arch design for greater movements. Call the Thorburn flexible piping specialists today.
Lateral
offset
FOR COMPLETE ORDER
INFORMATION SEE PAGES 32 AND 33
6” 9” 12” 16”
Axial
compression
Axial
extension
Lateral
offset
Axial
compression
Axial
extension
Lateral
offset

THORBURN THE FLEXIBLE PIPING SPECIALIST
HOW TO
ORDER
Code
1
LOW PRESSURE EXPANSION JOINTS
BOOT-FLEX MODEL TCT
Boot-Flex Model TCT
Boot-Flex construction is the ideal process for covers on rod and
ball screw applications. Not only are these airtight covers resistant
to oil, sand and metal chips, but they also provide an inside diameter
that increases rather than decreases as the cover is extended. These
covers combine the clean appearance of a moulded cover with the
strength found only in fabric base materials.
In the Boot-Flex process, a continuous sheet of
elastomer coated fabric is formed into a bellows
type cover with only one diagonal seam,
providing a completely sealed cover capable
of withstanding internal pressures of up to 15
PSI (Most applications involve very low
pressures).
Boot-Flex covers can be constructed of
neoprene, silicone, butyl, viton, hypalon or
buna-n elastomers with nylon, kevlar, or
fibreglass reinforcing fabrics.
Closed
Length
Model End type Material Accessories
1st 2nd
TCT-3 3 3 C C
Code
2
Flanged sealed connector. Thorburn
Model TCT-44.
Open Length
Page 23
Code
3
FLANGE (specify) INSIDE FLANGE (specify)
COLLAR (specify)
Typical Thorburn Boot-Flex expansion joint sealing system
Collar sealed connectors. Thorburn
Model TCT-33.
Elastomer
Material Codes
Thorburn MCOT
Type Code
Neoprene C 220ºF
Silicone L 500ºF
Butyl E 300ºF
Viton I 400ºF
Nitrile D 250ºF
Thorburn Model TCT-1 TCT-1.5 TCT-2 TCT-2.5 TCT-3 TCT-3.5 TCT-4 TCT-4.5 TCT-5 TCT-6 TCT-7 TCT-8 TCT-10
Inside Diameter (in.) 1 1.5 2 2.5 3 3.5 4 4.5 5 6 7 8 10
Outside Diameter (in.) 1.75 2.38 3 3.5 4.25 5 5.5 6 6.75 8 9 10 12
Maximum Open Length (in.) 24 24 24 24 24 24 24 24 24 24 24 24 24
Closed Length (in.) 5.25 4.5 4 4 3.25 3 3 3 2.5 2.25 2.25 2.25 2.25
Length
Code
4
Accessories Codes
R = Back flange ring
C = Clamps
= Nothing
Length
FLANGE TYPE COLLAR (specify)

THORBURN THE FLEXIBLE PIPING SPECIALIST
COMMON FLANGE DIMENSION/DRILLING CHART, MATING FLANGE THICKNESS FOR
THORBURN EXPANSION JOINTS, FITTINGS, RETAINING RINGS, CONTROL UNITS
Nominal Pipe Size
Expansion Joint
I.D.
1/4
3/8
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
66
72
78
84
90
96
102
108
120
132
144
ANSI B16.1 - 1975 CLASS 125 A
ANSI B16.24 - 1971 150 LB A
ANSI B16.5 - 1973 CLASS 150 A
AWWA C207-78 TABLE 1&2, CLASS B
AWWA C207-78 TABLE 1&2, CLASS D,
C
TABLE 3, CLASS E B
MSS SP-44 - 1975 CLASS 150 B
MSS SP-51 - 1965 MSS 150 LB A
Common Size Bolt Hole Size
O.D. B.C.
2 1/2
2 1/2
3 1/2
3 7/8
4 1/4
4 5/8
5
6
7
7 1/2
8 1/2
9
10
11
13 1/2
16
19
21
23 1/2
25
27 1/2
29 1/2
32
34 1/4
36 1/2
38 3/4
41 3/4
43 3/4
46
48 3/4
50 3/4
53
55 1/4
57 1/4
59 1/2
61 3/4
64
66 1/4
68 3/4
71
73
80
86 1/2
93
99 3/4
106 1/2
113 1/4
120
126 3/4
140 1/4
153 3/4
167 1/4
1 11/16
1 11/16
2 3/8
2 3/4
3 1/8
3 1/2
3 7/8
4 3/4
5 1/2
6
7
7 1/2
8 1/2
9 1/2
11 3/4
14 1/4
17
18 3/4
21 1/4
22 3/4
25
27 1/4
29 1/2
31 3/4
34
36
38 1/2
40 1/2
42 3/4
45 1/4
47 1/4
49 1/2
51 3/4
53 3/4
56
58 1/4
60 1/2
62 3/4
65
67 1/4
69 1/4
76
82 1/2
89
95 1/2
102
108 1/2
114 1/2
120 3/4
132 3/4
145 3/4
158 1/4
125/150 Lb. Drilling 250/300 Drilling Mating Flange Thickness
Drilling Column
No. of
Holes A B C O.D. B.C.
4
4
4
4
4
4
4
4
4
4
8
8
8
8
8
12
12
12
16
16
20
20
20
24
28
28
28
32
32
32
36
36
40
40
44
44
44
44
48
48
52
52
60
64
64
68
68
72
72
76
80
84
7/16
7/16
5/8
5/8
5/8
5/8
5/8
3/4
3/4
3/4
3/4
3/4
7/8
7/8
7/8
1
1
1 1/8
1 1/8
1 1/4
1 1/4
--
1 3/8
--
--
1 3/8
--
--
1 5/8
--
--
1 5/8
--
--
1 5/8
--
--
2
--
--
2
--
2
--
2 1/4
--
2 1/2
--
--
--
--
--
--
--
5/8
5/8
5/8
5/8
5/8
3/4
3/4
3/4
3/4
3/4
7/8
7/8
7/8
1
1
1 1/8
1 1/8
1 1/4
1 1/4
1 3/8
1 3/8
1 3/8
1 3/8
1 3/8
1 5/8
1 5/8
1 5/8
1 5/8
1 5/8
1 5/8
1 5/8
1 5/8
1 5/8
1 7/8
1 7/8
1 7/8
1 7/8
1 7/8
1 7/8
1 7/8
1 7/8
2 1/8
2 1/8
2 3/8
2 3/8
2 5/8
2 5/8
2 7/8
3 1/8
3 3/8
--
--
--
--
--
--
--
--
--
--
--
3/4
3/4
3/4
3/4
3/4
3/4
7/8
7/8
7/8
7/8
7/8
7/8
7/8
7/8
1
1
1
1
1
1
1 1/8
1 1/8
1 1/8
1 1/8
1 1/4
1 1/4
1 3/8
--
--
1 3/8
1 3/8
1 3/8
1 5/8
1 5/8
1 7/8
1 7/8
2 1/8
2 1/8
2 3/8
2 5/8
2 7/8
ANSI B16.1 - 1975 CLASS 250
ANSI B16.24 - 1971 300 LB
ANSI B16.5 - 1973 CLASS 300
MSS SP-44 - 1975 CLASS 300
No. of
Holes
-- -- -- --
-- -- -- --
3 3/4 2 5/8 4 5/8
4 5/8 3 1/4 4 3/4
4 7/8 3 1/2 4 3/4
5 1/4 3 7/8 4 3/4
6 1/8 4 1/2 4 7/8
6 1/2 5 8 3/4
7 1/2 5 7/8 8 7/8
8 1/4 6 5/8 8 7/8
9 7 1/4 8 7/8
10 7 7/8 8 7/8
11 9 1/4 8 7/8
12 1/2 10 5/8 12 7/8
15 13 12 1
17 1/2 15 1/4 16 1 1/8
20 1/2 17 3/4 16 1 1/4
23 20 1/4 20 1 1/4
25 1/2 22 1/2 20 1 3/8
28 24 3/4 24 1 3/8
30 1/2 27 24 1 3/8
33 29 1/4 24 1 5/8
36 32 24 1 5/8
38 1/4 34 1/2 28 1 3/4
40 3/4 37 28 1 3/4
43 39 1/4 28 2*
45 1/4 41 1/2 28 2
47 1/2 43 1/2 28 2
50 46 32 2 1/4*
46 43 32 1 5/8
48 3/4 45 1/2 32 1 3/4
57* 52 3/4*49 36* 2 1/4*
53 1/4 3/4 32 1 5/8
55 3/4 52 28 2
65* 60 3/4* 40* 2 1/4*
60 1/4 56 1/4 32 2 1/8
62 1/4 58 1/4 32 2 1/8
65 1/4 61 28 2 3/8
67 1/4 63 28 2 3/8
69 1/4 65 32 2 3/8
71 1/4 67 32 2 3/8
* Dimension shown does not meet
MSS-SP44
Note: When ordering/specifying
Thorburn expansion joints, rubber
pipe, retaining rings or control unit
assemblies, always note the mating
flange drilling specification or the
actual dimensions if specification is
unknown. In the absence of this data,
these products will be drilled to
ANSI B16.1 Class 125.
Page 24
Hole
Dia.
ANSI B16.1
CLASS 125
--
--
--
--
7/16
1/2
9/16
5/8
11/16
3/4
13/16
15/16
15/16
1
1 1/8
1 3/16
1 1/4
1 3/8
1 7/16
1 9/16
1 11/16
--
1 7/8
--
--
2 1/8
--
--
2 3/8
--
--
2 5/8
--
--
2 3/4
--
--
3
--
--
3 1/8
--
3 1/2
--
3 7/8
--
4 1/4
--
--
--
--
--
ANSI B16.24
150 LB
MSSS SP-51
9/32
9/32
5/16
11/32
3/8
13/32
7/16
1/2
9/16
5/8
11/16
11/16
3/4
13/16
15/16
1
1 1/16
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
ANSI B16.5
CLASS 150
--
--
7/16
1/2
9/16
5/8
11/16
3/4
7/8
15/16
15/16
15/16
15/16
1
1 1/8
1 3/16
1 1/4
1 3/8
1 7/16
1 9/16
1 11/16
--
1 7/8
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
AWWA C207
TABLE 1,
CLASS B
--
--
--
--
--
--
--
--
--
--
--
--
5/8
11/16
11/16
11/16
11/16
11/16
11/16
11/16
11/16
3/4
3/4
13/16
7/8
7/8
15/16
15/16
1
1
1
1 1/8
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 3/8
--
--
1 1/2
1 5/8
1 3/4
2
2
--
2 1/4
2 1/2
2 1/2
2 3/4
3
3 1/4
AWWA C207
TABLE 1,
CLASS D
--
--
--
--
--
--
--
--
--
--
--
--
5/8
11/16
11/16
11/16
13/16
15/16
1
1 1/16
1 1/8
1 3/16
1 1/4
1 5/16
1 5/16
1 3/8
1 1/2
1 1/2
1 5/8
1 5/8
1 5/8
1 3/4
1 3/4
1 3/4
1 3/4
2
2
2 1/8
--
--
2 1/4
2 1/2
2 5/8
2 3/4
2 3/4
--
3
3 1/4
3 1/4
3 1/2
3 3/4
4
AWWA C207
TABLE 2,
CLASS B&D
--
--
--
--
--
--
--
--
--
--
--
--
1/2
9/16
9/16
11/16
11/16
3/4
3/4
3/4
3/4
1
1
1
1
1
1 1/8
1 1/8
1 1/8
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 3/8
1 3/8
1 3/8
1 3/8
--
--
1 1/2
1 1/2
1 1/2
1 3/4
1 3/4
--
2
2 1/4
2 1/4
2 1/2
2 3/4
3
AWWA C207
TABLE 3,
CLASS E
--
--
7/16
1/2
9/16
5/8
11/16
3/4
7/8
15/16
15/16
15/16
15/16
1
1 1/8
1 3/16
1 1/4
1 3/8
1 7/16
1 9/16
1 11/16
--
1 7/8
2
2 1/16
2 1/8
2 1/4
2 5/16
2 3/8
2 3/8
2 1/2
2 5/8
2 5/8
2 11/16
2 3/4
2 3/4
2 7/8
3
--
--
3 1/8
3 3/8
3 1/2
3 7/8
3 7/8
--
4 1/4
4 5/8
4 5/8
5
5 3/8
5 3/4
AMSSS SP-44
CLASS 150
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
1 1/4
1 3/8
1 7/16
1 9/16
1 11/16
1 13/16
1 7/8
2 11/16
2 13/16
2 15/16
3 3/16
3 1/4
3 9/16
3 7/16
3 9/16
3 13/16
4
4 1/16
4 1/4
4 3/8
4 9/16
4 3/4
4 7/8
5 1/16
5 3/16
--
--
--
--
--
--
--
--
--
--
--

THORBURN THE FLEXIBLE PIPING SPECIALIST
THORBURN SPLIT RETAINING RING TECHNOLOGY
Providing Equal Pressure
Rubber to Metal Sealing Containment
Thorburn reinforced rubber flange split retaining rings
Series “RR”
Thorburn split and bevelled retaining rings must be used to equally distribute
the bolting pressure, ensuring a pressure tight seal. They are typically zinc
or galvanized steel for corrosion
resistance and drilled to required
specifications. Thorburn’s retaining
rings are installed directly against
the back of the flanges of the rubber
expansion joint and bolted through
the mating metal expansion flange
pipe. Rings are normally 3/8” thick
but can vary due to conditions.
Metal washers are used where the
rings are split. Thorburn’s retaining
rings are also available in stainless,
Inconel, Hasteloy, 6MO, Monel and
other materials upon request.
Example
Thorburn machining specialist preparing
to drill the matching bolt holes on
Thorburn’s back-up retaining rings
HOW TO ORDER THORBURN’S SPLIT RETAINING RING SETS SEPARATELY
E.J. Model-Size (in.) Ring set Material code
42HP-42 RR S4
Page 25
Thorburn’s precision machined drilled
zinc dichromate plated joint flange split
retaining rings are simply the world’s
finest product offering.
Thorburn machining specialists drilling the
retaining rings to the desired tolerances
Finishing process for Thorburn’s retaining
rings bevelled smooth with no rough edges,
which could damage the expansion joint
Material Codes:
Standard = carbon steel S4 = 304S S6 = 316SS X = Other specify

THORBURN THE FLEXIBLE PIPING SPECIALIST
THORBURN’S STYLE “CR” CONTROL ROD ASSEMBLY
Thorburn’s style “CR” control rod assembly system consists of two or more control rods extending from the mating
flanges of the expansion joint, minimizing possible damage to the expansion joint caused by excessive movement of
the pipeline. Thorburn’s control rod assembly systems are set at the maximum allowable expansion of the joint and
absorb the static pressure thrust developed at the expansion joint. Over-compression of the expansion joints can be
controlled by installing rubber pipe sleeves over the control rods. The length of the pipe sleeve is such that the expansion
joint cannot be compressed beyond its maximum allowable compression capabilities.
Thorburn’s three nut control rod unit standard
Thorburn utilizes a second nut at one end of its control
rod while the other end of the rod has its nut permanently
tack welded in place. This design 1) permits safe,
easy installation and disassembly (for scheduled
maintenance or repair) of the control rod unit; 2) allows
the control rod assembly unit to be adjusted after the
joint has had time to settle; 3) makes it impossible to
vibrate loose; 4) resists the axial extension loads of the
piping system.
Double Nut
Design
Typical Thorburn spool type expansion joint with optional spherical
washer control rod assembly/installation of Thorburn’s control rod
assembly style “CR”
Nut
Mating
Pipe
Flange
Spherical
washer
Convex washer
Control
Rod
Plate
Retaining
Ring
Control rod plate
Concave washer
Nut
Convex washer
Optional
Compression Sleeve
Control rod
Spherical washer
Concave washer
Illustrating Thorburn’s spherical washer system
dispensing equal axial and lateral load distribution
Tack
Welded Nut
With
optional
spherical
washer
Control rod
Control rod plate
Page 26
Enlarged view of Thorburn’s standard control rod assembly
Thorburn’s superior performing spherical
washer system
Thorburn’s spherical washer design eliminates the problems
associated with the traditional flat steel rubber washer
design. In particular, the inadequate compressive strength
of the flat steel rubber washer design 1) does not allow for
equal dispersement of axial or lateral forces; 2) it extrudes
out to failure shortly after being subjected to the design
system working pressures thus rendering itself useless.
Thorburn’s superior spherical washer
enhances the performance of the control rod
system for three reasons:
✓ It allows the designed torsional, lateral and angular
movements to occur with a smooth non binding action.
✓ Under axial load allows all the forces to travel through
the control rod system while maintaining a level altitude
on the existing force plane.
✓ During extreme lateral movement disperses the forces
equally on the control rod unit.

THORBURN THE FLEXIBLE PIPING SPECIALIST
Plate
O.D.
Installed
(in)
6.5
6.7
8.1
8.6
8.8
10.6
11.9
12.3
12.2
12.7
12.8
14.9
17.9
20.4
23.8
25.9
28.2
30.1
32.4
35.3
37.8
40.3
42.5
44.8
47.8
50.5
53.3
56.0
57.6
60.2
62.6
64.5
66.7
68.9
71.2
73.5
75.9
78.2
81.0
84.0
88.2
94.7
101.4
108.4
115.4
122.9
137.3
180.0
DIMENSIONS AND RATINGS
Typical Thorburn control rod system with spherical washers
CONTROL UNIT MAXIMUM SURGE
Dimensions
Plate
Thickness
(in)
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
1/2
1/2
3/4
3/4
3/4
3/4
3/4
3/4
1
1
1
1 1/4
1 1/4
1 1/4
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
1 3/4
1 3/4
1 7/8
1 7/8
2
2 1/4
2 1/2
2 1/2
2 3/4
3
Rod
Diameter
(in)
1/2
1/2
1/2
1/2
1/2
5/8
5/8
5/8
5/8
5/8
5/8
5/8
3/4
7/8
1
1
1 1/8
1 1/8
1 1/8
1 1/4
1 1/4
1 1/4
1 3/8
1 1/2
1 1/2
1 5/8
1 3/4
1 3/4
1 1/2
1 5/8
1 5/8
1 5/8
1 3/4
1 3/4
1 3/4
2
2
2
2
2
2
2
2 1/4
2 1/4
2 1/2
2 3/4
2 3/4
3
Standard
Control Unit
Assembly of:
Rods
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
6
Plates
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
8
8
8
8
8
8
8
8
12
Nominal
Pipe
Size
Exp. Jt.
I.D.
(in)
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
66
72
78
84
90
96
108
144
OR TEST PRESSURE
OF THE SYSTEM
PSIG
Number of Control
Rods Recommended
2 3 4 6 8
1328
1106
949
830
510
661
529
441
365
311
235
186
163
163
160
112
113
94
79
85
74
62
65
70
63
72
69
63
42
48
44
41
40
37
35
43
40
38
35
33
30
25
28
24
26
29
18
13
--
--
--
--
--
--
--
--
547
467
353
278
244
244
240
167
170
141
118
128
110
93
98
105
94
107
103
94
63
72
66
61
60
56
53
64
60
56
53
50
44
38
42
37
40
43
28
19
--
--
--
--
--
--
--
--
729
622
470
371
326
325
320
223
227
187
158
171
147
124
130
141
125
143
138
125
85
96
88
82
81
75
70
86
80
75
71
66
59
50
56
49
53
58
46
26
--
--
--
--
--
--
--
--
--
--
--
--
--
488
481
335
340
281
236
256
221
186
195
211
188
215
207
188
127
144
133
122
121
112
105
128
120
113
106
100
89
75
84
73
79
86
68
39
Page 27
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
453
375
315
342
294
248
261
281
251
286
276
251
169
192
177
163
161
150
140
171
160
150
141
133
119
101
112
98
106
115
91
52
NOTES:
1. Recommended plate thickness and rod diameter based on a
yield strength of 36,000 PSI with a maximum allowable
stress of 23,400 PSI (65% of yield). Rod and plate load
based on thrust, calculated using typical Thorburn arch inside
diameter dimensions.
2. A “Standard Control Unit Assembly” is generally furnished
when ordered, if specifications and/or order does not call
out a specific number of control rods.
3. The pressures listed do not relate to the actual design pressure
of the expansion joint product, but are the maximum
pressure for a specific control rod number/dimension.
Thorburn’s typical control rod assembly with a 2
plates, 1 rod, 3 nuts, 2 metal and rubber washers
How to Order Thorburn
Control Rod Assemblies
Separately
[Size (in)] + [CR] + [Rod Number] + [Options
(SW= Spherical Washer; IW= Insulation Washer)] +
[Material]
Examples:
1) 6 CR2 (Two (2) rod assembly sets for 6” ID
joint)
2) 6 CR2-SW (Two (2) rod assembly sets
complete with a spherical washer system)
Material codes
Standard = carbon steel S4 = 304S
S6 = 316SS X = Other specify

THORBURN THE FLEXIBLE PIPING SPECIALIST
GUIDING AND ANCHORING PRACTICES
WITH RUBBER EXPANSION JOINT SYSTEMS
It is absolutely necessary that rigid metal pipe on both ends of the rubber expansion joint be properly anchored to
eliminate the danger of excessive elongation. Anchors should be provided at:
■ A change in pipe size ■ A change of pipe direction
■ A branching of pipe ■ The end of a pipe run
WARNING: An expansion joint should never be used to
support the piping.
Fig. 1 - Typical piping layout utilizing Thorburn expansion joints
and the proper use of anchors in branch locations
Flow
Pipe guides
Solid
foundation
Pipe guides used
to prevent pipe
displacement
Pump
Thorburn rubber
expansion joints
without control
rod assembly
Solid
anchors
designed to withstand
the thrust and any other forces
imposed on the system at these points
Fig. 3 - Typical piping layout showing the use of control units
with the expansion joints when proper system anchoring
is limited
Anchor
Thorburn rubber
expansion joints
with control units
Pipe sleeve
Solid anchor (see Fig. 1)
Solid
foundation
Typical
pipe guides
Page 28
Fig. 2 - Typical piping layout utilizing Thorburn rubber expansion
joints when equipment and piping are properly
anchored
Flow
Pipe guides used
to prevent pipe
displacement
Pump
Solid
anchors
(see Fig. 1)
Thorburn rubber
expansion joints
without control rod
assembly
Elbow support anchored to pump base
so that no pumping forces are transmitted
to the flanges of the pump itself
Solid base
foundation
Employing Thorburn’s control rod assembly system to
protect your piping system
The use of Thorburn’s control rod assembly in Fig. 3 permits the
expansion of the pipeline in both the vertical and horizontal directions
between the pump and the anchor at the 45º bend to the
design limitations of Thorburn’s expansion joint and no further.
WARNING: When anchoring is not present in a piping run, it is
mandatory that a properly designed Thorburn control rod assembly be
employed with its expansion joints. Without the use of Thorburn’s control
rod assembly in Fig. 3, the pipeline between the pump and the anchor at
the 45º bend would be severely displaced because the piping systems’
pressure thrust forces would cause Thorburn’s rubber expansion joints
to extend until they rupture.
Fig. 4 - Thrust formula and location of expansion joint arch I.D.
T = þ (D) 2 (P)
4

THORBURN THE FLEXIBLE PIPING SPECIALIST
INSTALLATION INSTRUCTIONS FOR THORBURN’S
NON-METALLIC PIPE CONNECTORS AND EXPANSION JOINTS
A) Check requirements of the system. Double-check the performance
limits of Thorburn's rubber expansion joints against the anticipated
operating conditions. Expansion joints should never be subjected to
operating conditions beyond the temperature, pressure and/or vacuum
recommendations of the manufacturer. If the total joint deflection
caused by the initial installation and the movements of pipelines
during system operation exceed Thorburn's specifications or its general
arrangement drawing (maximum allowable movement), then the pipeline
should be altered to reduce the initial installation deflections.
B) Check the opening. Re-measure to ensure the face-to-face is accurate.
Any variance from the specified opening will reduce the total allowable
movements by the amount of variance. Please note: Movement for
Thorburn's rubber expansion joints are non-concurrent and the
percentage of their sum cannot exceed 100%.
C) Align piping system. Thorburn's rubber expansion joints should
never be used to compensate for misalignment unless such
misalignment is a calculated basis of design. If the system cannot be
aligned to within 1/8", an offset expansion joint should be used.
D) Check anchors, supports and alignment guides. To limit and
control the pipe movements that Thorburn's expansion joints must
absorb, the line should be anchored and properly supported.
Paragraph 319.1 of ANSI B31.3 1980 states that: "Piping systems
shall have sufficient flexibility to prevent thermal expansion or contraction
of movements of piping supports and terminals from causing:
a. Failure of piping or supports from overstress or fatigue;
b. Leakage at joints; or,
c. Detrimental stresses or distortion in piping or in connected
equipment (pumps, turbines or valves, for example) resulting
from excessive thrusts and movements in the piping."
1. Spare parts should be stored in a cool, dark, dry place in a flat position (Do not store on flange edges). Ideal storage is a warehouse with a relatively dry, cool
location. Store flange face down on a pallet or wooden platform. Do not store other heavy items on top of a Thorburn expansion joint. Ten year shelf-life can be
expected with ideal conditions. If storage must be outdoors, Thorburn’s joints should be placed on wooden platforms and should not be in contact with the ground.
Cover with a tarpaulin.
2. Large joint handling. Do not lift with ropes or bars through the bolt holes. If lifting through the bore, use padding or a saddle to distribute the weight. Make sure
cables or forklift tines do not contact the rubber. Do not let Thorburn expansion joints sit vertically on the edges of the flanges for any period of time.
3. System tests should not exceed 150% of the rated working pressure of the expansion joints. Systems should not be operated above the rated pressure or
temperature of the expansion joints.
4. Insulating over expansion joints is not recommended. If insulation is required, it should be designed for easy removal so the periodic inspection procedure can
be maintained. This facilitates periodic inspection of the tightness of the joint bolting.
5. Welding should not take place in the vicinity of the expansion joints. If welding occurs frequently above the expansion joint, a protective shield should be installed.
6. If underground installation is necessary, a protective shield over the expansion joint should be provided. Back-filling directly onto the expansion joints is not
recommended.
7. Submerged in water. Contact Thorburn for specific recommendations.
PRE-INSTALLATION CHECKLIST
Page 29
Even if your particular piping system does not fall under the jurisdiction
of the B31 piping codes, their guidelines are the industry standard
for accepted good practice.
In any case, Thorburn's rubber expansion joints and flexible pipe
connectors are not designed to support the weight of the piping
system. If the system is not properly supported or anchored to B31
piping codes, control rods must be installed. See pages 25 to 27 for
additional information.
E) Check mating flanges. The mating flanges to be attached with the
flanges of Thorburn's expansion joints or pipe connectors must be
clean. Mating metal flanges should not have more than a 1/16"
raised face. Used parts should be carefully examined for reasonable
smoothness, and any adhering particles of old gasketing or other
foreign material should be scraped off, taking care not to gouge or
mutilate the flange surface.
F) Check expansion joint cover. Check the outside cover of the joint
for damage before placing in service. The cover is designed to keep
harmful materials from penetrating the carcass of the joint. If the
cover is damaged and carcass is visible, it should be repaired
before submitted into service.
G) Verify expansion joint location. It can be stated generally that the
proper location of Thorburn's rubber expansion joints is close to a
main anchoring point. Following the joint in the line, a pipe guide or
guides should be installed to keep the pipe in line and prevent
undue displacement of this line. This is the simplest application of
a joint, namely, to absorb the expansion and contraction of a pipeline
between fixed anchor points.
General precautions before installation

THORBURN THE FLEXIBLE PIPING SPECIALIST
INSTALLATION INSTRUCTIONS FOR THORBURN’S
NON-METALLIC PIPE CONNECTORS AND EXPANSION JOINTS
EXPANSION JOINT INSTALLATION TIPS
1. Alignment. Pipelines containing standard expansion joints should be
lined up accurately before installing the joints. If the joints are to be
installed with appreciable initial misalignment, compression or elongation,
the amount of these deflections should be deducted from the
specified allowable movements of the joint. If the total joint deflection
due to initial installation and the movement of the pipeline during system
operation exceeds the published maximum allowable movement of the
expansion joint, then the pipeline should be altered to reduce the initial
installation deflections. Alternately the pipe may be anchored in some
approved manner to limit the pipe movements to what the expansion
joint can absorb.
2. Flange face lubricant. Apply in thin film of graphite dispersed in glycerin
or water to the face of the rubber flanges before installing the
expansion joint. This is a type of lubricant that may be used on rubber
flanges. Its purpose is to simplify installation and to permit easy removal
at some future date (not required for TFE or FEP lined joints).
3. Mating flanges. Install the expansion joint against the mating pipe
flanges and install bolts so that the bolt head and washer are against the
retaining rings. If washers are not used, flange leakage can result –
particularly at the split in the retaining rings. Flange-to-flange dimensions
of the expansion joint must match the breech type.
4. Bolting. Insert bolt from the arch side of the flange. Tighten bolts by
alternating around the flange and tighten all bolts equally. The bolts are
not considered tight until the edge of the expansion joint flange bulges
slightly. Check bolt tightness at least one week after going onstream and
Special precautions
1. Flangeless valves. Never install spool-type rubber expansion joints next to flangeless butterfly valves or flangeless check valves. Serious damage to the
rubber joint can occur unless it is installed against full-face metal flanges.
2. Undue stress. Do not install an expansion joint in a system in an attempt to "pull" misaligned piping into position.
3. Retaining rings. Never install spool-type expansion joints without using the back-up retaining rings behind both flanges.
4. Control units. Install control units with a Thorburn rubber expansion joint if piping is not adequately anchored or if there is any question that movements
may exceed the rated value of the joint.
5. A spare. At the time of installation, consider ordering a spare joint. Although Thorburn expansion joints are engineered to give long, dependable service,
the cost of equipment downtime in the event a joint wears out can far outweigh the cost of a spare.
Warning
Page 30
periodically thereafter. As any rubber-like material takes a set after a
period of compression, the bolts may loosen and result in a break in the
seal. It is particularly important to check bolts in a hot and cold water
system before changing over from one medium to the other.
5. Tightening bolts. Tighten bolts in stages by alternating around the
flange. If the joint has integral fabric and rubber flanges, the bolts should
be tight enough to make the rubber flange O.D. bulge between the
retaining rings and the mating flange. Torque bolts sufficiently to assure
leak-free operation at hydrostatic test pressure. If the joint has metal
flanges, tighten bolts only enough to achieve a seal and never tighten
to the point that there is metal-to-metal contact between the joint flange
and the mating flange.
6. Inspect cover for any accidental cuts or gouges. The protective
cover should be repaired with rubber cement prior to system start-up.
7. Outdoor installation. If the expansion joint will be installed outdoors,
make sure the cover material will withstand ozone, sunlight, etc. Materials
such as neoprene and chlorobutyl are recommended. Materials
painted with weather resistant paint will give additional ozone and sunlight
protection.
8. Re-tighten bolts after seven days of operation and periodically thereafter.
Rubber parts will take a set after a period of compression. Loosening
of the bolts and breakage of the seal may occur if this procedure
is not followed.
The purpose of this publication is to provide a handy reference source of pertinent information for the thousands of engineers whose daily concern is
designing piping systems and overseeing installations. No portion of this publication attempts to establish dictates in modern piping design.
Thorburn makes no warranty concerning the information or any statement set forth in this publication, and both expressly disclaim any liability for
incidental and consequential damages rising out of damage to equipment, injury to persons or products, or any harmful consequences resulting from
the use of the information or reliance on any statement set forth in this publication.

THORBURN THE FLEXIBLE PIPING SPECIALIST
INSTALLATION INSTRUCTIONS FOR THORBURN’S
NON-METALLIC PIPE CONNECTORS AND EXPANSION JOINTS
1. Pre-installation checklist
1.1 Compare the requirements of the system to ensure the proper number of control
rods have been specified (Minimum of two required).
1.2 Check units to be sure all parts are included. The unit consists of two control
rod plates, one bolt with two nuts and two metal spherical washers or flat
washers.
2. Control rod installation tips
2.1 Assemble Thorburn expansion joint between pipe flanges to the manufactured
face to face length of the expansion joint. Include the retaining rings furnished
with the expansion joint.
2.2 Assemble control rod plates behind mating pipe flanges. Flange bolts through
the control rod plate must be longer to accommodate the plate. Control rod
plates should be equally spaced around the flange. Depending upon the size
and pressure rating of the system, 2, 3 or more control rods may be required.
2.3 Insert control rods through top plate holes. Steel washers are to be positioned
at the outer plate surface. An optional rubber washer is positioned between the
steel washer and the outer plate surface. For spherical washer installation please
see pages 25 to 27.
2.4 If a single nut per unit is furnished, position this nut so that there is a gap
between the nut and the steel washer. This gap is equal to the joint’s maximum
extension (commencing with the nominal face to face length). To lock this nut in
position, either “stake” the thread in two places or tack weld the nut to the rod.
If two jam nuts are furnished for each unit, tighten the two nuts together, so as
Inspection procedure for expansion joints in service
The following suggestions are intended to assist the designer in determining if
Thorburn’s expansion joint should be replaced or repaired after extended service.
A. Replacement criteria
If an expansion joint is in a critical service condition and is five or more years old,
consideration should be given to maintaining a spare or replacing the unit at a
scheduled outage. If the service is not of a critical nature, observe the expansion
joint on a regular basis and plan to replace after 10 years service. Applications
vary and life can be as long as 30 years in some cases.
B. Procedures
B-1 Craking. Craking, checking or crazing may not be serious if only the outer cover
is involved and the fabric is not exposed. If necessary, repair on site with rubber
cement where cracks are minor. Cracking where the fabric is exposed and torn
indicates the expansion joint should be replaced. Such cracking is usually the
result of excessive extension, angular or lateral movements. Such cracking is
identified by: 1) a flattening of the arch; 2) cracks at the base of the arch and/or
3) cracks at the base of the flange. To avoid future problems, replacement
expansion joints should be ordered with Thorburn control rod units.
B-2 Blisters/Deformation/Ply separation. Some blisters or deformations, when on
the external portions of Thorburn’s expansion joints may not affect the proper
performance of the expansion joints. These blisters or deformations are cosmetic
in nature and do not require repair. If major blisters, deformations and/or ply
separations exist in the tube, the expansion joint should be replaced as soon as
possible. Ply separation at the flange O.D. can sometimes be observed and is
not a cause for replacement of the expansion joint.
CONTROL ROD INSTALLATION
Page 31
to achieve a “jamming” effect to prevent loosening. Consult Thorburn if there
is any question as to the rated compression and elongation. These two
dimensions are critical in setting the nuts and sizing the compression pipe
sleeves.
2.5 If there is a requirement for compression pipe sleeves, contact Thorburn to
determine length to allow Thorburn joint to be compressed to its normal limit.
2.6 For Thorburn reducer joint installation, it is recommended that all control rod
installations be parallel to the piping.
2.7 The expansion joint should always be installed in an accessible location to
allow for future inspection or replacement.
3 Installation
3.1 Bolt the control rod plates to the opposite side of the metal flange at the
same time the bolt is being installed through the rubber flange. The plates
are to be equally spaced around the circumference of the flange.
3.2 Install the bolt through the third hole in each control rod plate after placing a
metal flat washer or spherical washer set next to the bolt head.
3.3 Install the locking nuts after placing the flat or spherical washer half on the
control thread, the first nut on the rod then the second.
3.4 Positioning control rod unit. The control rod assembly is set at the maximum
allowable expansion and/or contraction of the joint.
3.5 Repeat steps 3.1 to 3.4 for each control rod unit.
B-3 Metal reinforcement. If the metal reinforcement of a Thorburn expansion joint
is visible through the cover, the expansion joint should be replaced as soon as
possible.
B-4 Dimensions. Any inspections should verify that the installation is correct; that
there is no excessive misalignment between the flanges and that the installed
face-to-face dimension is correct. Check for over-elongation, over-compression,
lateral or angular misalignment. If incorrect installation has caused the expansion
joint to fail, adjust the piping and order a new expansion joint to fit the existing
installation.
B-5 Rubber deterioration. If the joint feels soft or gummy, plan to replace the
expansion joint as soon as possible.
B-6 Leakage. If leakage or weeping is occuring from any surface of Thorburn’s
expansion joint, except where flanges meet, replace the joint immediately. If
leakage occurs between the mating flange and the expansion joint flange, tighten
all bolts. If this is not successful, turn off the system pressure, loosen all flange
bolts and then re-tighten bolts in stages by alternating around the flange. Make
sure there are washers under the bolt heads, particularly at the split in the
retaining rings. Remove the expansion joint and inspect both rubber flanges
and pipe mating flange faces for damage and surface condition. Repair or replace
as required. Also, make sure the expansion joint is not over-elongated as this
can tend to pull the joint flange away from the mating flange resulting in leakage.
If leakage persists, consult the manufacturer for additional recommendations.

THORBURN THE FLEXIBLE PIPING SPECIALIST
MISCELLANEOUS MOVEMENTS PRESSURES FLOWING MEDIUM SIZE COMPANY
THORBURN’S PIPE CONNECTORS AND EXPANSION JOINTS
TECHNICAL SPECIFICATION SHEET
DATE SHEET NO
COMPANY NAME PROJECT NAME
MAILING ADDRESS INQUIRY/JOB NUMBER
CITY/PROVINCE(STATE)/COUNTRY/POSTAL CODE(ZIP) ITEM NO. TAG NO. ITEM NO. TAG NO. ITEM NO. TAG NO.
NAME OF PERSON SUBMITTING DATA PHONE NO QUANTITY REQUIRED QUANTITY REQUIRED QUANTITY REQUIRED
PIPE SIZE OF APPLICATION:
Nominal pipe size or the inside diameter of the connecting pipe flange.
INSTALLED LENGTH:
What is the space between connecting pipe flanges. Indicate limitations, if any.
FLOWING MEDIUM:
Indicate chemical. If flowing medium is corrosive, abrasive or viscous, explain in detail.
TYPE OF MEDIUM:
Indicate if liquid, gas, slurry, solids, etc.
TEMPERATURE OF FLOWING MEDIUM:
Indicate both operating and maximum temperatures at the expansion joint.
TEMPERATURE OF SURROUNDING ATMOSPHERE:
Indicate both minimum and maximum temperatures of atmosphere at the expansion joint.
TIME DURATION AT MAXIMUM TEMPERATURE:
Indicate length of time.
VELOCITY OF FLOWING MEDIUM:
In feet per minute.
OPERATING PRESSURE AT THE JOINT:
Actual pressure in which system works in normal conditions.
DESIGN PRESSURE OF THE SYSTEM:
Highest/most severe pressure expected during operation.
SURGE PRESSURE OF THE SYSTEM:
Increased pressure due to pump starts, valve closings, etc.
TEST PRESSURE OF THE SYSTEM:
Hydrostatic test used to demonstrate system capability.
TYPE OF PRESSURE:
Constant, intermittent, shock, pulsating, etc.
AXIAL COMPRESSION AT JOINT:
In inches as a result of pipe extension - expansion (for milimeters, specify mm).
ACTUAL ELONGATION AT JOINT:
In inches as a result of pipe contraction (for milimeters, specify mm).
LATERAL DEFLECTION AT JOINT:
In inches (for milimeters, specify mm).
ANGULAR MOVEMENT AT JOINT:
In degrees (for milimeters, specify mm).
TORSIONAL MOVEMENT AT JOINT:
In degrees (for milimeters, specify mm).
PIPE FLANGE DRILLING:
Indicate specific standards such as 150# ANSI B16.5. If special, provide: Flange O.D.,
bolt, circle, number and size of holes.
MATING PIPE FLANGE THICKNESS:
In inches.
LOCATION OF JOINT INSTALLATION:
Indoors or outdoors, vertical or horizontal.
RETAINING RINGS:
Are required on all installations. Reusable, they need not be ordered with replacement or
spare expansion joints.
CONTROL UNIT ASSEMBLIES:
Are recommended for use in all expansion joint applications. Control units must be used
when piping support or anchoring is insufficient.
Page 32
INCHES INCHES INCHES
INCHES INCHES INCHES
OPERATE MAXIMUM OPERATE MAXIMUM OPERATE MAXIMUM
F F F F F F
MINIMUM MAXIMUM MINIMUM MAXIMUM MINIMUM MAXIMUM
F F F F F F
FT./MIN. FT./MIN. FT./MIN.
POSITIVE NEGATIVE POSITIVE NEGATIVE POSITIVE NEGATIVE
PSIG “Hg PSIG “Hg PSIG “Hg
POSITIVE NEGATIVE POSITIVE NEGATIVE POSITIVE NEGATIVE
PSIG “Hg PSIG “Hg PSIG “Hg
POSITIVE NEGATIVE POSITIVE NEGATIVE POSITIVE NEGATIVE
PSIG “Hg PSIG “Hg PSIG “Hg
POSITIVE NEGATIVE POSITIVE NEGATIVE POSITIVE NEGATIVE
PSIG “Hg PSIG “Hg PSIG “Hg
INCHES INCHES INCHES
INCHES INCHES INCHES
INCHES INCHES INCHES
DEGREES DEGREES DEGREES
DEGREES DEGREES DEGREES
SPECIFICATION SPECIFICATION SPECIFICATION
INCHES INCHES INCHES
YES OR NO YES OR NO YES OR NO
YES OR NO YES OR NO YES OR NO

THORBURN THE FLEXIBLE PIPING SPECIALIST
HOW TO ORDER THORBURN CUSTOM RUBBER PIPE EXPANSION
JOINTS WITH RETAINING RINGS AND CONTROL ROD UNITS
42HP 6 X 12 T O F C R S6 C R 2 S6
Model Type Size Arches # Arch Type Material Ret. Ring/ Control Rod & # Accessories
IDXLength “F” Tube Cover Material Material
ID1, ID2*-FF
* if applicable
N = No arch
S = Single
D = Double
T = Triple
Q = Quadruple
For arches
greater than 4,
specify as
follows:
5A, 6A, 7A...
F = Filled
O = Open
HAND BUILT EXPANSION JOINT STYLES PAGES
Round Spool Type Arch Flanged
35LP = Low pressure ...................................................... 13 to 17
50SP = Standard Pressure ............................................. 13 to 17
42HP = High pressure .................................................... 13 to 17
42HPX = Extra high pressure ......................................... 13 to 17
42HPX-HD = Extra high pressure deep sea water
service where exterior pressure differential is present ............ 67
Spool Type Arch Flanged Reducer
42HP-CR = High pressure concentric reducer ................... 18,19
42HP-ER = High pressure eccentric reducer ..................... 18,19
42HP-CRX = Extra high pressure concentric reducer ....... 18,19
42HP-ERX = Extra high pressure eccentric reducer .......... 18,19
Low Pressure Sleeve Type
30DB = Cuff sleeve by cuff sleeve .......................................... 20
25DB = Flanged by sleeve ...................................................... 20
Rectangular/Round Moulded Flanged Ducting Expansion Joints
15RA = Round low pressure arch type < 25 psi ...................... 21
15R = Round low pressure no arch < 25 psi ........................... 21
15RRLP = Low pressure less ± 3 psi rectangular ................... 22
15RLP = Low pressure ± 3 psi round ...................................... 22
Specials
42HPO = Offset ....................................................................... 21
42HPEF = Enlarged flange type .............................................. 21
TCT = Bootflex convoluted tubing/protective covers ............... 23
Page 33
A = Natural rubber
B = Pure gum
C = Neoprene
D = Nitrile
E = Butyl
F = Hypalon
G = Cross/Link
Polyethylene
H = EPDM
I = Viton
J = Teflon PTFE
K = Teflon PFA
L = Silicone
X = Special
Split metal
retaining
ring
Carcass
metal
reinforcing
Carcass fabric
reinforcing
Expansion
joint flange
R = Rings
Blank = None
Tube
Mating
flange
Blank = None
CR = Yes
Standard material is plated steel.
For other material insert following
suffix after code.
304SS = S4
316SS = S6
6MO = 6MO
Monel = M
Others = O and specify
Blank: - No accessory
SW = Spherical washers
PS - Control rod assembly
with compression
movement restricting
pipe sleeves
X= Other, specify
EXAMPLE: Verbally interpreted Thorburn Model 42HP 6” ID by 12”
Length, triple arch, open design, Hypalon tube, Neoprene cover, with
316SS retaining rings and 2 rod control units in 316SS.
NOTES
1) For millimeter sizing, round off to nearest inch
size for part # and specify milimeter sizing
2) For anything not listed, put “X” at the end of
the part number and specify
3) If flange drilling different than ANSI B16.1
Class 125, specify
4) If mating flange different than ANSI B16.5 or
AWWA L207 Table 3 Class E, specify
Cover
Control
rod
Accessories

THORBURN THE FLEXIBLE PIPING SPECIALIST
Twice the movement in a compact design
Thorburn’s model TM20 has twice the movement capabilities
with all the advantages and none of the disadvantages
found in the spherical and spool type designs, Thorburn is
proud to introduce its new and improved model TM20 extra
wide arch double movement expansion joints, combining
the best features found in the spherical and the traditional
spool arch designs, making an expansion joint system that
will outperform them both.
Thorburn’s TM20 advantages
■ Greater movements: The TM20 utilizes the spherical long
flowing arch for twice the movements, when compared to the
narrow high arch of the spool-type design. Self flushing, TM20 is
great for slurries and reduces turbulence; eliminating the need for
a filled arch.
■ Easier sealing: The TM20 design utilizes the full-faced rubber/
fabric flange of the spool-type joint for a quick and sure seal at the
flange when compared to the small lip seal of the spherical design.
■ Less cost: Thorburn’s TM20 has a moulded composite design and
as such has a lower cost than our traditional mighty spool handbuilt
joints.
How to Order Thorburn TM20 Joints
Model # Size (in.) Material Codes Rings Control
Number ID x Tube Cover R= Rings Rod
Length Blank = None Number
TM20 16x8 D C R CR2
Note: To order special materials, lengths, multitube, filled arches, see
Mighty-Spool ordering system on page 33 for details.
TM20 EXTRA WIDE ARCH
Page 34
NEW AND
IMPROVED
Extra wide arch
TM20
Steel
Retaining
Ring
Traditional
Narrow Spool
Arch
Typical Thorburn TM20 market applications
■ Pulp and paper white water piping systems
■ Waste water and sewage treatment plants
■ Shipboard marine piping
■ Air conditioning and ventilating systems
Thorburn TM20 elastomeric ordering codes
Type of Elastomer (1) Maximum
Rubber operating
codes Tube Cover Temp. (F.)
EE Butyl Butyl 250º
HH EPDM EPDM 250º
FC Hypalon Neoprene 212º
CC Neoprene Neoprene 225º
DC Nitrile Neoprene 225º
Steel
Retaining
Ring
(1): Other elastomers available in hand-built design. Call Thorburn with
your specific requirement at 1-800-363-6613 or fax at 514-695-8716.

THORBURN THE FLEXIBLE PIPING SPECIALIST
EXTRA WIDE ARCH MODEL TM20 SPECIFICATIONS
Expansion joint flange
dimensions
Expansion joint size
I.D. x Length
(in.)
(8)
1 x 6
1.25 x 6
1.50 x 6
2 x 6
2.5 x 6
3 x 6
3.5 x 6
4 x 6
5 x 6
6 x 6
8 x 6
8 x 8
10 x 8
12 x 8
14 x 8
16 x 8
18 x 8
20 x 8
22 x 10
24 x 10
26 x 10
28 x 10
30 x 10
36 x 10
Maximum
total travel of
installed joint
Minimum Length
Compressed
Maximum Length
Extended
5.05 - 6.36
5.05 - 6.36
5.05 - 6.36
4.94 - 6.47
4.94 - 6.47
4.94 - 6.47
4.94 - 6.47
4.94 - 6.47
4.94 - 6.53
4.94 - 6.59
4.94 - 6.59
6.94 - 8.59
6.35 - 8.71
6.35 - 8.77
6.35 - 8.77
6.35 - 8.83
6.35 - 8.83
6.35 - 8.83
8.35 -10.83
8.03 -10.83
8.03 -11.00
8.03 -11.00
8.03 -11.00
8.03 -11.00
.95
.95
.95
1.06
1.06
1.06
1.06
1.06
1.06
1.06
1.06
1.06
1.65
1.65
1.65
1.65
1.65
1.65
1.65
1.97
1.97
1.97
1.97
1.97
Extra wide arch Thorburn
Model TM20
.36
.36
.36
.47
.47
.47
.47
.47
.53
.59
.59
.59
.71
.77
.77
.83
.83
.83
.83
.83
1.00
1.00
1.00
1.00
.44
.44
.44
.59
.59
.59
.59
.59
.66
.74
.74
.74
.89
.96
.96
1.03
1.03
1.03
1.03
1.03
1.13
1.13
1.13
1.13
35.8 o
29.9 o
25.7 o
25.2 o
20.6 o
17.4 o
15.1 o
13.2 o
12.0 o
11.1 o
8.4 o
8.4 o
8.1 o
7.3 o
6.3 o
5.9 o
5.3 o
4.8 o
4.3 o
3.9 o
4.4 o
4.1 o
3.8 o
3.2 o
3 o
3 o
3 o
3 o
3 o
3 o
3 o
3 o
3 o
3 o
3 o
3 o
3 o
3 o
2 o
2 o
1 o
1 o
1 o
1 o
1 o
1 o
1 o
1 o
Thorburn TM20
Retaining ring
(7)
Non-Concurrent Movement Capability: From
Neutral Position
Inches of Axial
Compression
Inches of Axial
Extension
± Inches of Lateral
Deflection
± Angular
Deflection
(1)
Degrees of
Torsional mov’t
(2)
Thrust
Factor
3.74
4.64
5.65
10.04
13.04
16.43
20.23
24.41
36.01
49.87
78.05
78.05
120.03
166.48
215.36
276.29
338.36
407.70
481.33
562.25
649.45
742.93
904.56
1252.68
Page 35
Control Rod Bolt Circle
Flange/Retaining Ring O.D.
Bolt Circle
Control
Rod
Plate Retaining
Ring
Optional
Compression Sleeve
Rubber
Washer
Steel
Washer
Standard
Pipe
Flange
TM20 expansion joint assembly with
control rod unit
(1) The amount of angular movement is based on the maximum allowable extension movement from neutral. Angular movement can be increased if it is in
conjunction with compression movement.
(2) Torsional movement is expressed when the expansion joint is at neutral length.
(3) To determine end thrust: multiply thrust factor by operating pressure of system. This total is end thrust in PSIG.
(4) Pressure rating is based on 180 o F operating temperature. At higher temperatures, the pressure rating is slightly reduced. Minimum burst pressure is 4:1.
(5) Dimensions shown are in accordance with 125/150# standards of: ANSI B-16.1, B-16.24, B-16.5; AWWA C-207 Table 1 and 2 Class D. Other dimensions
and drilling available upon request.
(6) Higher positive and negative pressure ratings available upon request. (7) Special hand-built multi-extrawide arch for greater movement available upon
request.
(8) Larger sizes, off sizes available upon request.
(3)
Standard (6)
Operating
Pressure
Positive
Pressure PSIG
(4)
220
220
220
200
200
200
200
200
200
200
180
180
150
150
130
110
110
110
100
100
90
90
90
80
Negative Vacuum
In. of hg
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
26
Weights
in Pounds
Expansion
Joint
1.6
1.6
1.8
2.8
3.1
4.3
5.3
6.3
6.5
8.0
10.8
14.4
18.5
25.0
26.8
34.3
37.4
45.6
57.5
61.8
68.8
75.8
83.0
125.0
Retaining Ring
Set (2 rings)
1.8
2.3
2.3
3.1
4.5
4.9
6.3
6.4
7.3
7.9
12.1
12.1
14.8
21.8
23.8
27.9
29.5
32.8
34.0
42.4
44.5
55.0
57.3
79.3
O.D. of Exp.
Joint/Ret. rings
4.25
4.625
5.0
6.0
7.0
7.5
8.5
9.0
10.0
11.0
13.5
13.5
16.0
19.0
21.0
23.5
25.0
27.5
29.5
32.0
34.25
36.5
38.75
46.0
Bolt Circle
3.125
3.5
3.875
4.75
5.5
6.0
7.0
7.5
8.5
9.5
11.75
11.75
14.25
17.0
18.75
21.25
22.75
25.0
27.25
29.5
31.75
34.0
36.0
42.75
Number of
Holes
4
4
4
4
4
4
8
8
8
8
8
8
12
12
12
16
16
20
20
20
24
28
28
32
Nominal
Pipe Size
Joint I.D.
(5)
Flange Dimensions and Drilling
Size of Holes
.625
.625
.625
.75
.75
.75
.75
.75
.875
.875
.875
.875
1.0
1.0
1.125
1.125
1.25
1.25
1.375
1.375
1.375
1.375
1.375
1.625

THORBURN THE FLEXIBLE PIPING SPECIALIST
PRECISION MOULDED EASY-FLEX SPHERICAL ARCH
EXPANSION JOINT SERIES 101 (single sphere flanged),
102 (twin sphere female union coupling)
AND 201 (twin sphere flanged)
Thorburn is proud to introduce its precision engineered
moulded spherical arch expansion joint system. Utilizing
technology from the tire moulding industry, Thorburn’s
spherical arch expansion joints are manufactured with
multiple plies of tire cord fabric encapsulated with
synthetic rubber and moulded in a hydraulic rubber
press under minimum moulding pressures of 1000 psi.
The moulds are held between heated platens so
vulcanization takes place right on the press.
The materials that are used become fused into an
inseparable homogenous mould. The result allows for
Thorburn’s spherical expansion joints to be constructed
with a lighter wall, achieving higher pressure ratings, a
lower deflection force, providing greater flexibility and
movement absorption.
This advanced technology has revolutionized the expansion
joint industry and positioned Thorburn as a
premium world supplier.
Typical Thorburn single sphere style 101 expansion joint installation
Page 36
APPLICATIONS
■ Cold and hot water supply ■ Liquid waste treatment plant
■ Sea water
■ Drainage system
■ Pump pressure lines ■ Oil and chemical lines
■ Compressed air and vacuum line
Easy-Flex Provides Strength and Flexibility
Thorburn’s Easy-Flex superior design is inherently
stronger than traditional spool type arch design.
Pressure is exerted evenly in all directions and so
distributes these forces evenly over a large area.
The streamed line long flowing arch reduces
turbulence and allows smooth quiet flow.
Thorburn’s Easy-Flex spherical “long flowing”
arch design cannot build up. Therefore there is no
need to fill the arch and thus restrict its movements. Typical Thorburn twin sphere style 201 expansion joint installation

THORBURN THE FLEXIBLE PIPING SPECIALIST
EASY-FLEX SPHERICAL LONG FLOW ARCH SUPERIOR
EXPANSION JOINT SYSTEM
Control Rod Plate Max. OD
Control Rod Plate
Control Rod
Bolt Circle
EASY-FLEX MOULDED
SPHERICAL DESIGN
WITH LONG FLOW ARCH
Steel Washer
Retaining Flanges
Optional
Compression Sleeve
Advantages to consider when
specifying Thorburn’s “Easy-Flex”
spherical expansion joint system
Less system strain
Thorburn’s Easy-Flex spherical expansion joint
requires less “force to deflect”, reducing piping
flange equipment stress-strain-damage.
Absorbs vibration noise shock
Thorburn’s Easy-Flex spherical expansion joint
system is an ideal replacement for sound transmitting
metallic expansion joints. Sound loses
energy travelling axially through the rubber
bellows; water hammer, pumping impulses and
water-born noises are absorbed by the moulded
lightweight thin wall structure.
Simplify installation with floating flanges
Thorburn’s Easy-Flex are designed with floating
flanges permitting easy mating flange bolt hole
alignment. Thorburn’s easy-flex flanges are
furnished complete with carbon steel plate
flanges, plated to prevent corrosion and drilled
to ANSI 150# standards. Other drilling standards
such as ANSI 250/300#, British standard 10,
DIN and JIS are readily available.
Rubber
Washer
Standard
Pipe
Flange
Page 37
TRADITIONAL HAND-BUILT SPOOL ARCH
DESIGN WITH NARROW HIGH ARCH
Control Rod Bolt Circle
Flange/Retaining Ring O.D.
Bolt Circle
Control
Rod
Plate Retaining
Ring
Optional
Compression Sleeve
Steel
Washer
Standard
Pipe
Flange
Nominal
Pipe Size
Joint I.D.
Control Rod Unit applications
Thorburn control rod unit assemblies are factory preset at the maximum allowable
expansion and/or contraction of the connector. They are designed to absorb
static pressure thrust developed at the expansion joint. When used in this manner,
control unit assemblies are an additional safety factor, minimizing possible
failure of the expansion joint or damage to the equipment.
1. Anchored systems: Thorburn control unit assemblies are not required in
piping systems that are anchored on both sides of the expansion joint,
provided piping movements are within the rated movements and pressure is
less than shown below.
2. Unanchored systems: Thorburn control unit assemblies are always recommended
in unanchored systems. Additionally, control unit assemblies must
be used when the maximum pressure exceeds the limit shown or the
movement exceeds the rated movement.
3. Spring mounted equipment: Thorburn control unit assemblies are always
recommended for spring mounted equipment.
WARNING: Control units must be installed when pressures (test design surge
operating) exceed rating below or piping system is unanchored.
Pipe Size Single Sphere Style 101 Twin Sphere Style 201
1” thru 4” 180 135
5” thru 10” 135 135
12” thru 14” 90 90
16” thru 24” 45 45
26” thru 30” 35 35

THORBURN THE FLEXIBLE PIPING SPECIALIST
EASY-FLEX STYLE 101
MOULDED SINGLE SPHERE EXPANSION JOINT SYSTEM
Higher Pressure and
Full Vacuum Joints
Available Upon
Request
Call Thorburn Now!
Thorburn
Part
Number
“A” Nominal Pipe ID
XX: Specify rubber code
HOW TO ORDER
Model # Size in Material codes Control rod
ID x Length Tube Cover number
101 2x6 D C CR2
THORBURN MODEL 101, 2” I.D. X 6” LONG, NITRILE
TUBE, NEOPRENE COVER, TWO CONTROL ROD UNITS.
Size Movement Pressure Weights
Non-Concurrent 82ºC/180ºF
“F” Neutral Length
Axial Compression (in.)
Axial Extension (in.)
Lateral Deflection
(in.±)
Angular Deflection
(degrees ±)
Positive PSI
Negative in. of Hg
Joint & Flanges
Approx. lbs.
Page 38
Thorburn Tube Cover Maximum
Code XX Operating Temp ºF
EE Butyl Butyl 225º
HH EPDM EPDM 250º
FC Hypalon Neoprene 212º
CC Neoprene Neoprene 225º
DC Nitrile Neoprene 212º
Control Unit & Rod
Set Approx. lbs
101-1-6-XX 1.00 6 0.50 0.38 0.50 15º 225 15” 3.8 3.3
101-1.25-6-XX 1.25 6 0.50 0.38 0.50 15º 225 15” 5 3.3
101-1.5-6-XX 1.50 6 0.50 0.38 0.50 15º 225 15” 6.1 4.6
101-2-6-XX 2.00 6 0.50 0.38 0.50 15º 225 15” 8.9 6.6
101-2.5-6-XX 2.50 6 0.50 0.38 0.50 15º 225 15” 12.3 7.6
101-3-6-XX 3.00 6 0.50 0.38 0.50 15º 225 15” 14 8.3
101-3.5-6-XX 3.50 6 0.50 0.38 0.50 15º 225 15” 17.6 7.4
101-4-6-XX 4.00 6 0.75 0.50 0.50 15º 225 15” 18.3 7.4
101-5-6-XX 5.00 6 0.75 0.50 0.50 15º 225 15” 22.8 8.3
101-6-6-XX 6.00 6 0.75 0.50 0.50 15º 225 15” 26.8 10.4
101-8-6-XX 8.00 6 0.75 0.50 0.50 15º 225 15” 40.6 13.4
101-10-8-XX 10.00 8 1.00 0.625 0.75 15º 225 15” 56.6 21.3
101-12-8-XX 12.00 8 1.00 0.625 0.75 15º 225 15” 83 27
101-14-8-XX 14.00 8 1.00 0.625 0.75 15º 150 15” 115 28
101-16-8-XX 16.00 8 1.00 0.625 0.75 15º 125 15” 165 26.8
101-18-8-XX 18.00 8 1.00 0.625 0.75 15º 125 15” 168 31.4
101-20-8-XX 20.00 8 1.00 0.625 0.75 15º 125 15” 170 32.4
101-22-10-XX 22.00 10 1.00 0.625 0.75 15º 115 15” 210 34.5
101-24-10-XX 24.00 10 1.00 0.625 0.75 15º 110 15” 255 45.5
101-26-10-XX 26.00 10 1.00 0.625 0.75 10º 110 15” 305 46.5
101-28-10-XX 28.00 10 1.00 0.625 0.75 10º 110 15” 360 51.5
101-30-10-XX 30.00 10 1.00 0.625 0.75 10º 110 15” 405 57
4
2
F
1B
1A
3
Aø
Item # Part
Construction
Materials
1A Tube Rubber
1B Cover Rubber
2 Reinforcement Nylon tire cord
3 Wire Hard spring steel wire
4 Flange Mild steel galvanized, various
drilling and materials available
WARNING: Control units must be installed when
pressures (test design surge operating) exceed rating
below or piping system is unanchored.
Pipe Size Single Sphere Style 101
1” thru 4” 180
5” thru 10” 135
12” thru 14” 90
16” thru 24” 45
26” thru 30” 35
FOR CONTROL ROD UNITS, SEE PAGES 26 TO 28
Note 1: Pressure rating is based on 180ºF operating temperature.
At higher temperatures the pressure rating is reduced.
Contact Thorburn for details.
Note 2: Pressures shown are recommended “operating”. Test
pressure is 1.5 times “operating”. Burst pressure is approximate
4 times “operating”.
Note 3: Vacuum rating is based on neutral installed length,
without external load. Products should not be installed “extended”
on vacuum applications.
Note 4: All expansion joints are furnished complete with
floating flanges. Drilling meets 125/150 lb. standards of ANSI
B16.1, B16.24, B16.5; AWWA C207 Class D & F; MSS-SP44
& 51. For other drilling see page 35. Control units are available
on special order. Add suffix CR2 or CR3, depending on the
number of rods required.
Note 5: All dimensions are in inches. All weights are in pounds.
Note 6: XX = Elastomer tube/cover type, please specify.
Note 7: To specify style 101 for full vacuum 26” Hg specify
prefix HD.

THORBURN THE FLEXIBLE PIPING SPECIALIST
EASY-FLEX STYLE 201
MOULDED TWIN SPHERE EXPANSION JOINT SYSTEM
Available size up to 30”!
HOW TO ORDER
Model # Size in Material codes Control rod
ID x Length Tube Cover number
201 4x9 D C CR2
THORBURN MODEL 201, 4” I.D. X 9” LONG, NITRILE TUBE,
NEOPRENE COVER, TWO CONTROL ROD UNITS.
FOR DETAILS ON CONTROL ROD UNITS, SEE PAGES 26 TO 28
Thorburn
Part
Number
Size Movement Pressure Weights
Non-Concurrent 82ºC/180ºF
“A” Nominal Pipe ID
“F” Neutral Length
Axial Compression (in.)
Axial Extension (in.)
XX = Elastomer tube/cover type, please specify.
Lateral Deflection
(in.±)
Angular Deflection
(degrees ±)
Positive PSI
Negative in. of Hg
Joint & Flanges
Approx. lbs.
Page 39
Item # Part
Construction
Materials
Control Unit & Rod
Set Approx. lbs
201-1.5-7-XX 1.5 7 2.00 1.25 1.50 40º 225 15” 6 4.0
201-2-7-XX 2.0 7 2.00 1.25 1.50 40º 225 15” 9 6.0
201-3-7-XX 3.0 7 2.00 1.25 1.50 40º 225 15” 15 7.5
201-4-9-XX 4.0 9 2.00 1.25 1.50 30º 225 15” 20 7.5
201-5-9-XX 5.0 9 2.00 1.25 1.50 30º 225 15” 25 8.0
201-6-9-XX 6.0 9 2.00 1.25 1.50 30º 225 15” 30 12.0
201-8-13-XX 8.0 13 2.25 1.25 1.38 30º 225 15” 45 15.0
201-10-13-XX 10.0 13 2.50 1.38 1.38 30º 225 15” 65 25.0
201-12-13-XX 12.0 13 2.50 1.38 1.38 30º 225 15” 95 27.0
201-14-13.75-XX 14.0 13.75 1.75 1.00 1.00 20º 150 15” 130 28.0
201-16-13.75-XX 16.0 13.75 1.75 1.00 1.00 20º 125 15” 170 29.0
201-18-13.75-XX 18.0 13.75 1.75 1.00 1.00 20º 125 15” 175 34.0
201-20-13.75-XX 20.0 13.75 1.75 1.00 1.00 20º 125 15” 180 35.0
201-24-13.75-XX 24.0 13.75 1.75 1.00 1.00 20º 110 15” 285 47.5
201-28-12-XX 28.0 12 1.75 1.00 1.00 20º 110 15” 375 52.7
201-30-12-XX 30.0 12 1.75 1.00 1.00 20º 110 15” 420 58.0
1A Tube Rubber
1B Cover Rubber
2 Reinforcement Nylon tire cord
3 Wire Hard spring steel wire
4 Flange Mild steel galvanized, various drilling
and materials available
5 Arch ring Ductile iron or carbon steel
Thorburn Tube Cover Maximum
Code XX Operating Temp ºF
EE Butyl Butyl 225º
HH EPDM EPDM 250º
FC Hypalon Neoprene 212º
CC Neoprene Neoprene 225º
DC Nitrile Neoprene 212º
WARNING:Control units must be installed
when pressures (test design surge
operating) exceed rating below or piping
system is unanchored.
Pipe Size Twin Sphere Style 201
1” thru 4” 135
5” thru 10” 135
12” thru 14” 90
16” thru 24” 45
26” thru 30” 35
Note 1: Pressure rating is based on 180ºF operating temperature.
At higher temperatures the pressure rating is reduced. Contact
Thorburn for details.
Note 2: Pressures shown are recommended “operating”. Test
pressure is 1.5 times “operating”. Burst pressure is approximate
4 times “operating”.
Note 3: Vacuum rating is based on neutral installed length,
without external load. Products should not be installed
“extended” on vacuum applications.
Note 4: All expansion joints are furnished complete with
floating flanges. Drilling meets 125/150 lb. standards of ANSI
B16.1, B16.24, B16.5; AWWA C207 Class D & F; MSS-
SP44 & 51. For other drilling see page 35. Control units are
available on special order. Add suffix CR2 or CR3, depending
on the number of rods required.
Note 5: All dimensions are in inches. All weights are in
pounds.
Note 6: To specify style 201 for full vacuum 26” Hg specify
suffix HD.

THORBURN THE FLEXIBLE PIPING SPECIALIST
Nominal
Pipe Size
In./mm. Flange
Thorburn
Series 101
American 250/300 #
Conforms to ANSI B16.1
and B16.5
Width
Flange
O.D.
Bolt
Circle
# Holes
Hole
Diameter
OPTIONAL
FLANGE
DRILLING
British Standard 10:1962
Conforms to B.S. 10 Table E
(Other tables on request)
Flange
Width
Flange
O.D.
Bolt
Circle
# Holes
Hole
Diameter
Page 40
Thorburn
Series 201
1 0.63 4.88 3.5 4 0.75 0.59 4.5 3.25 4 0.62 0.63 4.53 3.35 4 0.55 0.59 4.92 3.54 4 0.75
25 16 124 88.9 4 19.1 15 114 82.6 4 15.9 16 115 85 4 14 15 125 90 4 19
1.25 0.63 5.25 3.88 4 0.75 0.59 4.75 3.44 4 0.62 0.63 5.51 3.94 4 0.71 0.59 5.31 3.94 4 0.75
32 16 133 98.4 4 19.1 15 121 87.3 4 15.9 16 140 100 4 18 30 135 100 4 19
1.5 0.63 6.12 4.5 4 0.88 0.59 5.25 3.88 4 0.62 0.63 5.91 4.33 4 0.71 0.59 5.51 4.13 4 0.75
40 16 156 114.3 4 22.2 15 133 98.4 4 15.9 16 150 110 4 18 30 140 105 4 19
2 0.71 6.5 5 8 0.75 0.63 6 4.5 4 0.75 0.71 6.5 4.92 4 0.71 0.63 6.1 4.72 4 0.75
50 18 165 127 8 19.1 16 152.01 114.3 4 19.1 18 165 125 4 18 16 155 120 4 19
2.5 0.71 7.5 5.88 8 0.88 0.71 6.5 5 4 0.75 0.71 7.28 5.71 4 0.71 0.71 6.89 5.51 4 0.75
65 18 191 149.2 8 22.2 18 166 127 4 19.1 18 185 145 4 18 18 175 140 4 19
3 0.79 8.25 6.62 8 0.88 0.71 7.25 5.75 4 0.75 0.79 7.87 6.3 8 0.71 0.71 7.28 5.91 8 0.75
80 20 210 168.2 8 22.2 18 184 146.1 4 19.1 20 200 160 8 18 18 185 150 8 19
3.5 0.79 9 7.25 8 0.88 0.71 8 6.5 8 0.75 — — — — — 0.71 7.68 6.3 8 0.75
90 20 229 184.2 8 22.2 18 203 165.1 8 19.1 — — — — — 18 195 160 8 19
4 0.79 10 7.88 8 0.88 0.71 8.5 7 8 0.75 0.79 8.66 7.09 8 0.71 0.71 8.27 6.89 8 0.75
100 20 254 200 8 22.2 18 216 177.8 8 19.1 20 220 180 8 18 18 210 175 8 19
5 0.87 11 9.25 8 0.88 0.79 10 8.25 8 0.75 0.087 9.84 8.27 8 0.71 0.79 9.84 8.27 8 0.91
125 22 279 235 8 22.2 20 254 209.6 8 19.1 22 250 210 8 18 20 250 210 8 23
6 0.87 12.5 10.62 12 0.88 0.87 11 9.25 8 0.88 0.87 11.22 9.45 8 0.87 0.87 11.02 9.45 8 0.91
150 22 318 269.9 12 22.2 22 279 235 8 22.2 22 285 240 8 22 22 280 240 8 23
8 0.95 15 13 12 1 0.87 13.25 11.5 8 0.88 0.87 13.39 11.61 8 0.87 0.87 12.99 11.42 12 0.91
200 24 381 330.2 12 25.4 22 337 292.1 8 22.2 22 340 295 8 22 22 330 290 12 23
10 1.02 17.5 15.25 16 1.13 0.95 16 14 12 0.88 1.02 15.55 13.78 12 0.87 0.95 15.75 13.98 12 0.98
250 26 445 387.4 16 28.6 24 406 355.6 12 22.2 26 395 350 12 22 24 400 355 12 25
12 1.02 20.5 17.75 16 1.25 0.95 18 16 12 1 1.02 17.52 15.75 12 0.87 0.95 17.52 15.75 16 0.98
300 26 521 450.9 16 31.8 24 457 406.4 12 25.4 26 445 400 12 22 24 445 400 16 25
14 1.1 23 20.25 20 1.25 1.02 20.75 18.5 12 1 1.1 19.88 18.11 16 0.87 1.02 19.29 17.52 16 0.98
350 28 584 514.4 20 31.8 26 527 469.9 12 25.4 28 505 460 16 22 26 490 445 16 25
16 1.18 25.5 22.5 20 1.38 1.1 22.75 20.5 12 1 1.18 22.24 20.28 16 1.02 1.1 22.05 20.08 16 1.06
400 30 648 571.5 20 34.9 28 578 520.7 12 25.4 30 565 515 16 26 28 560 510 16 27
18 1.18 28 24.75 24 1.38 1.18 25.25 23 16 1 1.18 24.21 22.24 20 1.02 1.18 24.41 22.24 20 1.06
450 30 711 628.7 24 34.9 30 641 584.2 16 25.4 30 615 565 20 26 30 620 565 20 27
20 1.18 30.5 27 24 1.38 1.18 27.75 25.25 16 1 1.18 26.38 24.41 20 1.02 1.18 26.57 24.41 20 1.06
500 30 775 685.8 24 34.9 30 705 641.4 16 25.4 30 670 620 20 26 30 675 620 20 27
22 1.18 33 29.5 24 1.38 1.18 30 27.5 16 1.13 1.18 38.74 26.57 20 1.18 1.18 29.33 26.77 20 1.3
550 30 838 743 24 34.9 30 762 698.5 16 28.6 30 730 675 20 30 30 745 680 20 33
24 1.18 36 32 24 1.62 1.18 32.5 29.75 16 1.25 1.18 30.71 28.54 20 1.18 1.18 31.3 28.74 24 1.3
600 30 914 812.8 24 41.3 30 826 755.7 16 31.8 30 780 725 20 30 30 795 730 24 33
26 1.26 38.25 34.5 28 1.75 — — — — — 1.26 32.87 30.75 24 1.18 1.26 33.27 30.71 24 1.3
650 32 972 876 28 44.5 — — — — — 32 835 780 24 30 32 845 780 24 33
28 1.26 40.75 37 28 1.75 — — — — — 1.26 32.24 33.07 24 1.18 1.26 35.63 33.07 24 1.3
700 32 1035 940 28 44.5 — — — — — 32 895 840 24 30 32 905 840 24 33
30 1.26 43 39.25 28 2 1.26 39.25 36.5 20 1.38 1.26 37.99 35.43 24 1.3 1.26 38.19 35.43 24 1.3
750 32 1092 997 28 50.8 32 997 927.1 20 34.9 32 965 900 24 33 32 970 900 24 33
Flange
Width
Metric Series
Conforms to ISO 2084-1974
Table NP-10
(Holes to ISO/R-273)
Flange
O.D.
Bolt
Circle
# Holes
Hole
Diameter
J.I.S. Standard B-2212
Conforms to J.I.S. 10KG/CM
Flange
Width
Flange
O.D.
Bolt
Circle
# Holes
Hole
Diameter

THORBURN THE FLEXIBLE PIPING SPECIALIST
EASY-FLEX STYLE 102/102-HP
TWIN-SPHERE FEMALE METAL THREADED
UNION RUBBER CONNECTORS
■ Easy to install
■ Absorbs pipe wall and fluid borne noise
■ Reduces system stress and strain / Compensates for misalignment
■ Prevents electrolysis and electrolytic corrosion
■ Isolates vibration and motion
Easy-Flex Style 102 with screwed on female unions
Available Metal Materials
Suff. Codes to
Style Number for Materials Selections
Screw On Female Unions Flanges
Unions
Standard (blank) Ductile Iron, Galvanized
S4 304 Stainless Steel
S6 316 Stainless Steel
B Bronze
Note 1. All standard styles furnished complete with
galvanized ductile iron female unions, with ends
threaded NPT (IPT) to ANSI B-2.1. For other materials,
see above table. Other threading, including: BS,
DIN, JIS, etc. are available on special order.
Note 2. This floating flange design can be furnished
with bolt-on flange adaptors to connect to: copper
tubing, threaded brass or PVC and cementable PVC,
piping. Call Thorburn for details: 1-800-363-6613.
Bolt-on Flange with
Adapter for Connecting
to Copper or PVC
available upon request
102-12-XX 0.75 8 .87 .23 .87 32.2º 1.06 5.88 1.6
102-12HP-XX 7 .75 .23 .63 32.2º 1.06 4.88 1.7
102-16-XX 1.00 8 .87 .23 .87 25.3º 1.14 5.72 2.6
102-16HP-XX 7 .75 .23 .63 25.3º 1.14 4.72 2.7
102-20-XX 1.25 8 .87 .23 .87 20.7º 1.26 5.48 3.3
102-20HP-XX 7 .75 .23 .63 20.7º 1.26 4.48 3.4
102-24-XX 1.50 8 .87 .23 .87 17.5º 1.30 5.40 4.0
102-24HP-XX 7 .75 .23 .63 17.5º 1.30 4.40 4.1
102-32-XX 2.00 8 .87 .23 .87 13.3º 1.42 5.16 5.5
102-32HP-XX 7 .75 .23 .63 13.3º 1.42 4.16 5.6
XX: Suffix material code. Please note Model 102HP is a special and please check delivery before ordering.
Pressure
Maximum Operating Minimum
Thorburn Positive Negative Test Burst
Style # PSIG In. of Hg. PSIG PSIG
201 150 26” 225 600
201HP 250 26” 375 1000
Available in limited rubbers.
Thorburn
Part
Number
HOW TO ORDER
102-12HP-DC = 3/4” High pressure female union connector
with nitrile tube and neoprene cover
Page 41
Styles Sizes Movements Dimensions Weights
Allowable Movement Dimensions Weight
from Neutral (lbs.)
Nominal
Pipe Size
“F” Overall
Length
In. of Axial
Compression
In. of Axial
Extension
± In. of Lateral
Deflection
"F"
B A
± Angular
Deflection
“A” Length
of Fitting
“B” Length
of Rubber
Available Elastomer Materials
Overall
Length
I.D. of
Part
Thorburn’s Model 102 standard union connector comes with
control cables for added protection and to prevent over-extending
leakage during start-up
With Screw
on Unions
Material Tube Cover Maximum
Code XX Elastomer Elastomer Operating
Temp. ºF
EE Butyl Butyl 250º
HH EPDM EPDM 250º
FC Hypalon Neoprene 212º
CC Neoprene Neoprene 225º
DC Nitrile Neoprene 212º
To order connector with desired material insert above codes
where XX is located. Please note that Thorburn’s Model
102HP is available in EPDM tube and cover only.

THORBURN THE FLEXIBLE PIPING SPECIALIST
ELBOW-FLEX EXPANSION JOINTS SERIES REF/REFR
Thorburn’s spherical 90º elbow combines the basic
shape and dimensions of the metal elbow with the
movement/sound reduction/vibration absorbing
features of a flexible component into one unit
COMPARE THESE ADVANTAGES
■ Absorbs pipe movement/stress
■ Reduces system noise
■ Isolates mechanical vibration
■ Compensates for misalignment or offset
■ Eliminates electrolysis
■ Protects against start-up surge forces
■ Simplifies installation
Thorburn singlesphere
accepts
motion in all modes
Piping supported
from above
Reduced
foundation size
as there is no
need for elbow
support
Thorburn’s rubber spherical 90º elbows are designed to
replace metallic or rubber lined elbows used in connecting
piping at a right angle and/or to be connected to operating
equipment such as: pumps, chillers, cooling towers,
compressors, blowers, fans, absorption machines.
Thorburn’s problem solving elbow connectors are available
in standard series REF and reducing series REFR.
Page 42
TYPICAL APPLICATIONS
■ Air conditioning, heating and ventilating systems
■ Industrial process piping systems
■ Power generating plants
■ Waste water, water, sewage treatment plants
■ Pulp and paper and steel mills
■ Marine board piping
■ Pollution control system
Thorburn’s Elbow-Flex connectors completely solve the
vibratory directional problem at the pumps or any other
location where the piping must make a right angle turn as it
leaves the equipment.
When Thorburn rubber elbows are used,
the pump foundation need no longer be
made large enough to support the base
elbows and this reduces the cost of the
foundation. Since the piping must be
properly supported from above rather than
rest on the pump foundation, there is a
better chance that the pump foundation can
operate properly. The reduced foundation
weight is often important in lightweight
equipment rooms as well.
Typical Thorburn Elbow-Flex connector

THORBURN THE FLEXIBLE PIPING SPECIALIST
ELBOW-FLEX EXPANSION JOINTS SERIES REF/REFR
Thorburn
Style REF
Standard moulded
elbow with
floating flanges
Page 43
Thorburn
Style REFR
Reducing elbow
with floating
flanges
Allowable Movements Relative to Stationary End
Nominal Pipe Maximum
Size x Length Working Horizontal Perpendicular Transverse Angular Approx.
Thorburn Part
Center to Face Pressure Compression/Extension Compression/Extension Lateral Movement Weight
Number I.D. x C/F P.S.I.G. X X’ Y Y’ Z & Z’ ± Degree Pounds
1.25REF3.75-XY 1.25 x 3.75 195 .75 .63 .75 .63 .63 9.5 4.5
1.5REF4-XY 1.5 x 4 195 .75 .63 .75 .63 .63 8.9 5.4
2REF-4.5XY 2 x 4.5 175 .75 .63 .75 .63 .63 7.9 8.3
2.5REF5-XY 2.5 x 5 160 .75 .63 .75 .63 .63 7.1 12.4
3REF5.5-XY 3 x 5.5 160 .75 .63 .75 .63 .63 6.5 13.1
4REF6.5-XY 4 x 6.5 160 .75 .63 .75 .63 .63 5.5 18.0
5REF7.5-XY 5 x 7.5 140 .75 .63 .75 .63 .63 4.8 24.5
6REF8-XY 6 x 8 125 .75 .63 .75 .63 .63 4.5 30.5
88REF9-XY 8 x 9 125 .75 .63 .75 .63 .63 4.0 46.8
10REF11-XY 10 x 11 105 .75 .63 .75 .63 .63 3.3 65.8
12REF12-XY 12 x 12 100 .75 .63 .75 .63 .63 2.9 98.2
Allowable Movements Relative to Stationary End
Nominal Pipe Maximum
Size x Length Working Horizontal Perpendicular Transverse Angular Approx.
Thorburn Part Center to Face Pressure Compression/Extension Compression/Extension Lateral Movement Weight
Number I.D. x I.D. x C/F P.S.I.G. X X’ Y Y’ Z & Z’ ± Degree Pounds
3REFR2-XY 3 x 2 x 7.25 160 .75 .63 .75 .63 .63 4.9 14.0
3REFR2.5-XY 3 x 2.5 x 7.75 160 .75 .63 .75 .63 .63 4.9 15.0
4REFR3-XY 4 x 3 x 9 160 .75 .63 .75 .63 .63 4.0 19.0
5REFR4-XY 5 x 4 x 10.25 140 .75 .63 .75 .63 .63 3.5 26.0
6REFR3-XY 6 x 3 x 11.5 125 .75 .63 .75 .63 .63 3.1 31.0
6REFR4-XY 6 x 4 x 11.5 125 .75 .63 .75 .63 .63 3.1 32.0
8REFR5-XY 8 x 5 x 14 125 .75 .63 .75 .63 .63 2.6 48.0
8REFR6-XY 8 x 6 x 14 125 .75 .63 .75 .63 .63 2.6 49.0
10REFR8-XY 10 x 8 x 16.5 105 .75 .63 .75 .63 .63 2.2 67.0
12REFR10-XY 12 x 10 x 19 100 .75 .63 .75 .63 .63 1.9 99.0
X Y = Tube and cover material (see below right)
OPERATING CONDITIONS
Operating pressure: 1475 KPA/214PSI
Burst pressure 5900 KPA/850PSI
Vacuum rating: 750 mm/30” Hg
Temperature: -10ºC to 105ºC
OPERATING PRESSURES/TEMPERATURES
WITH NEOPRENE TUBE AND COVER
80øC/180ºF 225 PSI
90ºC/195ºF 180 PSI
95ºC/205ºF 150 PSI
100ºC/212ºF 145 PSI
105ºC/225ºF 125 PSI
MATERIAL CODES
Tube and Cover Type of Elastomer
Thorburn Tube Cover
Maximum Rated
Operating Pressure
Material Codes Outside Inside Temperature
AC Natural Neoprene 180ºF
DC Nitrile Neoprene 212ºF
CC Neoprene Neoprene 225ºF
FC Hypalon Neoprene 212ºF
HH EPDM EPDM 250ºF
EE Butyl Butyl 250ºF
Note: 1) The amount of angular movement is based on the maximum allowable extension movement
from neutral. Angular movement can be increased, if it is in conjunction with compression. 2)
Pressure rating is based on 180ºF operating temperature. At higher temperatures, the pressure rating
is reduced slightly. Minimum burst pressure is 4.1. 3) Standard flange drilling 150# plated steel.
Other drilling patterns and flange materials available upon request.

THORBURN THE FLEXIBLE PIPING SPECIALIST
FLANGED PUMP CONNECTOR
MODEL 60RPC
Ultra Quiet Sound Absorbing System
Thorburn’s 60RPC is an ultra quiet sound absorbing integral flanged pipe
connector. The flange is drilled to conform to the bolt pattern of the
companion metal flanges of the pipeline. Thorburn’s 60RPC is manufactured
from high quality elastomers to safely satisfy your chemicalabrasion-sound
requirements. Specify Thorburn’s 60RPC and you are
assured of the highest quality leak tight sound and movement absorbing
pump connector system in the world.
THORBURN’S 60RPC ADVANTAGES
Cross sectional view of flanged type flexible
rubber connector
Absorbs pipe wall and fluid-borne noise
The low sound transmission properties of rubber allow for pipe wall sounds to be absorbed by Thorburn’s 60RPC
connector by the volumetric expansion (breathing of Thorburn’s 60RPC connector). In other words, sound weakens
travelling through rubber. Thorburn’s 60RPC length influences sound absorption. See specifications on page 45 for
optimum length details.
Isolates vibration and motion
Vibration originating from mechanical equipment is absorbed by Thorburn’s 60RPC connectors. As most machinery
vibrates in a radial direction from the main shaft, Thorburn’s 60RPC should be installed horizontally and parallel to
this main shaft. Thorburn’s 60RPC will tolerate minimal axial motion. But for two-plane vibration/motion, it is
recommended to use two flexible rubber connectors installed at right angles, one to absorb the horizontal vibration
and one the vertical vibration. A tension anchor is usually needed to stabilize the elbow between the connectors.
Piping system misalignment compensation
Installation in a rigid piping system is facilitated and Thorburn’s 60RPC connectors add a flexible component that is
automatically self correcting for misalignment created by structural movements caused by thermal expansion or
ground shifts. See page 40 for product specification details.
Reduce system stress and strain
Rigid attachment of piping to critical or mechanical equipment can
produce excessive loading. Thermal or mechanically created
strains-stress-shock are cushioned and absorbed with the installation
of Thorburn 60RPC.
Full flow with less turbulence or material
entrapment
Thorburn’s 60RPC connectors’ smooth rubber lining allows full
flow without turbulence. Metallic connectors depend upon bellows
or convolutions to absorb motion. These bellows/convolutions
can create flow turbulence and also create an area for material
entrapment or bacteria growth.
NEW
WARNING: Control unit cable or rod assembly usage: Thorburn control units are designed to protect Thorburn 60RPC connector from excessive elongation.
Control rods are always recommended as a protection against: 1) thermal shrinkage in the piping, 2) hydrostatic tests at elevated pressures and 3) line pressure
surges. Thorburn control rods must be used: 1) when the piping containing the rubber connector is not anchored and 2) when the rubber connector is attached
to unsupported pipe or equipment.
Page 44
THORBURN’S NEW SOUND
SENSITIVE ACOUSTICAL
CONTROL CABLES
Steel Washer
“HAW” Washer
System
Helical Wire
Reinforcement
Split Retaining
Rings
Plow Steel Cable
Control Cable Plate
ACOUSTICAL CONTROL CABLES
MODEL “TACC”
Tube
Fabric
Reinforcement
TRADITIONAL CONTROL
ROD ASSEMBLY
Steel Washer
Rubber Washer
Tie Rod
Control Rod Plate
CONTROL RODS
MODEL “CR”
Acoustical control cable assemblies are recommended for vibration
in noise sensitive applications.

THORBURN THE FLEXIBLE PIPING SPECIALIST
Flange & Ret. Ring O.D.
Nominal Pipe Size
Joint I.D.
Thorburn
Part Number
60RPC-12
60RPC-16
60RPC-20
60RPC-24
60RPC-32
60RPC-40
60RPC-48
60RPC-56
60RPC-64
60RPC-80
60RPC-96
60RPC-116
60RPC-160
60RPC-196
60RPC-224
60RPC-256
60RPC-288
60RPC-320
Nominal Pipe
Size: Pipe I.D.
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12
14
16
18
20
FLANGED PUMP CONNECTOR MODEL 60RPC
QUIET PIPING SYSTEM
125/150# Flange Dim. 1
Pipe - Rings - Rods
Flange
O.D.
3.88
4.25
4.62
5.00
6.00
7.00
7.50
8.50
9.00
10.00
11.00
13.50
16.00
19.00
21.00
23.50
25.00
27.50
Bolt
Circle
2.75
3.12
3.50
3.88
4.75
5.50
6.00
7.00
7.50
8.50
9.50
11.75
14.25
17.00
18.75
21.25
22.75
25.00
HOW TO ORDER THORBURN’S 60RPC FLANGED CONNECTORS
# Holes
Product Length Pressure Material Code*
Part Code Inches Code Tube / Cover Rings
60RPC160 24 SP D C R
Size of Holes
4 - .625
4 - .625
4 - .625
4 - .625
4 - .750
4 - .750
4 - .750
8 - .750
8 - .750
8 - .875
8 - .875
8 - .875
12 - 1.000
12 - 1.000
12 - 1.125
16 - 1.125
16 - 1.250
20 - 1.250
Pipe
Dimensions
“A” Flange
Thickness
.591
.591
.591
.591
.591
.591
.591
.591
.591
.591
.591
.591
.787
.787
.787
.787
.875
1.000
If required temperature is greater than 180ºF, please specify
Also available with metallic plated steel floating flanges
Steel
Retaining
Ring
“B” Body
Thickness
.472
.551
.551
.551
.551
.591
.591
.669
.669
.669
.709
.787
.866
.984
.984
.984
1.000
1.000
Now available with
virgin teflon lining for
the ultimate in chemical
compatibility
Sizes up to 48” I.D. by
50’ long
Oper. Press.
Positive
psig
Style
SP
150
150
150
150
150
150
150
150
150
150
150
150
150
150
125
100
100
100
Style
HP
300
300
300
300
250
250
250
250
250
250
250
250
250
250
200
150
150
150
Note 1: Dimensions shown meet 125/150# standards of: ANSI B-16.1, B-16.24, B-16.5; AWWA
C-207 Table 1 and 2, Class D; MSS SP-44 and NBS/PS 15-69.
2: Other flange drilling and dimensions available upon request.
3: Vacuum rating is 30” hg. in all cases. Pressure rating is based on 180ºF operating
temperature. For higher temperatures pressure might be reduced. Contact Thorburn.
Code
Material Codes
Tube Cover Max. Oper.
Temp.
EE Butyl Butyl 250ºF
JE Teflon Butyl 250ºF
HH EPDM EPDM 250ºF
BC Gum Neoprene 180ºF
FC Hypalon Neoprene 212ºF
CC Neoprene Neoprene 225ºF
DC Nitrile Neoprene 212ºF
Page 45
NEW
Nominal Pipe
Size: Pipe I.D.
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6
8
10
12
14
16
18
20
“F” Natural Length
“Face-to-Face” (1)
12*
18
12*
18
12*
18
24
12*
18
24
12*
18
24
30
12*
18
24
30
18*
24
30
18*
24
30
18*
24
30
24*
30
24*
30
24*
30
48
24*
30
48
24*
30
48
24*
30
48
24*
48
24*
48
24*
48
Movement Capability
From Neutral
In. of Axial
Compression/ext.
.158
.236
.158
.236
.158
.236
.315
.158
.236
.315
.158
.236
.315
.354
.158
.236
.315
.354
.236
.315
.354
.236
.315
.354
.236
.315
.354
.315
.354
.315
.354
.236
.276
.472
.236
.276
.472
.236
.276
.472
.236
.276
.472
.236
.472
.236
.472
.236
.472
± In. of Lateral
Deflection
1.97
2.96
1.77
2.66
1.58
2.36
3.15
1.39
2.09
2.78
1.18
1.77
2.36
2.96
.98
1.48
1.97
2.46
1.18
1.58
1.97
.89
1.18
1.48
.89
1.18
1.48
.89
1.12
.89
1.12
.71
.89
1.42
.63
.79
1.26
.47
.59
.95
.47
.59
.95
.47
.95
.24
.48
.24
.48
± Angular
Deflection (2)
21.8
31.0
17.7
25.6
14.0
20.6
26.6
11.3
16.7
21.8
9.1
13.5
17.7
19.8
7.0
10.5
13.8
15.5
8.5
11.3
12.7
7.6
10.1
11.3
6.8
9.1
10.2
7.3
8.2
6.1
6.8
3.4
4.0
6.8
2.7
3.2
5.5
2.3
2.7
4.2
2.0
2.3
3.9
1.7
3.4
1.5
3.1
1.4
2.7
Approximate Weight/Lbs
Connector Only
2.4
3.2
3.3
4.2
4.0
5.0
6.0
4.3
5.4
6.5
5.6
6.8
8.0
9.2
6.9
8.2
9.5
10.0
10.6
11.7
14.6
12.2
14.7
17.2
14.5
17.4
19.7
20.1
23.1
24.1
27.2
35.7
40.2
59.4
48.7
59.0
92.0
66.5
81.0
126.0
108.0
133.0
208.0
153.0
294.0
205.0
394.0
270.0
519.0
Retaining Ring Set
Weight in pds
1.5
1.9
2.4
2.6
3.6
5.3
5.6
6.5
7.3
7.9
9.1
14.0
17.0
24.1
26.8
32.1
30.6
35.9
Notes: * 1: For optimum noise and vibration absorption, use this
or longer length
2: The degree of angular movement is based on the
maximum rated extension
3: Larger I.D. or length sizes available

THORBURN THE FLEXIBLE PIPING SPECIALIST
ULTRA-QUIET SMALL DIAMETER COUPLED PIPE CONNECTORS
Thorburn’s 660PC (150 psi) and 760PC (250 psi) rubber pipe
connectors are designed for smaller diameter pipelines and
come with factory attached couplings and are usually supplied
with male/male couplings but are also available with male/
female fittings. Thorburn’s 660PC are specifically designed
to eliminate vibration between pump and pipeline either for
suction or discharge service.
Model #
660/760PC(T)-12
660/760PC(T)-12
660/760PC(T)-12
660/760PC(T)-12
T = High temperature
STANDARD DIMENSIONS FOR VIBRATION
Standard Standard
Pipe Size Overall Pipe Size Overall
I.D. (in.) - Code Length (in.) - Code I.D. (in.) - Code Length (in.) - Code
3/4 12 12 012 2 32 24 024
1 16 18 018 2 1/2 40 24 24
1 1/4 20 18 018 3 48 36 036
1 1/2 24 18 018 4 64 36 036
PRODUCT SPECIFICATIONS
Maximum Water
Working Pressure Service Temperature
Model (psi) (ºF)
660PC 150 180
660PCT 150 250
760PC 250 180
760PCT 250 250
Page 46
Thorburn’s 660PC coupled type rubber pipe connector
with female end
HOW TO ORDER THORBURN COUPLED RUBBER PIPE CONNECTORS
Part number description for Thorburn’s Coupled Pipe Connectors
High Temperature Model 760PCT
Overall Length
F
Model Size I.D. Code First End Material Second End Material Length
760PCT 24 MPS6 MPS6 018
C
End Codes
Male NPT = MP
Female NPT = FP
Special = XX
Material Codes
Aluminium = A
Carbon Steel = C
316SS = S6
Other Specify = 0
B
A
ID of
part

THORBURN THE FLEXIBLE PIPING SPECIALIST
PAPER MILL SUCTION COUCH MODEL 28TW
(accordion type)
OTHERS
SOFT CUFF, FLANGED, BEADED OR SPECIAL ENDS
Smooth bore type also available. Specify
128TW. Flexibility will be reduced by 25%
to 40%.
FOR ORDERING DETAILS, SEE PAGE 51
TECHNICAL SPECIFICATIONS
Thorburn
Hose I.D. Hose O.D.
Min. Bend
Radius
Appr. Weight
Part in. in. in. Lbs/
Number 100 ft
28TW32 2 2-11/16 4 283
28TW38 2-3/8 3-1/16 5 320
28TW46 2-7/8 3-9/16 6 355
28TW48 3 3-3/4 6 367
28TW56 3-1/2 4-1/4 7 408
28TW64 4 4-5/8 8 441
28TW66 4-1/8 4-3/4 8 462
28TW68 4-1/4 4-7/8 9 479
28TW72 4-1/2 5-1/8 9 506
28TW80 5 5-5/8 10 547
28TW80 5-1/4 6-1/8 11 585
28TW84 5-9/16 6-3/16 11 589
28TW89 6 168 12 622
28TW96 6-1/4 181 13 662
28TW100 6-5/8 7-1/4 13 665
28TW106 8 8-5/8 16 793
28TW128 8-1/4 8-7/8 17 818
28TW136 8-1/2 9-1/8 17 832
28TW138 8-5/8 9-1/4 17 840
28TW140 8-3/4 9-3/4 18 886
28TW160 10 10-5/8 20 957
28TW164 10-1/4 10-7/8 20 979
28TW168 10-1/2 11-1/2 21 1009
28TW172 10-3/4 11-3/8 21 1019
28TW192 12 12-5/8 24 1119
28TW224 14 15 28 1729
28TW256 16 17 32 1902
Page 47
APPLICATION
Thorburn's 28TW is a custom designed material
handling hose that supports full vacuum suction
with incredible minimum bend radius capabilities.
Thorburn's 28TW will accept a high degree of
lateral flexing as well as contraction due to end
thrust. The 28TW is an ideal flexible component
for services that require the suction box on paper
machine to be raised or lowered.
CONSTRUCTION
Tube: Corrugated black synthetic rubber.
Reinforcement: Polyester fibre wire. Reinforced
for full vacuum.
Cover: Black synthetic corrugated rubber.
INCREDIBLE
FLEXIBILITY
SPECIAL NOTE
For custom tube, cover and
end configurations see page
51 for hose assembly
ordering information.

THORBURN THE FLEXIBLE PIPING SPECIALIST
FLEXIPIPE (Wire-reinforced) 60TMH
Custom built flexible piping connectors
APPLICATION
Thorburn Flexipipe is a custom designed rubber piping system that replaces metal
pipe and is used in lines requiring resistance to electrolysis, corrosion, abrasion and
water hammering. Thorburn Flexipipe is also specifically engineered for piping
systems that require isolation and absorption of severe noise, vibration, misalignment,
lateral deflection and flexing and/or movements caused by temperature changes.
Thorburn Flexipipe can be custom designed and manufactured for piping systems
that require the benefits of moulded rubber elbows with tangents, or tees with
various radius, multi-branch connections and transition joints. Thorburn Flexipipe's
typical applications are found in mines, quarries, cement plants, petrochemical plants, paper mills,
ship building, offshore, sewage treatment plants and high rise heating ventilation systems.
CONSTRUCTION - 60TMH
Tube: 60TMH Flexipipe is available with various
tube compounds wall thickness to maximize service
life and is determined by the application and the
media.
Reinforcement: 60TMH Flexipipe is made of multiple
layers of precisely angled cross woven fabric with
calendared polyester or fibreglass fabric. Flexipipe
60TMH is integrally built with an evenly spaced heavy
duty helix spring wire that withstands rated working
pressures from full vacuum to 1000 psi. Thorburn
FLEXIPIPE (Non wire-reinforced) 61TMH
Custom built flexible piping connectors
CONSTRUCTION - 61TMH
Tube: 61TMH Flexipipe is available with various
tube compounds and wall thicknesses to maximize
service life and is determined by the application
and the media.
Reinforcement: 61TMH Flexipipe is made of
multiple layers of precisely angled cross woven
fabric with calendared polyester or fiberglass fabric;
withstands rated working pressures to 1000 psi.
APPLICATION
Thorburn Flexipipe 61TMH is a heavy duty material handling hose
specifically designed for discharge service. The 61TMH has the ability
to withstand severe shock and abuse without transmitting vibration, and is
the companion hose to 60TMH, with the exception that it is non wire-reinforced.
Page 48
Flexipipe can be designed to support a minimum
bend radius from two times the diameter or maintain
unsupported rigidity over long length. Please call
Thorburn for details.
Cover: Flexipipe is available with various cover
compounds and wall thicknesses to maximize service
life and is determined by the application.
Sizes: 1/2" to 30" I.D. up to 100 feet long. Longer
lengths available on special order only.
Cover: Flexipipe is available with various cover
compounds and wall thicknesses to maximize service
life and is determined by the application.
Sizes: 1/2" to 30" I.D. up to 100 feet long. Longer
lengths available on special order only.

THORBURN THE FLEXIBLE PIPING SPECIALIST
CUSTOM HANDCRAFTED RUBBER PIPE AND FITTINGS
FROM 2” TO 30” I.D.
Elbows, tees, laterals, crosses, reducers, transitions
When the good people at Miramichi pulp and paper wanted to redesign their open
trough piping system between the caustizers and slaking tank, Thorburn’s
flexible piping design team was called into action. The project involved
designing, manufacturing and supplying a complete elastomeric piping system.
Thorburn’s 14” I.D. rubber flexible piping system, consisting of a
14” custom rubber long radius elbow connected to rubber flanged
tee which is further connected to a 15 plus feet of rubber flanged
piping system.
CUSTOM ELASTOMERIC PIPING SYSTEMS MADE EASY
When Norsk Hydro Becancour, Quebec, was looking for an economical and practical solution to its extreme abrasion
problem, Thorburn’s flexible piping specialists designed, manufactured and supplied a timely solution with Thorburn
rubber piping.
Thorburn can custom design and supply
rubber lateral connectors
Branch connector or custom transition connections
can be handled by Thorburn flexible piping design
engineers
Page 49
SPECIALITY
ITEMS
BRANCH JOINTS, TEES AND
TRANSITION UNITS MADE EASY
BY THORBURN
Thorburn’s wire reinforced 60TMH
rubber piping system
Elbows Tees
Laterals Transition joints
Thorburn provides flexibility you can
count on

THORBURN THE FLEXIBLE PIPING SPECIALIST
Capped end
Code “PE”
Integral rubber
tapered nozzle end
Code “ITN”
Beaded ends with split
flanges - Code “BE”
Built-in nipple with flange
Code BINF 150 (300) Specify drilling
Built-in nipple threaded/Code BIN
Available in lengths up to 50 feet
Diameters up to 48” available
FLEXIPIPE HOSE ENDS
Enlarged end
Code “EE”
Built-in victaulic nipple
Code BINFV
Page 50
Soft end
Code “SE”
Wire to end
Code “WTE”
Integral flange ends
Code “IFE”
Built-in nipple flange
Code NLS150
FLEXIPIPE CUSTOM DESIGNED FLEXIBLE PIPING
See page 51 for ordering details
Teflon lined for
added corrosion
resistency
Shown BIN
Rubber and duck flanges
with split rings
Code “RDF”
Corrugated cover to
improve flexibility

THORBURN THE FLEXIBLE PIPING SPECIALIST
HOW TO ORDER THORBURN FLEXIPIPE ASSEMBLIES
Tube and Cover Compounds
Code A Black natural rubber. Used for abrasive and corrosive materials. 180ºF.
Code B Pure gum. Used for abrasive and corrosive materials. 180ºF.
Code C Neoprene. Oil resistance good weathering and aging characteristics. 200ºF.
Code D Nitrile. Oil resistance excellent tube compound for OS & D service. 225ºF.
Code E H 3 (Butyl). For temperature conditions up to 250 o F.
Code F Hypalon. Used for light acids and chemicals. 225ºF.
Code G Cross linked polyethylene inert to most acids and chemicals to 150 o F*.
Code H EPDM used for abrasive and corrosive materials up to 250 o F.*
Code I Viton inert to most chemicals and acids up to 300 o F.*
Code J Teflon is inert to aggressive chemicals and acids to 350 o F.*
Our Flexipipe hoses are manufactured to the latest RMA standards.
* When considering using these compounds, contact Thorburn Sales Department with all design
requirements i.e. working temperatures and possibly size production limitation.
Working Pressure Codes
Page 51
Tube and Cover Thickness
Code 01 1/16" tube wall
Code 02 1/8" tube wall
Code 04 1/4" tube wall
Code 06 3/8" tube wall
Code 08 1/2" tube wall
Please note teflon lining is typically
less than 1/8”
Code 25: 25 psi Code 75: 75 psi Code 100: 100 psi
Code 150: 150 psi Code 250: 250 psi Code 500: 500 psi
Code 1000: 1000 psi
Flexipipe Hose Ends
Code PE: plain end; Code SE: soft end; Code BINF300: built-in nipple with 300# flange; Code EE: enlarged end; Code
RDF: rubber and duck flanges; Code BE: beaded end; Code IFE: integral flanged end; Code BIN: built-in nipple threaded;
Code BINV: built-in victaulic end; Code BINF150: built-in nipple with 150# flange; Code ITN: integral rubber tapered
nozzle; Code NLS150: Thorburn's exclusive never leak system; Code WTE: Wire to the end.
How to order straight Flexipipe assembly by part number
(I.D. is always in 1/16”; i.e. 64 = 4” 48 = 3” 128 = 8”)
Example Flexipipe Code Assembly Number 60TMH6IH0402150RDFBE120
Hose type Inside diameter Compound Thickness Working Ends Overall length
inches material inches pressure PSI inches
Tube Cover Tube Cover First Second
60TMH 96 I H 04 02 150 RDF BE 120
Flexipipe 6 inches Viton EPDM 1/4" 1/8" 150 WP Rubber/duck flange 120"
x
Other Models 61TMH Flexi-Pipe non wire-reinforced: see page 48
28TW Paper mill suction couch: see page 47
128TW Paper mill suction couch smooth tube: see page 47
Beaded end
To order Thorburn rubber fittings please see pages 52 and 53 for details

THORBURN THE FLEXIBLE PIPING SPECIALIST
THORBURN’S SPECIAL HANDCRAFTED
RUBBER FITTINGS
Thorburn’s special handcrafted rubber fittings are strong, rugged and
flexible. They will reduce noise and vibration from pumps, compressors
and other equipment and allow for minor misalignment where abrasion
or corrosion will damage normal piping. These fittings are custom designed
and can be manufactured from various materials. End configurations can
suit any piping applications. Samples are included below.
90º Standard Radius
Model 60TMH-E90
“Y” Connectors
Model 60TMH-Y
Concentric reducer
Model 60TMH-RC
90º Long Radius
Model 60TMH-EC90
Tee Connectors
Model 60TMH-T
Custom special
Transition joints and elbows
with various tangents also
available
Page 52
Header Flex
■ Reduces noise and vibration
■ Protects pump casing
■ Relieves pipe stress and strain
45º Elbow
Model 60TMH-E45
Cross Connectors
Model 60TMH-C
NEW
Eccentric reducer
Model 60TMH-EC

THORBURN THE FLEXIBLE PIPING SPECIALIST
HH
90º elbow
HH
60TMH-
E90
Fitting
Model #
60TMH-C
JJ
Nominal
Diameter
(in.)
10
THORBURN’S HANDCRAFTED
ALL RUBBER FLANGED PIPE FITTINGS
DIMENSION DETAILS
Long radius
elbow
JJ
Compound 1
Tube Cover
D C
Notes 1) For compound codes please see page 51
2) For thickness codes please see page 51
3) Flange drilling 150# Standard for other types of drilling #300, DIN,
JIS, British standard, etc., please specify
4) When specifying elbows with tangents different radius than shown,
transition joints and multi-branch connectors, please include a sketch
5) Special requirements, please specify
45º elbow Tee Cross Lateral Reducer
KK
KK
HH HH NN
Thickness (in.) 2
Tube Cover
04 02
Page 53
HH HH
MM
Working
Pressure
(psi)
150
LL LL
60TMH-E90L 60TMH-E45 60TMH-T 60TMH-C 60TMH-L 60TMH-RC
60TMH-EC
DIMENSION DETAILS
90º Elbow,
Nominal Pipe Movement Movement Tee, Cross, Long Radius 45º Elbow Lateral Long Lateral Short Reducer
Size (in.) Axial Lateral HH (in.) Elbow, JJ (in.) KK (in.) Leg, LL (in.) Leg, MM (in.) NN (in.)
2 0.5 0.5 3 4 3 11 6 15
2.5 0.5 0.5 4 5 3.5 13 6 15
3 0.5 0.5 5 6 4 13 6 15
3.5 0.5 0.5 6 8 4.5 15 6 15
4 0.5 0.5 7 9 5 15 6 15
5 0.75 0.75 8 10 6 17 7 15
6 0.75 0.75 9 12 6.5 18 7 15
8 0.75 0.75 12 15 7.5 22 9 22
10 0.75 0.75 14 17 8 25 9 22
12 0.75 0.75 17 21 10 30 11 23
14 0.75 0.75 19 24 12 32 11 29
16 0.75 0.75 22 28 14 35 12 29
18 0.75 0.75 26 32 16 37 12 29
20 0.75 0.75 30 36 18 43 16 32
24 0.75 0.75 34 42 21 49 17 32
HOW TO ORDER THORBURN’S CUSTOM RUBBER FITTINGS 4
Ends 3
First Second
RDF RDF
Special 5
Warning: Always include maximum
media temperature, pressure, if steam is
present or what the media is when
specifying Thorburn fittings. Otherwise,
Thorburn’s warrantee is void.

THORBURN THE FLEXIBLE PIPING SPECIALIST
MODEL 42HP TEFLON LINED RUBBER EXPANSION JOINTS
QUALITY YOU CAN COUNT ON!
Thorburn Mighty-Spool Model 42HP teflon lined rubber expansion
joints were specifically designed to resist corrosive attack at elevated
temperatures and pressures where metallic, plastic or elastomeric
expansion joints would be inadequate. Thorburn’s 42HP teflon lined
expansion joints are installed next to mechanical equipment or between
anchor points in your process piping system and will provide the
following advantages.
Advantages
■ Corrosive resistant/antistick
■ Absorbs pipe movement/stress
■ Reduces system noise
■ Isolates mechanical vibration
■ Compensates alignment/offset
■ Eliminates electrolytic action and electrolysis
■ Protects against start-up/surge forces
Page 54
Thorburn’s Model 42HP teflon lined rubber expansion
joints extends beyond the bolt holes to the outside diameter
of the flange providing complete protection to the elastomeric
body. This feature will eliminate leaking/weeping
flange failure.
Materials
Thorburn’s Model 42HP teflon lined rubber expansion joint tube is custom moulded virgin teflon (PTFE, FEP or PFA). Crystallinity is
carefully controlled, resulting in longer flexible and high tensile strength. In addition, no pigments or additives are used which can leach
out and contaminate your process or result in premature failure of the expansion joint.
Shown is a Thorburn 42HP teflon lined
rubber expansion joint which was used
in a “white water” piping system which
was successfully used as a replacement
for a failed competitor’s chlorobutyl
rubber expansion joint.
Applications
Thorburn’s Mighty-Spool teflon lined expansion joints have been specifically
designed for tough demanding corrosive chemical applications that are found
in the following applications:
■ Petrochemical
■ Power generating plants
■ Steel mills
■ Marine services
■ Waste water-sewage
■ Pollution control systems
■ Industrial process piping systems
■ Pulp and paper industries
Mighty-Spool pulp & paper industry
Thorburn’s Mighty-Spool teflon lined expansion joints have been employed very
successfully for years on tough demanding pulp and paper applications, such as whitegreen-black
liquor lines, bleach plant chlorination and caustic extraction piping, where
the ability to resist corrosive attack at elevated temperatures and pressures would be or
were a problem for traditional metallic, plastic or elastomeric expansion joints.

THORBURN THE FLEXIBLE PIPING SPECIALIST
Thorburn’s teflon liner
covers the “flange face”
to prevent leaking/
weeping flanges. In
addition, Thorburn’s
model 42HP has no
pigments to leach out
and cause failure. When
you want quality
expansion joints, specify
Thorburn!
Nominal Pipe Size
Exp. Jt. I.D.
1
1 1/4
1 1/2
2
2 1/2
3
4
5
6
8
10
12
14
16
18
20
22
24
30
36
48
60
72
96
“Face to Face” Minimum
Recommended Length
Single
Arch
6
6
6
6
6
6
6
6
6
6
8
8
8
8
8
8
10
10
10
10
12
12
12
12
MODEL 42HP MIGHTY-SPOOL TEFLON LINED
RUBBER EXPANSION JOINTS
How to order 42HP teflon lined joints
Two
Arch
10
10
10
10
10
10
10
10
10
10
12
12
12
12
12
12
14
14
14
14
14
14
14
16
Three
Arch
12
12
12
12
12
12
12
12
12
14
14
14
16
16
16
16
18
18
18
18
18
18
18
18
Single Arch 1 Movement
Non-concurrent
In. of Axial
Compression
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
7/8
1
1
1
1 1/8
1 1/8
1 1/8
In. of Axial
Extension
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
1/4
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
7/16
1/2
1/2
1/2
1/2
1/2
1/2
In. of Lateral
Deflection
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
1/2
Working Pressure
at 220ºF/104ºC
42HP
PSI
225
225
225
225
225
225
225
225
225
200
200
200
200
150
150
150
150
150
150
150
100
75
75
75
Mighty-Spool construction
Tube: The tube is a single moulded teflon (TFE, FEP or PFA)
leakproof lining extending from flange to flange. The outside of
the teflon tube is etched to adhere to the elastomeric overlay.
Carcass: This is a high strength calendared polyester or Kevlar
reinforcing fabric between the teflon tube and the cover.
Metallic reinforcement: These are chemically treated solid round
endless rings or high tensile strength helical wire embedded in the
carcass. The metallic reinforcement provides additional strength
for pressure and vacuum service.
Cover: This is the exterior elastomeric overlay designed to protect
the carcass from external elements. Available in neoprene,
EPDM, viton.
Model Size Arch type Material Retaining Number of Special
ID x F to F Rings Control rods
42HP 10 x 8 SO JC R CR2
Single open SO
Double open DO
Triple open TO
Tube/Elastomeric Cover Code MCOT
Teflon/Neoprene JC 250ºF
Teflon/EPDM JH 300ºF
Teflon/Viton JI 350ºF
Vacuum
in. of Hg.
Page 55
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
29
R = Plated steel
RS4 = 304SS
RS6 = 316SS
Est. Weight
(lbs)
Joint
single arch
2
2.5
3
4
4.5
5.5
8
9
11
15
23
34
40
47
56
67
70
79
117
143
198
309
385
485
Retaining
ring set
2.3
2.5
3
4
5.5
6
7.5
8
9
12
18
22
25
27
29
35
44
48
66
91
138
200
300
432
CR(#) = Plated steel
CRS4(#) = 304SS
CRS6(#) = 316SS
Special = X
Specify
Special notes: For Spring rate force/pounds, see technical specifications for 42HP on page 16. Standard drilling ANSI B16.1-1975, ANSI B16.24-1991 Class 150#.
Special notes on movement capability
1) To calculate movement of multiple arch
type for compression extension and lateral
movements, take movement shown in the
above table and multiply by the number
of arches.
2) Movement capability shown is nonconcurrent
percentage used in one
movement position and must be deducted
from the other movement position so that
sum of movements don’t exceed 100%.
3) Movements shown are based on proper
installation practices.
Special notes on pressures/temperatures
4) For higher temperatures of 220ºF/104ºC
pressures might be reduced. Please call
Thorburn engineering with application
details if MCOT (maximum continuous
operating temperature) exceeds 220ºF/
104ºC.

THORBURN THE FLEXIBLE PIPING SPECIALIST
EASY-FLEX STYLE 101 TEFLON LINED
MOLDED SINGLE SPHERE EXPANSION JOINT SYSTEM
FOR APPLICATIONS REQUIRING ONLY POSITIVE PRESSURE CONTAINMENT
■ Long flowing arch reduces turbulence, sediment build-up
■ Design for positive pressure “only”
■ All wetted parts corrosion resistant teflon lined
■ Floating flanges provide simplified installation
■ Absorbs vibration, noise, shock
■ Absorbs thermal and/or agitated movement
■ Wide service range with low cost
■ Service temperature up to 225ºF
Thorburn
Part
Number
“A” Nominal
Pipe ID
Thorburn introduces its Easy-Flex style 101
spherical arch “Loose fitting” teflon lined
expansion joint system. These elastomeric
expansion joints were specifically designed
for positive pressure applications that require
the corrosion resistance of teflon. Typically
they are more economical than our Mighty-
Spool series and provide an excellent means
to absorb movement, noise, shock and
vibration in your piping system.
Size Movement Pressure Weights
82ºC/180ºF
“F” Neutral Length
Axial Compression
(in.)
Axial Extension (in.)
Lateral Deflection
(in.±)
Angular Deflection
(degrees º ±)
101-1-5JC 1 5 1 1.3 1 35 225 N/A 3.8 3.2
101-1.25-5JC 1.25 5 1 1.3 1 35 225 N/A 5.0 3.2
101-1.5-5JC 1.5 5 1 1.3 1 35 225 N/A 5.1 4.5
101-2-5JC 2 5 1 1.3 1 35 225 N/A 7.1 6.4
101-2.5-5JC 2.5 5 1 1.3 1 30 225 N/A 10.6 7.5
101-3-5JC 3 5 1 1.3 1 30 225 N/A 13.3 8.1
101-3.5-5JC 3.5 5 1 1.3 1 25 225 N/A 16.0 7.2
101-4-5JC 4 5 1 1.3 1 25 225 N/A 16.5 7.2
101-5-5JC 5 5 1 1.3 1 25 225 N/A 20.3 8.1
101-6-5JC 6 5 1 1.3 1 20 225 N/A 22.6 10.3
101-8-5JC 8 5 1 1.3 1 15 225 N/A 35.5 13.2
101-10-5JC 10 5 1 1.3 1 10 225 N/A 49.3 21.0
101-12-5JC 12 5 1 1.3 1 10 225 N/A 73.4 26.5
Positive PSI
Negative In. of Hg 3
Page 56
Joint & Flanges
Approx. lbs
EXAMPLE
101-1-5-JC = Style 101, 1” Nominal diameter with a 5” face-to-face,
teflon lined, neoprene cover
Control Unit &
Rod Set Approx. lbs
WARNING: Thorburn control units required
always in unanchored piping.
Thorburn control units must be installed
when pressures (test, design, surge, operating)
exceed rating below.
Pipe size Pressure
1” through 4” 180
5” through 10” 135
12” 90
NOTES
Construction
Item # Part Materials
1A Body 1A tube lining teflon
1B Body 1B Cover neoprene
2 Reinforce Nylon tire cord
3 Wire Hard spring steel wire
4 Flange Mild steel galvanized,various
drilling and materials available
Note 1: Pressure rating is based on 180ºF operating
temperature. At higher temperatures the pressure
rating is reduced. Contact Thorburn for details.
Note 2: Pressures shown are recommended
“operating”. Test pressure is 1.5 times “operating”.
Burst pressure is approximatly 4 times “operating”.
Note 3: Thorburn style 101 teflon joints have a
loose fit PTFE liner and are not recommended for
vacuum service.
Note 4: Floating flanges drilling meets 125/150lb
standards. Control units are available on special
order. Add suffix CR2 or CR3, depending on the
number of rods required.
Note 5: On some sizes, cover available in EPDM.
Contact Thorburn for details.
WARNING: Safety shields must be used at
all times in hazardous service.

THORBURN THE FLEXIBLE PIPING SPECIALIST
POWER-FLEX
ULTRA HIGH QUALITY TEFLON
EXPANSION JOINT SYSTEM
Power-Flex teflon expansion joints are used primarily in fluid conducting systems as resilient connectors and
tremor barriers. They are designed to compensate for misalignment, to absorb expansion and contraction and to
isolate vibration and shock. They are also frequently used to reduce stress on fragile mating flanges.
WARNING
When expansion joints are used, they must not be viewed as a piping
commodity. They must not be casually specified or arbitrarily dropped into a
piping system. Their application requires careful engineering analysis.
Expansion joints should never be used to compensate for misalignment unless
such misalignment is a calculated basis of design. The safety and operability
of a Power-Flex teflon expansion joint, like that of any piece of critical process
equipment, depends upon proper installation, good operating practice and
regular inspection and maintenance.
WHY SPECIFY POWER-FLEX
1) Power-Flex is made from high molecular weight virgin PTFE (polytetrafluoroethylene) resin. Crystallinity is carefully controlled,
resulting in a long flex-life and high tensile strength. No pigments, lubricants or additives are used which can leach out and
contaminate your process. Rigid inspection for impurities and inclusions is possible, since any contaminants or liner defect is readily
discernible against the white PTFE.
2) Uniform wall thickness Power-Flex is isostaticly moulded providing uniform wall thickness for consistent performance.
3) Power-Flex offers “T” bands standard
a) The “T” bands prevent damage from overcompression of the expansion joint because
the shoulders of the “T” band will “butt” when the Power-Flex has reached its
maximum compression limit.
Universal Power-Flex: Two Power-Flex tied together by a
flanged pipe spool in the middle. Gives maximum amount
of angular and parallel movement. Substantially reduces
the amount of force (spring rate) required to cause
movement.
b) The “T” band gives the Power-
Flex greater stability, safety, and a
longer flex-life because it supports
the “roots” and the side wall of the
convolution under pressure.
Special note: Teflon is a plastic and as such will “creep” under pressure. The
greater the pressure, the greater the “creep”, the more the teflon/convolution/
side wall will be supported by the Power-Flex “T” band.
4) The cable limit primary function is to prevent overexpansion of the
Power Flex when mating flanges are not aligned. Power-Flex allows for the
flanges to oscillate without adding stress or affecting expansion joint flexibility.
Page 57

THORBURN THE FLEXIBLE PIPING SPECIALIST
POWER-FLEX
PREMIER TEFLON EXPANSION JOINT SYSTEM
MOVEMENT SPECIFICATIONS
2 Convolutions 3 Convolutions 4 Convolutions
Size Normal Plus or Angular Parallel Normal Plus or Angular Parallel Normal Plus or Angular Parallel
Length Minus Axial (º Degree) Length Minus Axial (º Degree) Length Minus Axial (º Degree)
1/2 1 5/8 5/16 19 7/32 2 5/32 15/32 28 11/32 2 11/16 5/8 37 15/32
3/4 1 5/8 5/16 17 7/32 2 3/16 15/32 25 11/32 2 23/32 5/8 34 15/32
1 1 3/4 11/32 16 1/4 2 5/16 1/2 24 3/8 2 29/32 21/32 31 1/2
1 1/4 1 25/32 11/32 14 1/4 2 3/8 1/2 21 3/8 2 31/32 11/16 28 1/2
1 1/2 1 13/16 11/32 13 1/4 2 13/32 17/32 20 3/8 3 11/16 26 17/32
2 1 7/8 11/32 12 9/32 2 1/2 17/32 17 13/32 3 1/8 23/32 23 17/32
2 1/2 2 1/8 13/32 11 5/16 2 13/16 19/32 17 15/32 3 17/32 13/16 22 19/32
3 2 3/16 13/32 10 5/16 2 29/32 5/8 15 15/32 3 5/8 27/32 20 5/8
4 2 9/32 7/16 9 5/16 3 1/16 21/32 13 1/2 3 13/16 7/8 17 21/32
5 2 13/32 15/32 8 11/32 3 7/32 11/16 11 17/32 4 1/32 29/32 15 11/16
6 2 17/32 15/32 7 3/8 3 3/8 23/32 10 17/32 4 3/16 31/32 14 23/32
8 2 3/4 17/32 6 13/32 3 21/32 25/32 9 19/32 4 19/32 1 1/16 12 25/32
10 2 31/32 9/16 5 7/16 3 15/16 27/32 8 5/8 4 15/16 1 1/8 11 27/32
12 3 3/16 19/32 5 15/32 4 1/4 29/32 7 11/16 5 5/16 1 7/32 10 29/32
14 3 3/8 5/8 5 15/32 4 15/32 31/32 7 23/32 5 19/32 1 9/32 9 31/32
16 3 11/16 11/16 5 17/32 4 29/32 1 1/16 7 25/32 6 1/8 1 13/32 9 1 1/16
18 4 3/4 4 9/16 5 11/32 1 5/32 7 7/8 6 11/16 1 17/32 9 1 5/32
20 4 5/32 25/32 4 19/32 5 17/32 1 3/16 6 29/32 6 15/16 1 19/32 8 1 3/16
24 4 21/32 7/8 4 21/32 6 7/32 1 11/32 6 1 7 25/32 1 25/32 8 1 11/32
28 5 1/8 1 4 3/4 6 7/8 1 1/2 6 1 1/8 8 9/16 2 8 1 7/16
30 5 5/8 1 1/16 4 13/16 7 17/32 1 5/8 6 1 3/16 9 13/32 2 5/32 8 1 5/8
32 6 1 1/8 4 7/8 8 1 3/4 6 1 5/16 10 1/16 2 5/16 8 1 11/16
36 6 5/16 1 1/4 4 15/16 8 7/16 1 27/32 6 1 3/8 10 17/32 2 13/32 8 1 13/16
42 7 1 3/8 2 1 9 3/8 2 5 1 1/2 11 11/16 2 11/16 7 2
Note: Applications involving combined axial, parallel and angular movement:
Design Axial Movement
Max. Allowable Axial
Design Lateral Movement +
Max. Allowable Parallel
Design Angular Movement +
Max. Allowable Angular
-1
Movement Movement Movement
5 Convolutions 6 Convolutions
Size Normal Plus or Angular Parallel Normal Plus or Angular Parallel
Length Minus Axial (º Degree) Length Minus Axial (º Degree)
1/2 3 7/32 25/32 45 9/16 3 25/32 15/16 53 11/16
3/4 3 9/32 25/32 41 19/32 3 13/16 15/16 49 11/16
1 3 1/2 27/32 39 5/8 4 1/16 1 45 3/4
1 1/4 3 9/16 27/32 34 5/8 4 5/32 1 1/32 41 3/4
1 1/2 3 5/8 7/8 32 21/32 4 7/32 1 1/32 40 25/32
2 3 3/4 7/8 29 21/32 4 3/8 1 1/16 34 13/16
2 1/2 4 1/4 1 28 3/4 4 15/16 1 7/32 33 29/32
3 4 3/8 1 1/32 25 25/32 5 3/32 1 1/4 30 15/16
4 4 9/16 1 3/32 21 13/16 5 11/32 1 5/16 26 31/32
5 4 27/32 1 5/32 19 7/8 5 5/8 1 3/8 23 1 1/32
6 5 1/32 1 3/16 17 29/32 5 7/8 1 7/16 20 1 3/32
8 5 1/2 1 5/16 15 31/32 6 13/32 1 9/16 18 1 3/16
10 5 15/16 1 13/32 13 1 1/16 6 29/32 1 11/16 16 1 9/32
12 6 3/8 1 17/32 12 1 1/8 7 7/16 1 13/16 14 1 3/8
14 6 23/32 1 19/32 12 1 3/16 7 27/32 1 29/32 14 1 7/16
16 7 11/32 1 3/4 11 1 5/16 8 9/16 2 3/32 13 1 9/16
18 8 1/32 1 29/32 11 1 7/16 9 11/32 2 9/32 13 1 23/32
20 8 5/16 1 31/32 10 1 1/2 9 11/16 2 3/8 12 1 25/32
24 9 5/16 2 7/32 10 1 21/32 10 7/8 2 21/32 12 2
28 10 5/16 2 7/16 10 1 13/16 12 2 15/16 12 2 3/16
30 11 5/16 2 11/16 10 2 13 3/16 3 7/32 12 2 7/16
32 12 1/16 2 7/8 10 2 3/16 14 1/16 3 7/16 12 2 9/16
36 12 5/8 2 27/32 10 2 1/4 14 3/4 3 5/8 12 2 11/16
42 14 3 3/8 8 2 1/2 16 3/8 4 10 3
Page 58
Pressure temperature rating, see page 59
Vacuum temperature rating, see page 60
Demonstrated Movement
Positions for Power-Flex
Normal
Contracted
Angular
Expanded
Lateral
Special note: Up to 10 convolutions available
for increased movement capability. Contact
Thorburn Flexible piping specialist for
details.
Warning: Safety shields must be used at all times in hazardous service to protect against serious personal injury in the event
of expansion joint failure. Liner sleeves must be used in abrasive service or where sharp-edged solids are or may be present.

THORBURN THE FLEXIBLE PIPING SPECIALIST
HOW TO CALCULATE PRESSURE TEMPERATURE
RELATIONSHIP FOR POWER-FLEX TEFLON
EXPANSION JOINT SYSTEM
Pressure temperature ratings (non-shock)
Since PTFE is a thermoplastic its physical properties are sensitive to changes in temperature.
Hence, the bursting pressure of a Power Flex is a function of temperature. In addition, bursting
pressure is related to a number of other variables, such as:
1. Diameter
2. Number of convolutions
3. Rate of pressure application
4. Extent of contraction from normal length
5. Extent of expansion from normal length
6. Degree of angular misalignment
7. Amount of parallel misalignment
8. Magnitude, frequency and duration of cycle vibration
Graph 1 to the right is a curve relating operating temperature to a “Pressure Factor” (F p ). The
shape of this curve is similar to that relating the drop in tensile strength of PTFE with increasing
temperature. The “Pressure Factor” must then be modified by a second factor, “F”, derived
from Table A. F s is a function of pipe size, number of convolutions and style.
The recommended non-shock maximum operating pressure can then be determined by equation.
Equation (1) Pmax = (F p ) X (F s )
If the operating pressure of the system is known and the maximum safe temperature at this
pressure is to be determined, Equation 1 is still applied, using the data from Graph 1 and Table A.
Example: A 6 inch, 5 convolution Power Flex expansion joint is needed for a pipe operating at a maximum pressure of 50 PSI. What is the maximum
safe operating temperature for this Power-Flex expansion joint? From Equation 1:
50 = (1.30) X F p
F p = 38.5
From the curve in Graph 1, the operating temperature at F p = 38.5 is 275ºF.
Table A - Pipe size and number of convolutions function (F s )
Page 59
Graph 1 - Relationship between pressure
factor (F p ) and operating temperature
Pipe Style Number of Convolutions Pipe Style Number of Convolutions
Size 2 3 4 5 6 Size 2 3 4 5 6
1/2
3/4
1
1-1/4
1-1/2
2
2-1/2
3
4
5
Squirm Proof
Standard Power-Flex
2.25
2.25
1.93
1.93
1.87
1.60
1.82
1.25
1.80
1.07
6
Squirm Proof
Standard Power-Flex
2.10
2.10
1.80
1.80
1.77
1.53
1.74
1.30
1.71
1.11
Squirm Proof
Standard Power-Flex
2.25
2.25
1.93
1.93
1.87
1.62
1.82
1.27
1.80
1.10
8
Squirm Proof
Standard Power-Flex
2.04
2.04
1.75
1.75
1.72
1.50
1.69
1.28
1.66
1.10
Squirm Proof
Standard Power-Flex
2.25
2.25
1.93
1.93
1.87
1.63
1.82
1.29
1.80
1.13 10
Squirm Proof
Standard Power-Flex
1.95
1.95
1.72
1.72
1.69
1.45
1.64
1.22
1.64
1.07
Squirm Proof
Standard Power-Flex
2.25
2.25
1.93
1.93
1.87
1.65
1.82
1.31
1.80
1.15 12
Squirm Proof
Standard Power-Flex
1.85
1.85
1.65
1.65
1.61
1.37
1.60
1.19
1.57
1.04
Squirm Proof
Standard Power-Flex
2.25
2.25
1.93
1.93
1.87
1.66
1.82
1.38
1.80
1.19 14
Squirm Proof
Standard Power-Flex
1.78
1.78
1.58
1.58
1.55
1.31
1.53
1.10
1.51
0.94
Squirm Proof
Standard Power-Flex
2.25
2.25
1.93
1.93
1.87
1.67
1.82
1.39
1.8
1.20 16
Squirm Proof
Standard Power-Flex
1.70
1.70
1.53
1.53
1.52
1.20
1.50
0.98
1.48
0.84
Squirm Proof
Standard Power-Flex
2.25
2.25
1.93
1.93
1.87
1.67
1.82
1.39
1.8
1.20 18
Squirm Proof
Standard Power-Flex
1.62
1.62
1.51
1.51
1.49
1.18
1.47
0.96
1.45
0.83
Squirm Proof
Standard Power-Flex
2.25
2.25
1.93
1.93
1.87
1.67
1.82
1.42
1.81
1.18 20
Squirm Proof
Standard Power-Flex
1.54
1.54
1.41
1.41
1.39
1.16
1.38
0.93
1.36
0.80
Squirm Proof
Standard Power-Flex
2.25
2.25
1.86
1.86
1.82
1.58
1.78
1.34
1.75
1.14 24
Squirm Proof
Standard Power-Flex
1.47
1.47
1.34
1.34
1.33
1.15
1.31
0.92
1.30
0.79
Squirm Proof
Standard Power-Flex
2.20
2.20
1.84
1.84
1.81
1.56
1.77
1.33
1.74
1.13 30
Squirm Proof
Standard Power-Flex
1.38
1.38
1.28
1.28
1.27
1.11
1.26
0.87
1.24
0.75

THORBURN THE FLEXIBLE PIPING SPECIALIST
POWER-FLEX VACUUM AND DIMENSIONAL FLANGE DATA
Vacuum rating for Power-Flex teflon expansion joints
The vacuum rating of Power-Flex teflon expansion joints decreases with increasing temperature, diameter and number of
convolutions. Vacuum rings enable Power-Flex through 42” diameter to be rated for full vacuum at temperatures to 400ºF. The
vacuum ring is a metal hoop, inserted into the root of the convolution. Metal selection is based on the customer’s specification.
Tantalum, Hastelloy, Monel, stainless steel, Nickel and Zirconium vacuum rings have been used to date. Also available PTFE
coated.
Maximum temperature (ºF) for full
vacuum service (without vacuum rings)
Dia. Number of Convolutions
(in.) 2 3 4 5 6
1 400 400 400 400 400
1.5 400 400 400 400 400
2.5 400 400 400 400 400
3 400 400 400 400 400
4 400 350 350 350 300
5 400 350 350 300 250
6 350 300 275 250 200
8 300 250 200 150 100
10 250 200 150 100 —
12 150 150 100 — —
14 100 — — — —
Consult Thorburn for vacuum rating on vacuum rings above 14” diameter.
--: Use vacuum rings for full vacuum service.
Notes: 1) When vacuum rings are used with any Power-Flex 3” diameter
and larger, a full vacuum rating to 400ºF is obtained. 2) Please consult
Thorburn for data on partial vacuum applications.
Special drilling
ANSI 150 lb. is standard drilling for Power-
Flex flanges. Thorburn can readily supply any
flange drilling (Corning, DIN, 300 lb.,
clearance holes, etc.). Power-Flex expansion
joints are carried in stock with ANSI 150 lb.
drilling, and a combination of ANSI 150 lb.
drilling with Corning drilling. Please consult
Thorburn for any non standard drilling you
may require.
Page 60
Power-Flex with vacuum rings in place
A B C E F G H
Power Flare Flange PTFE Flange Number Bolt
Flex Face Outside Inside Thickness of Thread Circle
Size (in.) Dia. (in.) Dia. (in.) (in.) Holes (in.)
0.5 1.38 3.50 0.56 0.38 4 0.5 x 13 2.38
0.75 1.69 3.88 0.81 0.38 4 0.5 x 13 2.75
1 2.00 4.25 1.00 0.41 4 0.5 x 13 3.13
1.25 2.50 4.63 1.38 0.41 4 0.5 x 13 3.50
1.5 2.88 5.00 1.63 0.44 4 0.5 x 13 3.88
2 3.63 6.00 2.06 0.44 4 .63 x 11 4.75
2.5 4.13 7.00 2.44 0.50 4 .63 x 11 5.50
3 5.00 7.50 3.06 0.53 4 .63 x 11 6.00
4 6.19 9.00 4.00 0.56 8 .63 x 11 7.50
5 7.31 10.00 5.06 0.56 8 .75 x 10 8.50
6 8.50 11.00 6.06 0.59 8 .75 x 10 9.50
8 10.63 13.50 8.00 0.69 8 .75 x 10 11.75
10 12.75 16.00 10.00 0.69 12 .88 x 9 14.25
12 15.00 19.00 11.94 0.75 12 .88 x 9 17.00
14 16.25 21.00 13.13 0.81 12 1 x 8 18.75
16 18.50 23.50 15.00 0.88 16 1 x 8 21.25
18 21.00 25.00 16.88 0.94 16 1.13 x 7 22.75
20 23.00 27.50 18.81 1.00 20 1.13 x 7 25.00
24 27.25 32.00 22.63 1.13 20 1.25 x 7 29.50
28 31.25 36.50 26.44 1.25 32 1.25 x 7 34.00
30 33.75 38.75 28.00 1.38 28 1.25 x 7 36.00
E
A B
C
F holes tapped
G on H circle

THORBURN THE FLEXIBLE PIPING SPECIALIST
Cable-limit Power-Flex: Offers maximum
flexibility and permits installation where
mating pipe is not aligned.
Squirmproof Power-Flex:
Increases working pressure
for multi-convolution
applications.
POWER-FLEX TYPICAL STYLES
Limitbolt Power-Flex:
Conventional limit bolt
design.
Safety shield “PS”: Photograph shows
PTFE fabric safety shield prior to installation
over Power-Flex and mating flanges.
WARNING Specify
maximum continuous pressure
and temperature with
all part numbers
EXAMPLES
1) Power-Flex 8” diameter, 4 convolutions, 150 lb. ANSI, drilling with cable limits PTFE liner and safety shield. The ordering code would be: P8 DIPA-4-PS
2) Power-Flex 20” diameter, 5 convolutions, one flange 150 lb. ANSI – one flange clearance holes with limitbolts, carbon steel flanges and Titanium vacuum
rings. The ordering code would be: 20 COBA-4-S2. 1) Titanium vacuum rings. 2) One flange 150 lb. ANSI – one flange clearance holes.
Page 61
Power-Flex liner system
Use a liner in a Power-Flex as shown
below when:
1. Abrasives are present
2. Metallic or other sharp-edged
particles are or may be present
3. Fluid velocity is high
4. Fluid holds solids that might settle
out in convolution
Power-Flex top hat liner system
WARNING: Safety shields must be used at all times in hazardous service to protect against serious personal injury in the event of expansion
joint failure. Liner sleeves must be used in abrasive service or where sharp-edged solids are or may be present.
How to order Power-Flex teflon expansion joints system
Power-Flex Size Flange Mat. Axial Restraint Liner Drilling # convolutions # of specials Safety shield
P 8 D I P A 4 S2 PS
D = Ductile iron
C = Carbon steel
F = FRP
S = Stainless steel
I = Cable limit
O = Limit Bolts
U = Squirmproof
B = Non liner
P = PTFE liner
S = Stainless steel
A = Standard 150 lbs. ANSI
O = Corning
E = Clearance holes
S = Other
Suffix PS

THORBURN THE FLEXIBLE PIPING SPECIALIST
TEF-FLEX MOULDED PTFE EXPANSION JOINTS
Thorburn’s Tef-Flex, is a moulded PTFE expansion joint which has
been specifically designed for piping systems requiring the transfer
of corrosive medias at higher pressures and temperatures. Thorburn’s
Tef-Flex provides tremendous flex life and unmatched reliability.
The virgin unpigmented properties of Tef-Flex increase its physical
properties, adding strength, impermeability and stability at high temperatures.
Only known chemicals to react with Tef-Flex are molten
alkali metals, liquid or gaseous florine.
WARNING: Operating Tef-Flex at conditions beyond pressure
temperature curve may result in premature failure and/
or rupture thus causing property damage or personal injury.
Page 62
■ Dependability under adverse conditions
■ Chemically inert and impervious to acids, solvents,
caustics and oxidizers
■ Available in sizes from 1” to 24”
■ Temperature ranging from -300ºF to 400ºF
Tef-Flex operating curve pressure / Vacuum vs temperature
PRESSURE
Available with
2, 3 or 5 convolutions
Burst pressure
4 times
working pressure
Thorburn’s skilled flexible piping
specialists installing a PTFE liner to the
Tef-Flex bellows
VACUUM
Please consult Thorburn Engineering if pressures and
temperatures exceed those shown above.

THORBURN THE FLEXIBLE PIPING SPECIALIST
TEF-FLEX MOVEMENT, WEIGHT AND
LINER LENGTH DATA
COMPRESSED EXPANDED
Nominal
Pipe
Size
Model
Number
ANGULAR MISALIGNMENT PARALLEL MISALIGNMENT
Special notes: 1) Maximum travel is based on installation with no misalignment or angular deflection. 2) Maximum misalignment is based on installation with no travel
or angular deflection. 3) Combined travel and misalignment are proportionately lower for each type of deflection according to the percentage of the “Maximum” that is
required for the other. 4) 5 convolution joints also available to provide increased movement capabilities.
How to order
Model TF2 (2 convolutions) - Non-concurrent Model TF3 (3 convolutions) - Non-concurrent
Movement (in.) Movement (in.)
Neutral
Length
(in.)
Model # Liner (option) Special
4TF2 L S
L = PTFE
LM = Metal liner
± Max
Travel
Specify
Angular
Degrees
(º)
± Max.
Misalignment
(in.)
Shipping
Weight
(lbs)
Liner
Length
(in.)
Page 63
Model
Number
Neutral
Length
(in.)
± Max
Travel
Angular
Degrees
(º)
± Max.
Misalignment
(in.)
Shipping
Weight
(lbs)
1.5 1.5TF2 2.00 0.25 19 0.13 3.00 2.50 1.5TF3 2.75 0.50 34 0.25 3.00 3.50
2 2TF2 2.50 0.38 21 0.13 8.50 3.13 2TF3 3.25 0.50 28 0.38 8.50 4.00
2.5 2.5TF2 2.50 0.38 17 0.13 11.25 3.13 2.5TF3 3.25 0.50 22 0.38 11.25 4.00
3 3TF2 2.50 0.38 14 0.13 19.50 3.13 3TF3 3.25 0.50 20 0.38 19.75 4.00
4 4TF2 3.00 0.50 14 0.25 25.75 3.75 4TF3 4.00 0.75 20 0.5 26.00 5.00
5 5TF2 3.00 0.50 11 0.25 27.50 3.75 5TF3 4.00 0.75 12 0.5 28.00 5.00
6 6TF2 3.00 0.50 10 0.25 27.50 3.75 6TF3 4.00 0.75 14 0.5 28.00 5.00
8 8TF2 3.00 0.50 7 0.25 48.00 3.75 8TF3 4.00 0.75 14 0.5 48.50 5.00
10 10TF2 3.75 0.75 7 0.25 67.00 4.75 10TF3 5.00 1.00 12 0.63 68.50 6.25
12 12TF2 3.75 0.75 6 0.25 95.50 4.75 12TF3 5.00 1.00 10 0.63 96.75 6.25
Pipe
Size
(in.)
No. of
Holes
Liner
Length
(in.)
Shown are
standard
dimensions. Other
flange drilling
available upon
request
ASA Standard Holes Corning Style II Holes C D E
Thread Bolt
Circle
(in.)
No. of
Holes
Thread Bolt
Circle
(in.)
1.5 4 .5 - 13 3.88 4 .31 - 18 3.88 5 2.75 0.38
2 4 .63 - 11 4.75 4 .31 - 18 4.75 6 3.5 0.44
2.5 4 .63 - 11 5.5 4 .31 - 18 5.5 7 4 0.5
3 4 .63 - 11 6 4 .31 - 18 6 7.5 5 0.69
4 8 .63 - 11 7.5 8 .31 - 18 7.5 9 6 0.69
5 8 .75 - 10 8.5 8 .38 - 16 8.5 10 7 0.69
6 8 .75 - 10 9.5 8 .38 - 16 9.5 11 8 0.69
8 8 .75 - 10 11.75 — — — 13.5 10.25 0.88
10 12 .88 - 9 14.25 — — — 16 12.25 1
12 12 .88 - 9 17 — — — 19 14.5 1
Flange
O.D.
(in.)
Flare
Face
(in.)
Flange
Thickness
(in.)

THORBURN THE FLEXIBLE PIPING SPECIALIST
“THOR-SHIELD” SAFETY SHIELDS
PROTECTION FOR HAZARDOUS CONTAINMENT
Thorburn recommends “Thor-Shield” to be used in all applications involving hazardous
service. Use Thor-Shield and contain spray-out of conveyed liquid in the event of
expansion joint failure.
Tef-Flex recommended installation procedures
DO’S
Inspect for damage during shipment, i.e. dents, broken hardware,
water marks on carton, etc.
Store in clean dry area where it will not be exposed to heavy
traffic or damaging environment.
Use only designated lifting lugs.
It is good practice to leave one flange loose until the expansion
joint has been fitted into position. Make necessary adjustment of
loose flange before welding.
Install joint with arrow pointing in the direction of flow.
Install single Van Stone liners pointing in the direction of flow.
Be sure to install a gasket between the metallic liner and Van Stone
flange as well as between the mating flange and liner.
With telescoping Van Stone liners, install the smallest I.D. liner
pointing in the direction of flow.
Remove all shipping devices after the installation is complete and
before any pressure test of the fully installed system.
Remove any foreign material that may have become lodged
between the convolutions.
Refer to EJMA Standards for proper guides.
Tef-Flex Torque Values
Page 64
Thorburn part number TSS
(To order, add suffix TSS to
expansion joint part number)
IPS Torque IPS Torque IPS Torque
Ft.-Lbs. Ft.-Lbs. Ft.-Lbs
1 10 4 30 14 70
1 1/2 15 6 45 16 65
2 25 8 60 18 90
2 1/2 30 10 50 20 80
3 40 12 60 24 90
Special note: After 24 hours, or one temperature/pressure cycle, all bolts should be checked. Those falling below the minimum torque must be
retorqued.
Thorburn Teflon Expansion Joints’ Installation Considerations
WARNING: Thorburn’s warranty will be void if improper
installation procedures have been used.
DON’TS
Do not drop or strike carton.
Do not remove shipping bars until installation.
Do not use hanger lugs as lifting lugs without approval of
manufacturer.
Do not use chains or any lifting device directly on the bellows or
bellows cover.
Do not allow weld spatter to hit unprotected bellows.
Protect with wet chloride-free asbestos.
Do not use cleaning agents that contain chlorides.
Do not use steel wool or wire brushes on bellow.
Do not make the piping system fit the expansion joint by stretching,
compressing or offsetting the joint to fit the piping, it may be
overstressed when the system is in service.
Do not force-rotate one end of an expansion joint alignment of
bolt holes. Ordinary bellows are not capable of absorbing torque.
Do not hydrostatic pressure test or evacuate the system before
proper installation of all guides and anchors.
Pipe hangers are not adequate guides.
Do not exceed a pressure test of 1-1/2 times the rated working
pressure of the expansion joint.
Do not use shipping bars to retain the pressure thrust if tested prior
to installation.

THORBURN THE FLEXIBLE PIPING SPECIALIST
HOW TO
ORDER
HOT-FLEX “HF”
HEAVY DUTY TEFLON LINED METAL EXPANSION JOINT SYSTEM
Thorburn Hot-Flex
expansion joint system
combines the
properties of metal
and teflon into the
most advanced and
versatile expansion
joint available in the
world today
Page 65
Thorburn’s Hot-Flex expansion joint system is an engineered
product that was specifically designed to provide high
pressure/temperature transfer containment of highly corrosive
medias that could not be safely handled by conventional
metallic, elastomeric or teflon expansion joints.
Thorburn’s Hot-Flex combines the high pressure rating of a
metallic expansion joint with the high temperature corrosion
resistance of teflon, creating a product that will outperform
them both.
Engineering data shown is just a sample of Thorburn’s Hot-
Flex capabilities. Each Hot-Flex expansion joint can be custom
engineered to your specific application: pressure/temperature
rating, spring rate movement (axial, lateral and angular),
metallic carcass (stainless steel, monel, inconel, hasteloy, etc.),
various lengths.
Typical Design Movements and Force Specifications - Shown to 24” - Available up to 120” ID
Thorburn
Part
Number Diameter
Neutral
Length
Net Weight
(lbs)
PTFE Liner Thicknesses 1/8” thick
Non-Concurrent Movement Spring Rate
Axial
Compression
HF1.5 #C-FM-XX 1.5 7.00 18 0.69 0.44 0.25 14 38 60 0.60
HF2 #C-FM-XX 2 8.00 20 0.69 0.44 0.25 14 42 65 0.54
HF3-#C-FM-XX 3 9.00 27 0.87 0.56 0.25 10 43 79 1.08
HF4-#C-FM-XX 4 10.00 36 0.87 0.56 0.31 10 62 71 3.28
HF6-#C-FM-XX 6 12.00 51 1.75 1.12 0.62 12 66 100 6.25
HF8-#C-FM-XX 8 12.00 73 1.94 1.25 0.56 10 99 78 18.00
HF10-#C-FM-XX 10 14.00 96 2.12 1.31 0.62 10 82 368 22.00
HF12-#C-FM-XX 12 16.00 138 2.12 1.31 0.56 10 195 953 55.00
HF14-#C-FM-XX 14 16.00 165 2.12 1.31 0.56 10 209 562 79.00
HF16-#C-FM-XX 16 16.00 239 2.12 1.31 0.69 10 154 912 78.00
HF18-#C-FM-XX 18 16.00 280 2.25 1.44 0.75 10 222 1082 135.00
HF20-#C-FM-XX 20 16.00 343 2.25 1.44 0.62 10 309 1537 191.00
HF24-#C-FM-XX 24 16.00 390 2.25 1.44 0.50 8 326 1888 281.00
Notes: 1) #C = number of convolutions, i.e. 10C (Thorburn to specify)
2) FM = Flange type and material i.e. V = vanstone; F = fixed
Flange material codes: C = Plated carbon steel, S4 = Plated SS304
S6 = Plated SS316 Other: specify XX = Standard drilling #150
Accessories
Model Size OAL Convolutions Flange Rod & Flange XX=Specify design
(in.) (in.) Type/Material Material pressure psi & temp. F.
HF 12 16 10C FC AC 50/212
Note 1 Available in different lengths for increased movement capabilities.
Note 2 Rods and flanges also available in stainless 304SS, 316SS, inconel, hasteloy, monel. Also teflon coated for special externally corrosive applications. Call
Thorburn for details.
Note 3 Also available with other drilling patterns: 300, DIN, JIS, British standard, etc. Please specify requirement.
Note 4 Always specify required design pressure and temperature requirements.
Note 5 Available in sizes up to 120”.
Axial
Extension
Lateral (±)
Angular (deg.)
Axial
(lbs. per 1/8 in.)
Lateral
(lbs. per 1/8 in.)
Angular
(ft. lbs. per deg.)

THORBURN THE FLEXIBLE PIPING SPECIALIST
HOT-FLEX “HF” CONSTRUCTION DETAILS
Hot-Flex PTFE or FEP teflon tube formed into a
stainless steel, inconel, monel or hasteloy corrugated
tube.
Flanges: Floating type (150#, 300# or metric).
Available in carbon steel, stainless steel or teflon
coated to meet your specific requirements.
Options: Gimbal-hinged-dual-externally pressurized-pressure
balanced.
Working temperatures: from -300ºF to +400ºF.
Working pressures: 50 - 150 - 300 psi available
(please specify).
Page 66
Absorbs pipe movements
and stress
Isolates mechanical
vibration
Reduces system noise
Protects against surge
forces
Note: For environmentally corrosive
applications, laminated elastomeric
or teflon covers available
DANGER: Thor-Shields must be used at all times in hazardous service to protect against serious personal injury in the event of expansion joint failure.
Thorburn internal liners must be used in abrasive service or where sharp-edge solids are or may be present.
1. SAFETY
Is fluid hazardous? Yes ❏ No ❏
Are abrasive solids present? Yes ❏ No ❏
(If yes to any of those questions, a Thor-Shield must be used)
2. FLUID PROPERTIES
Medium
Velocity
3. MATERIALS OF CONSTRUCTION
Metallic carcass
Flanges
Internal liner (if required)
4. EXPANSION JOINT FEATURES
Size in. nominal diameter
Internal liner Yes ❏ No ❏
Safety shield Yes ❏ No ❏
7. DESIGN PARAMETERS
HOT-FLEX REQUIRED SPECIFICATION DESIGN DETAILS
Installation position
Up ❏
Horizontal
Flow
Vertical
Down ❏
Installed length in.
Flange drilling lb.
5. MARKING: CONDITIONS NOT TO BE EXCEEDED
Pressure test psig. @ ºF
Operating pressure psig @ ºF
Axial movement in.
Lateral movement in.
Angular movement in.
Angular movement degrees
Are limit bolts to be factory set to eliminate pressure thrust?
Yes ❏ No ❏
6. SPRING RATE REQUIREMENTS IF APPLICABLE
Axial lbs./in.
Lateral lbs./in.
Angular ft.-lbs./degree
Condition Pressure Vacuum Temp. MOVEMENTS*
(psig) (in., Hg.) (ºF) Axial (in.) Lateral (in.) Angular (deg.)
Testing
Installation
Tolerance
Normal
Operation
Cold Weather
Shutdown
Design

THORBURN THE FLEXIBLE PIPING SPECIALIST
BALLAST WATER SECONDARY CONTAINMENT
EXTERNALLY PRESSURIZED EXPANSION JOINT SYSTEM
Hibernia offshore developmental project used
Thorburn’s flexible piping technology to provide
external pressure containment, stress and movement
absorption on its permanent ballast water containment
piping system over 80 meters under the
Atlantic Ocean, off the East coast of Newfoundland
Patented and Patent Pending
ADVANTAGES
■ Contains over 200 psi external or
internal pressure differential
■ Absorbs pipe movement and stress
■ Protects against surge forces
■ Isolates mechanical vibration
■ Sea water resistant
225 PSI EXTERNAL
PRESSURE DESIGN
Thorburn is the only manufacturer
of rubber expansion joints in the
world who has designed, built and
tested its elastomeric expansion
joints for external pressure up to
225 psi (1052 kPa), in sizes up to
and including 28” (111 mm) diameter.
This proprietory design was
developed for one of the world’s
largest offshore oil rigs, Hibernia,
situated off the coast of St.John’s
Newfoundland, Canada.
Thorburn’s Model 42HP-HDX being assembled, ready for external testing.
Thorburn proprietary system was successfully tested in the pressure chamber on
the right to 225 psi external pressure.
Thorburn Basic Number Nominal Arches Face
Non-Concurrent Movement
Axial Weight
Size (in.) to face Compression Extension Lateral (lbs)
42HPHDX-24S-XY 24 Single 14 1.5 0.75 0.75 225
42HPHDX-24D-XY 24 Double 18 3.0 1.5 1.5 250
42HPHDX-24T-XY 24 Triple 22 4.5 2.25 2.25 275
42HPHDX-26S-XY 26 Single 14 1.5 0.75 0.75 250
42HPHDX-26D-XY 26 Double 18 3.0 1.5 1.5 275
42HPHDX-26T-XY 26 Triple 22 4.5 2.25 2.25 300
42HPHDX-28S-XY 28 Single 14 1.5 0.75 0.75 275
42HPHDX-28D-XY 28 Double 18 3.0 1.5 1.5 300
42HPHDX-28T-XY 28 Triple 22 4.5 2.25 2.25 325
XY = Tube / Cover elastomer Other sizes available upon request Bolt pattern to suit mating flange requirements
Page 67
Rubber
codes
(XY)
AC
CC
DC
FC
HC
HH
Tube/Cover Elastomer Codes
Tube
Natural
Neoprene
Nitrile
Hypalon
EPDM
EPDM
Material
Cover
Neoprene
Neoprene
Neoprene
Neoprene
Neoprene
EPDM
Max. Op.
Temp. ºF
180
225
225
212
225
250

THORBURN THE FLEXIBLE PIPING SPECIALIST
FLEXI-DUCT SERIES
FDR Elastomeric and FDC Composite ducting expansion joint system
Pressures to ± 3 psi
Available in round or rectangular profiles
Model FDR: Elastomeric for ducting temperatures
below 400ºF
Model FDC: Composite type for ducting temperatures
above 400ºF
Thorburn’s Flexi-Duct Series FDR & FDC are non-metallic ducting
expansion joints that are custom built and designed to provide stress
relief in ducting systems by absorbing movement caused by thermal
changes. Thorburn Flexi-Duct expansion joints also act as vibration
isolators, shock-absorbers and make up for minor misalignments.
1. Gas Seal Flexible Membrane
Flexi-Duct Typical Expansion Joint Components
Thorburn Flexi-Duct gas seal flexible membrane is designed to
withstand system pressure and be resistant to chemical attack from
the interior and the exterior. The gas seal must also have the
flexibility to absorb thermal movements. Depending on the system
temperature, it may or may not require additional thermal
protection.
2. Insulating Layers
Thorburn Flexi-Duct insulating layers provide a thermal barrier
to ensure that the inside surface temperature of the gas seal membrane
does not exceed its maximum service temperature. The insulating
layer can also reduce condensation caused by the gas
stream coming in contact with the “cool” surface of an uninsulated
gas seal membrane.
3. Insulating Retainer Layer
This layer is provided solely to keep the insulating layers in place
in order to maintain thermal integrity. The retaining layer must be
capable of withstanding gas stream temperatures and must be
chemically compatible with system media.
Page 68
4. Back-Up Bars
Thorburn Flexi-Duct backup bar, positioned at the flange attachment,
uses clamping pressure to create the fabric-to-duct seal and restrains
the fabric when it is subjected to the system pressure. The thickness
and width of Thorburn’s backup bar should be sufficient to perform
this function with the bolt spacing being used. The edges of Thorburn’s
backup bar have a radius to preclude cutting of the fabric.
5. Metal Liner or Baffle
Thorburn Flexi-Duct liner is designed to protect the gas seal membrane
and insulating layers of the flexible element from abrasive particles
which may be present in the gas stream. A liner is also used to
reduce flutter of the fabric element caused by turbulence, to help control
the accumulation of dust or ash in the expansion joint cavity and
to reduce the temperature of the flexible element.
6. Fly ash Barrier
Thorburn Flexi-Duct fly ash barrier system is intended to deter fly
ash from building up in the expansion joint cavity. It is typically used,
in conjunction with a liner, in duct runs from boilers to air clean-up
equipment such as precipitators, scrubbers and bag houses, or whenever
high amounts of dust or ash are present in the gas. A fly ash
barrier must be capable of retaining its strength and flexibility while
being exposed to maximum system temperatures and media.
7. Fabric Attachment Flanges
Thorburn Flexi-Duct attachment flanges are required to connect the
flexible element to the ductwork. Properly designed, they can be attached
directly to the duct work and thus eliminate the necessity for
an adjoining duct flange. Thorburn Flexi-Duct flanges can be designed
with a “landing bar” duct attachment which allows some installation
misalignment without affecting the flexible element. The
flanges establish the stand off height of the fabric, which is necessary
to achieve thermal integrity during all movement conditions.

THORBURN THE FLEXIBLE PIPING SPECIALIST
BENEFITS
WHY USE THORBURN NON-METALLIC
FLEXI-DUCT EXPANSION JOINT SYSTEMS
■ Lower System Design Costs: Since Flexi-Duct expansion joints can
accommodate all of the types of movements concurrently, the resultant
system cost can be reduced as follows:
The number of total expansion joints may be reduced to take advantage
of the large, multi-plane movements.
The same movements can be derived in shorter face-to-face
dimensions than metal expansion joints.
The system geometry can be simplified.
The use of costly toggles, hangers, support structures and guides can
be extensively reduced.
The engineering time required to design the system is significantly
reduced.
■ Low Material Costs: The use of high alloy metals may not be required
to meet the corrosion resistance required by the application. The variety of Flexi-Duct elastomers and plastics available will allow
the selection of the precise, least expensive material.
■ Lower Shipping and Installation Costs: Flexi-Duct non-metallic expansion joint can be factory pre-assembled and shipped to
the jobsite for ease of installation. Flexi-Duct expansion joints are relatively light weight and can be hoisted into place with a
minimum of field assembly required.
■ No Gaskets Required: Since most installations are either welded into place or use integral rubber flanges, the use of gaskets may
not be required (For those installations utilizing metal flanges bolted into place, gaskets will be required.).
■ Lower Replacement Cost: Changing Flexi-Duct non-metallic expansion joints can be done with a minimum of downtime. The
expansion joint can be provided either factory spliced or open ended for field splicing.
FEATURES
■ Large Movements: Flexi-Duct non-metallic expansion joint offers multi-plane movements in
a shorter face-to-face dimension. The ability to accommodate axial, lateral (in two planes),
torsional and angular movements concurrently is an inherent capability of the non-metallic
expansion joint designs.
■ Low Loads: The spring rates generated by the movements or required to move the expansion
joints are very low.
■ Corrosion Resistance: Flexi-Duct non-metallic expansion joint’s use of the wide variety of
elastomers, fabrics and plastics allows the selection of the correct materials for each application.
The superior corrosion resistance of Flexi-Duct rubbers and plastics can extend the life of
the expansion joint.
■ Sound and Vibration Elimination: The outstanding vibration and sound attenuation
characteristics of Flexi-Duct elastomers help
prevent premature system degradation.
■ High Temperature: With the use of special
materials, Flexi-Duct non-metallic expansion
joints can withstand over 1000 degrees
Fahrenheit operating temperatures.
Thorburn Flexi-Duct is
custom designed for air and
gas ducting systems
Page 69
Thorburn Flexi-Duct expansion joints are a practical and
economical solution that is indivudually designed to meet
the specific requirements of each application
Chemical and Temperature
Resistance for Design Conditions
Temperature -100ºC to +1000ºC
-150ºF to 1850ºF
Pressure ± 3 psi

THORBURN THE FLEXIBLE PIPING SPECIALIST
FLEXI-DUCT SERIES FDR & FDC
APPLICATIONS
Increasing environmental considerations have resulted in rigid regulations on stack gas emissions for power generating and industrial
facilities. Therefore, layouts for dust removal and gas scrubbing equipment have required increasingly complex duct work systems.
The complexity of these new systems have provided Thorburn with the need to design and develop the world’s most technologically
advanced ducting expansion joint systems to solve problems created by the thermal and mechanical stresses developed in the ducting
and associated equipment. Thorburn’s Flexi-Duct type expansion joints are being specified by designers and operators of large flue
gas and combustion air systems for power generating stations and industrial plants.
Powerplant ducting with long runs, multiple air or gas paths and high temperatures, are extremely demanding on Thorburn metallic and nonmetallic
expansion joints
SYSTEMS
Gas turbine exhausts
Low pressure process gas and air
Exhaust gas and air
Heat recovery
Air pollution and fume control
Expansion joint
installed on the outlet
flange of a gas turbine
Custom-engineered round
expansion joints ready for
shipment
Scrubber
Precipitator
Baghouse
Stack hot air
Flue gas duct
Page 70
INDUSTRIES
Refineries
Cement plants
Pulp & paper mills
Food processing plants
Chemical plants
Petrochemical plants
Typical Flexi-Duct Non-Metallic
Expansion Joint Applications
Flexi-Duct expansion joint can be
designed for high temperature
service up to 1800ºF
Typical Flexi-Duct
radius corner
Steel mills
Foundries
Smelters
Marine
Incinerators
Power generation
Vertical expansion joint
located between
precipitator and stack

THORBURN THE FLEXIBLE PIPING SPECIALIST
FLEXI-DUCT SERIES
FDR Elastomeric and FDC Composite Ducting Expansion Joint Systems
DESIGNS
Thorburn’s Flexi-Duct expansion joint designs will fall into two basic
types; elastomeric FDR or composite FDC. Within the two basic
types, Flexi-Duct is manufactured either in a belt or integral moulded
flange design (please see sketches on the right).
An important consideration in selecting Thorburn’s Flexi-Duct
expansion joint is the system temperature. In general, there are two
classifications: those operating under 400ºF (typically elastomeric)
and those operating above 400ºF (typically composite).
TYPICAL FLEXI-DUCT CONSTRUCTION ELEMENTS
Elastomers: Are used to provide gas sealings of the ducting
media.
Fabrics: Are used to provide pressure containment of the
ducting system. In addition, fabrics are used for
inner and intermediate layers in composite style
joints as thermal barriers and mechanical
reinforcement. The selection of fabrics is based
upon compatibility with the specific thermal,
chemical and mechanical requirements of the
system.
Insulating layers: Are designed to reduce interface temperatures to
a level which permits satisfactory performance
and life of the fabrics and gas seal membrane.
Fiberglass blankets perform well to 1000ºF and
ceramic blankets perform well to 1800ºF, but do
have mechanical and chemical limitations.
Liners and barriers: Are designed to protect the expansion joint
against system mechanical damages such as
erosion or abrasion.
Page 71
MATERIALS USED IN THORBURN’S FLEXI-
DUCT NON-METALLIC EXPANSION JOINTS
The performance of Thorburn’s Flexi-Duct non-metallic
expansion joints for various gas ducting systems is
determined by the severity of the environment and by
the selection of the materials for each component of the
expansion joint. Selection of materials must be based on
both operating temperature and chemical resistance. A
corrosive atmosphere that might not have a noticeable
effect at low temperature could have a disastrous effect
at higher temperatures still within the basic heat resistance
capability of the material. Conversely, systems at or below
the dew point can result in highly corrosive condensates.
The proper selection of materials will endure long term
performance of Thorburn’s non-metallic expansion joints
in even the most adverse ducting system environment.
SINGLE PLY
DESIGN
DOUBLE PLY
DESIGN
For pressures up to ± 2 psi
For pressures up to ± 3 psi
Typical High Temperature Flexi-Duct
Composite Construction
Nominal 250°F. (120°C,)
Approximately
140°F. (60°C,)
Nominal 1850° F. (1000° C,)
Maximum 1300° F. (700° C,)
Maximum 930° F. (500° C,)

THORBURN THE FLEXIBLE PIPING SPECIALIST
FLEXI-DUCT ENGINEERING DESIGN CONCEPTS
■ FLANGE HEIGHT AND SETBACK
The Setback (Stand-off Height)
This is the distance to which the expansion joint
(flexible element) is moved outward from the gas
stream to allow for lateral movements and to prevent
the joint from protruding into the gas stream or rubbing
on the baffle when operating under negative pressures.
Proper setback also reduces the thermal transfer effect
on the inner face of the expansion joint and prevents
abrasion from particles in the gas stream. Consult
Thorburn for their recommended setback.
The Flange Height
The standard flange height for the elastomeric type is
3 inches. Variations are available to meet certain
applications.
Overall Duct Flange Height
To determine overall mating duct flange heights, expansion joint flange height plus Thorburn’s recommended setback
must be considered. To accommodate deviations from standard dimensions, custom modifications to standard sizes
are available. Consult Thorburn for details.
Typical examples of flange setback and calculation of flange outside diameter
Page 72
■ BOLT SPACING
In order to properly seal the expansion joint at the duct
flange, all flange bolt holes spacing is standardized at a
four inch or six inch center-to-center distance. Holes
are typically slotted, but round holes are available.
Bolt size Flange bolt hole spacing
1/2” 4 inch C-C
5/8” 4 or 6 inch C-C
A “corner hole” is required on all rectangular
expansion joints

THORBURN THE FLEXIBLE PIPING SPECIALIST
FLEXI-DUCT ENGINEERING DESIGN CONCEPTS
■ MOVEMENTS
The face-to-face dimension of Thorburn’s Flexi-Duct
expansion joint, as installed, is a major design consideration.
In general, an increased face-to-face dimension results in
greater movement capabilities.
Three dimensional system movements can occur five ways
and in any combination. They are outlined below.
A Axial Compression: The dimensional shortening of the
expansion joint face-to-face gap parallel to its longitudinal
axis.
B Axial Extension (elongation): The dimensional
lengthening of the expansion joint face-to-face gap parallel
to its longitudinal axis.
C Lateral: The dimensional displacement of the inlet and
the outlet flanges of the expansion joint perpendicular to
its longitudinal axis.
D Torsional rotation: The twisting of one end of the expansion joint with respect to the other end about its longitudinal axis.
E Angular rotation: That movement which occurs when one flange of the expansion joint is moved to an out-of-parallel position
with the opposite flange.
■ BACK-UP AND CLAMPING BARS
Page 73
TYPICAL MOVEMENT CAPABILITIES
Belt Breach
Span/ Opening/
Belt free Installed Axial Axial Lateral
length length compression extension deflection
6 5-1/2” 1” 1/2” ± 1”
9 8-1/2” 2” 1/2” ± 2”
12 11” 3” 1” ± 3”
16 15” 4” 1” ± 4”
The movements shown are representative of a movement occuring in any
direction from the true centerline of the expansion joint. Greater
movement can be accommodated by pre-offsetting the duct-work opposite
the anticipated movement.
These are metal bars used for the purpose of clamping the Flexi-Duct expansion joint to the mating ductwork flanges or clamping
the fabric portion of a belt-type expansion joint to the metal adapter flanges.
Standard back-up bar sizes are 3/8” x 2” and 3/8” x 1-1/2”; other sizes may be available. Back-up bar selection depends upon the bolt
spacing, bolt hole size and expansion joint flange height.
Other forms of clamping bars include “L” shapes, channels and bars with clamp strips on the clamping surface.
To prevent damage to the Flexi-Duct expansion joint, Thorburn removes all sharp edges from the back-up bars which may come into
contact with the flexible element by grounding smooth to a radius.

THORBURN THE FLEXIBLE PIPING SPECIALIST
FLEXI-DUCT DESIGN CONSIDERATIONS
SYSTEM TEMPERATURE
Insulation and Condensation Within the Ducting
High temperature ducting systems are frequently insulated to
conserve energy and help prevent internal condensation and
corrosion of the ducting. Properly designed expansion joint
elements meet these criteria. Poorly designed components will
WHEN THE MAXIMUM CONTINUOUS SYSTEM OPERATING TEMPERATURE (MCSOT) IS NEAR THE GAS DEW POINT AND
LESS THAN THE ALLOWABLE SERVICE TEMPERATURE OF THE GAS SEAL MEMBRANE MATERIAL:
GOOD DESIGN
Dew Point Composite “Belt Style”
Flow
■ Expansion joint flexible element is fully insulated to conserve energy,
yet easily accessible for inspection and replacement.
Single Ply “Belt Style”
Flow
Page 74
promote problems. The following examples help illustrate correct
design methods for expansion joints and ducting insulation.
Insulating Layers
The thermal barrier of a multilayer fabric element must resist
heat, moisture and acid attack. Additional retaining layers must
be made of materials which remain strong and flexible when
exposed to high temperatures and acids or condensates resulting
from operation at or below the dew point.
POOR SELECTION OF MATERIALS
Single Ply Gas Seal Membrane
■ Ducting and expansion joint are not properly insulated.
■ Severe condensation is possible.
■ Costly heat energy is lost.
Misapplication of a “hi-temp” composite belt causes:
■ Ducting and expansion joint are not properly insulated.
■ Severe condensation is possible.
■ Costly heat energy is lost.
WHEN THE MAXIMUM CONTINUOUS SYSTEM OPERATING TEMPERATURE (MCSOT) EXCEEDS THE ALLOWABLE SERVICE
TEMPERATURE OF THE GAS SEAL MEMBRANE MATERIAL:
GOOD DESIGN
Outer gas seal membrane
POOR SELECTION OF MATERIALS AND
Retainer layer
High temperature
composite belt to
4” min.
900ºF MCSOT
Flow
6” min.
■ Minimizes heat loss and permits optimum cooling of the gas seal membrane
■ Flange standoff reduces the temperature of the belt and the critical
attachment area, thereby maximizing service life.
Extreme hi-temp
construction to
1200ºF MCSOT
Permanent duct
insulation by others
Outer weather ply
Flexible insulation
Gas seal membrane Duct fully
insulated
Gas seal membrane,
replaceable from
inside the duct
Flexible insulation
Hi-temp composite belt isolated from
flanges using insulation tape
Flow
Hi-temp insulation bag
■ Additional insulation reduces the temperature in the expansion joint
cavity to an acceptable level.
CONSTRUCTION
Outer gas seal
membrane
Insulation
Porous
retainer
layer
Single ply gas seal
membrane
■ Gas seal membrane is exposed to full system temperature.
■ Attachment flanges are insulated and turned-in, preventing adequate
cooling and accelerating deterioration of the gas seal membrane.
■ Exterior insulation prevents the necessary cooling of the gas seal membrane
and attachment flanges, resulting in severe degradation of the
expansion joint.

THORBURN THE FLEXIBLE PIPING SPECIALIST
FLEXI-DUCT DESIGN CONSIDERATIONS
Flexi-Duct Abrasion Resistance Capability
When fly ash and solid particulate matter are present, their
accumulation or abrasiveness must be considered.
Thorburn Flexi-Duct expansion joint has excellent
abrasion resistance when the inner ply is elastomer coated.
When the inner ply is TFE, TFE coated fabric or various
fiberglass and asbestos fabrics, the inside surface of the
expansion joint must be protected from the direct
impingement of particulates. This protection is provided
by internal metal liner either welded, bolted or integral to
the expansion joint or the duct.
Fly Ash Accumulation
Thorburn Flexi-Duct expansion joint typically creates a cavity in the
duct-work where fly ash or dust can accumulate. When this accumulation
becomes severe, it can inhibit movement of the expansion joint. Fly
ash accumulation can be minimized by carefully designing liner
clearances and adding a fly ash barrier.
1) ACCUMULATION BARRIER
Thorburn’s accumulation barrier design, which fills the entire cavity
with a material less dense than fly ash, is commonly used on high
temperature, dry systems or where fly ash accumulation is only a
problem on one side, such as the bottom of a horizontal duct.
2) MEMBRANE BARRIER
Thorburn’s membrane barrier design, consisting of a thin, flexible
material such as fabric, wire mesh or high alloy metal sheet, is
used in a variety of environments where a barrier is required around
the entire perimeter of Thorburn Flexi-Duct expansion joint.
3) INSULATION BARRIER
Thorburn’s insulation barrier design includes placing insulating
materials in the cavity between the expansion joint and the liner.
External Environment Considerations
Correct operation of Thorburn’s high temperature Flexi-Duct expansion joints requires that a portion of the system heat be dissipated
to the external environment. Abnormally hot ambient conditions or an adjacent heat source, reflective surface or duct insulation may
create temperatures which exceed the limits of the gas seal membrane and should be considered when designing the system.
An external cover may be desirable to help protect against falling objects or the accumulation of combustible materials such as coal or
saw dust. Covers should be designed by the expansion joint manufacturer to ensure that proper air circulation requirements are
satisfied.
Page 75

THORBURN THE FLEXIBLE PIPING SPECIALIST
ANGLE FRAME STYLES FOR RECTANGULAR,
SQUARE OR ROUND DUCTS
Best choice when liners (baffles) are required
Landing bar type fit allows for duct misalignment
Accommodates any flat belt selection
Shipped fully assembled for easy installation
“B” BELT ONLY “BB” BELT & BACK-UP BARS
“BF” BOLTED FLANGES “FLW” FLANGE LINER WELDED
SPECIAL ANGLE FRAME STYLES
“EBF”
EXTERNALLY
INSTALLED -
BOLTED IN
FLANGE
Designed for easy, low cost replacement of
flexible element
Designed for operation below the allowable
service temperature of the gas seal membrane
Adaptable to any flat belt frame style
Flexible element can be replaced from inside
the ducting
“EIBF”
EXTERNALLY/
INTERNALLY
INSTALLED -
BOLTED
FLANGE
Gas flow
Gas flow
Back-up
bars
Active length
Typical belt
profile
Angle
frames
Breach opening
Breach opening
Back-up bars
Typical belt
profile
Active length
Angle
frames
“IBF”
INTERNALLY
BOLTED
FLANGE
Gas flow
Page 76
Rectangular joints have full radius corners
Low replacement cost of flexible element
Best choice for attachment of a fly ash barrier
Flanges can act as duct stiffeners
Breach opening
Typical belt
profile
Clamping bars
Angle
frames
“AFW” ANGLE FLANGE WELDED
Thorburn Flexi-Duct expansion joints with flat
expansion belts must always be installed with a radius
corner to assure a leak tight seal. A 3” radius is
satisfactory for most conditions.
Accommodates any flat belt selection
Rectangular joints have full radius corners
Shipped fully assembled for easy installation
Low cost
Includes factory bolt holes
Tack-welded nuts are optional
Also available weld frame design
Accommodates a flanged duct
Bolting accessible from exterior of duct
Designed for operation below the allowable
service temperature of the gas seal membrane
Tack-welded nuts are optional

THORBURN THE FLEXIBLE PIPING SPECIALIST
ANGLE FRAME STYLES FOR RECTANGULAR,
SQUARE OR ROUND DUCTS
“UB” BELT ONLY “UBB” BELT & BACK-UP BARS
A
BREECH
OPENING
Please note that bolts and nuts are available upon request
Installed length / Breach opening 5-1/2” 8-1/2” 11” 15”
Free length / Span 6” 9” 12” 16”
Set-back height flat belt, positive pressure 3” 3” 4” 6”
Set-back height flat belt, negative pressure 4” 6” 6” 7”
Thorburn’s LAM expansion joint has a diaphragm
design for accommodating very large axial
movements. The special belt geometry eliminates
stress and overlap problems.
3
“UBF” BOLTED FLANGES “UFL” FLANGE/LINER
A
A
BREECH
OPENING
BREECH
OPENING
SET BACK
BREECH
OPENING
SET BACK
A
LATERAL MOVEMENT
TYPICAL SET-BACK HEIGHTS (MINIMUM)
Page 77
3
“UAFW” ANGLE FLANGE WELDED
A
BREECH
OPENING
SET BACK
Thorburn Flexi-Duct expansion joints must always be
installed with a radius corner to assure a leak-tight seal.
A 3” radius is satisfactory for most conditions.

THORBURN THE FLEXIBLE PIPING SPECIALIST
FLEXI-DUCT MOULDED CORNER TYPE “MC”
Rectangular or Square Ducting Systems
Thorburn frame Type MC expansion joint features integrally moulded fabric reinforced elastomer belt corners
requiring only one longitudinal splice. Flat mounting-bars connect the fabric to the integrated flanges.
Thorburn frame Type MC has many advantages. Its design allows for maximum movement capabilities. It is
also a low cost joint because it eliminates the need for an additional metal frame (corrosion-affected hardware)
and installation time is minimized. Thorburn Type MC is bolted and self-seals itself to the existing duct flange.
Temperature ranges are from -60º to +500ºF, depending upon the elastomer/fluoroplastic fabric selection. Weldin
or bolt-on flow liners may be added when the medium contains erosive dust or heavy particulate matter.
Higher temperature capabilities are possible utilizing the Thorburn composites build-up.
Accommodates a flanged duct
Bolting accessible from exterior of duct
Replaces existing moulded corner joints
Low initial cost
Designed for operation below the
allowable service temperature of the gas
seal membrane
Thorburn MC moulded corner
Typical moulded corner rectangular expansion joint. This
design is routinely used for scrubber, precepitator, baghouse
and stack hot air or flue gas duct.
Thorburn MCWL moulded corner
with weld-in flow liner
Page 78
Thorburn MCBL moulded
corner with bolt-in flow liner
TYPICAL SETBACK HEIGHTS (MINIMUM*)
Breach opening installed length
Setback height
6” 9” 12” 16”
Moulded corner, positive pressure 3” 4” 4” 5”
Moulded corner, negative pressure 5” 6” 7” 8”
* Manufacturing procedures may require slightly greater standoff;
special clearance restrictions should be specified.

THORBURN THE FLEXIBLE PIPING SPECIALIST
FLEXI-DUCT TYPICAL MATERIALS FOR CONSTRUCTION,
TEMPERATURE LIMITS AND CHEMICAL COMPATIBILITY
Temperature Limits of Flexi-Duct Elastomeric and Composite Materials (ºF)
Elastomer or Thorburn Minimum Typical System Typical Material Intermittent Use**
Polymeric Coating Codes Temperature Temperature Continuous
Gas Seal (Low Temp. Uncoated Materials Temp. Time/Hrs.
Membrane Brittle Point) Temperature*
Neoprene C -40 180-225 180 250 168
Hypalon F -40 225-275 225 250 2600
350 70
EPDM H -60 260-325 260 300 500
350 200
Butyl/Chlorobutyl E -40 260-300 260 350 150
Viton (Dupont)/Flurel (3M) I -40 400-450 400 550 240
600 48
650 1
Teflon J -110 500-625 550 650 100
700 75
* These temperatures represent materials capabilities, in a soaking temperature environment where heating occurs only on one side, not system temperature.
** Excessive intermittent use at high temperatures may have a detrimental effect on useful life at maximum operating temperatures.
Chemical Compatibility of Flexi-Duct Elastomeric and Composite Materials
Neoprene EPDM Hypalon Butyl/ Viton Teflon
(C) (H) (F) Chlorobutyl (E) (I) (J)
Dilute sulfuric acid, R.T.** A A A A A A
Dilute sulfuric acid, Hot* C B A B A A
Conc. sulfuric acid, R.T.**¨ C C A B A A
Conc. sulfuric acid, Hot* C C A C A A
Dilute hydrochloric acid, R.T.** A A A A A A
Dilute hydrochloric acid, Hot* C B A B A A
Conc. hydrochloric acid, R.T.** C B A A A A
Conc. hydrochloric acid, Hot* C C C C B A
Sulfur dioxide, Wet A A A A A A
Sulfur trioxide, Dry C B C B A A
Steam, 212ºF B A B A A A
Rating code: A: Little or no effect; B: Minor to moderate effect; C: Severe effect * Hot temperature: 158ºF ** Room temperature: 70ºF
Temperature Limits & Chemical Compatibility of Various Flexi-Duct Uncoated Fabrics
AAAA
Monel or
Inconel
Reinforced
Chrysotile AAA Alumina-
Nylon Polyester Aramid Asbestos Fiberglass Asbestos Silica Silica
Temperature ºF 230 250 450-700 900 700-1000 1200 1800 2000
Dilute sulfuric acid Good Good Good Fair V. Good Good V. Good V. Good
Conc. sulfuric acid Poor Fair Poor Poor Good Fair V. Good V. Good
SO2, SO3 Good Good Good V. Good V. Good V. Good V. Good V. Good
Page 79

THORBURN THE FLEXIBLE PIPING SPECIALIST
HOW TO ORDER FLEXI-DUCT
Thorburn’s Flexi-Duct round and rectangular fabric expansion joints can be specified or ordered by part number
directly from this catalogue. The following instructions will help determine the correct part number. Completion
of the “Expansion Joint Specification Sheet”, on page 80 of this catalogue, is also helpful and enables Thorburn’s
engineering staff to verify that the correct design has been selected.
How to determine a Flexi-Duct part number
Follow the instructions below to complete Thorburn Flexi-Duct part number. Several examples have been selected
to demonstrate different designs (page 81).
FD
Assembly MCSOT Pressure Style Liner Span Duct Size Materials Additional
Free Inside Instructions
Length Dimension
1 2 3 4 5 6 7 8 X
*For Codes, see page 79
1 ASSEMBLY INSTRUCTIONS
A Assembled - Ready for immediate installation. Includes backup
bars, nuts and bolts.
U Unassembled - Match-marked and packaged to minimize
assembly at the jobsite.
BA Belt, Assembled - Fabric belt elements are provided as a
factory-spliced, endless loop, to fit existing frames.
BU Belt, Unassembled - Fabric elements are prepared for splicing
at the jobsite (see item 7).
Factory holes, back-up bars, nuts and bolts must be specified if
required.
2 MAXIMUM CONTINUOUS SYSTEM
OPERATING TEMPERATURE (ºF)
This is the highest temperature at which the system normally
operates. Excursion (upset) temperatures and durations should be
specified on the “Expansion Joint Specification Sheet”. For
applications exceeding 1200ºF, please consult Thorburn’s
Engineering Department.
3 SYSTEM OPERATING PRESSURE
P Positive pressure only
N Negative pressure only
NP Negative and positive pressure
Maximum rated operating pressure: ±90 in. H 0 (±3 psig)
2
4 FRAME STYLE
Select the appropriate frame style from the standard designs on
the preceeding page. Enter the respective two or three letter code
in the part number. For frame styles, see pages 76 and 77.
Page 80
5 LINER REQUIREMENT
L Integral liner - factory assembled as part of the metal frame.
LP Loose liner by Thorburn - shipped loose, properly sized and
match-marked to minimize field installation.
LO Liner by others.
NL No liner.
When the Frame Style includes an integral liner, such as ULF,
RLFW, MCBL or MCWL designs, enter “L” in the part number.
6 SPAN (Face to Face Dimension)
“Span” (the working face to face dimension) defines the
unrestrained width of the fabric element, and is typically the
distance between the inner edges of the back-up bars. This
dimension determines the amount of movement the expansion joint
is capable of absorbing, and should not be confused with the
installed face to face dimension / breach opening of the entire
assembly.
The graphs on page 81 show maximum concurrent movement
capabilities for four standard spans.
Notes:
Torsion and angular movement capabilities may be obtained
by consulting Thorburn’s Engineering Department.
Larger spans are possible, depending on system pressures and
movements, and require consultation of Thorburn’s
Engineering.
Non-standard face to face dimensions are available.
Movements must be specified in the description accompanying
the part number.

THORBURN THE FLEXIBLE PIPING SPECIALIST
A significant difference exists between the movement capabilities of round expansion joints and large rectangular joints (sides exceeding
3’0” length). This difference is due to the folding characteristics of the fabric element which vary depending on whether it is attached
to straight or curved flanges.
The curves indicate the lateral movement capability corresponding to each increment of axial movement. When little or no axial
movement is specified, lateral capability can be obtained by precompressing the joint (and installing at a shorter face to face dimension)
or increasing flat belt width.
7 DUCT SIZE
■ Assembled and unassembled assemblies
Size is specified as the inside duct measurements, in inches, for
both rectangular and round joints. Standoff height, if non standard,
should be specified under “Additional Instructions”.
■ Belt only designs
If only a fabric element is to be supplied, the size of the belt
attachment flanges should be accurately specified. The diagram
above shows the required dimensions. A dimensional sketch,
including belt width and length, must be supplied when ordering.
Pre-punching bolt holes is not recommended.
How to Order
HOW TO ORDER FLEXI-DUCT
Page 81
X ADDITIONAL INSTRUCTIONS
CAUTION:
INSTALLATION
TEMPERATURE AND
DUCT TOLERANCES
MUST BE CONSIDERED
IN DETERMINING
INSTALLED FACE TO
FACE DIMENSIONS AND
MOVEMENTS.
Adding an “X” to the end of a Flexi-Duct part number enables the
designer to specify additional requirements, using a written
description following the part number. Examples are:
Heat seal iron or vulcanizing equipment
Fly ash barrier (membrane or accumulation)
Dew point composite belt desired
Alternate frame or backing bar material or size
Alternate bolting size, material or pattern
Special liner instructions (such as telescoping liner)
Corner radius
Tack-welded nuts
Frame alignment holes (size and location)
Preset of expansion joint assembly (or special face to face for
shipping)
Drain connection required
Insulation tape or pillow
Special belt materials
Special painting or packaging instructions
8 MATERIALS
Model codes Gas seal membrane material codes Backup bars/flanges material codes
FDR = Elastomeric C = Neoprene H = EPDM F = Hypalon CS = Carbon steel A36/44W S4 = 304SS
FDC = Composite with E = Butyl/Chlorobutyl I = Viton J = Teflon S6 = 316SS XM = Specify material
installation S = Silicon Model FDR = Elastomeric type < 400°F. (204°C.)
Model FDC = Composite type > 400°F. (204°C.)
Model Assembly MCSOT Pressure Frame Liner Span Duct Size/ Material
Deg. F Free Belt Inside Gas Backup Frame
Length Dimension Seal Bars Flange/
(in) Membrane Liner
FDC A 675 N AFW L 16 106 x 140 J CS S4
FDC U 450 P B LO 12 36 x 96 J S6 S6
FDR BU 320 NP UB NL 9 78 I S4 CS

THORBURN THE FLEXIBLE PIPING SPECIALIST
FLEXI-DUCT INSTALLATION INSTRUCTIONS
General Instructions Before Installation
■ CHECK BREACH OPENING for misalignment. Ensure the face to face is to the drawing. All flanges should
be parallel. If misalignment exists or the breach opening exceeds the face to face tolerance by ± 1/4”, consult with
Thorburn technical department.
■ CHECK THE ATTACHMENT FLANGES OR EDGES to be sure they are clean, smooth and free of burrs.
■ CLEAR WORK AREA of all protrusions or sharp objects.
■ PLACE BAFFLES OR LINERS (if part of installation) inside the duct-work before beginning the expansion
joint installation.
■ TRANSPORT THE EXPANSION JOINT to the installation area in its shipping container. If the expansion
joint is to be transported outside of its shipping container, all surfaces contacting with ropes, slings or fork-lifts
should be protected with soft materials.
■ REMOVE THE EXPANSION JOINT from its container, unfold and layout in its approximate installed shape.
Prevent the joint from coming in contact with any sharp objects.
■ INSPECT ALL COMPONENTS for shipping damage.
Flexi-Duct Installation in Vertical Ducting
1. BUILD A PLATFORM of 3/4” plywood or other available material. This platform must be moveable and sufficiently
large to layout the expansion joint in the approximate installed shape. If the joint is factory assembled, the
plywood may not be necessary.
2. COMPRESS THE EXPANSION JOINT by squeezing the
flanges together. Tie down with tape in several places to hold the
joint in compression. The total compressed dimension must be
less than the breach opening to allow for clearance during positioning.
Factory assembled units are pre-compressed and held
with shipping bars which should be left intact.
3. SLIDE PLYWOOD AND JOINT INTO THE BREACH
OPENING. The plywood should rest on the bottom flange. Place
the joint in the approximate position in relation to the flanges.
Cut the tape or remove the shipping bars.
4. POSITION TOP FLANGE AND RETAINING BARS so the
flange holes are aligned. Ensure the joint is properly centered
and install several position bolts.
5. BOLT THE TOP FLANGE AND RETAINING BAR COMPLETELY. All bolts should be installed with the
bolt head against the retaining bar and the nut against the duct flange. Mould the expansion joint from the inside to
remove all wrinkles and to ensure the corner develops the correct configuration.
6. REMOVE THE PLYWOOD CAREFULLY AND REPEAT STEPS 4 AND 5 for the bottom flange.
Page 82

THORBURN THE FLEXIBLE PIPING SPECIALIST
FLEXI-DUCT INSTALLATION INSTRUCTIONS
Flexi-Duct Installation in Horizontal Ducting
1. LASH STIFFENER BARS (wood, steel, etc.) to the
inside of the top of the expansion joint with nylon tape or
rope for use when lifting and positioning.
2. COMPRESS THE EXPANSION JOINT by squeezing
the flanges together. Tie down with tape in several places
to hold joint in compression. The total compressed
dimension must be less than the breach opening to allow
clearance during positioning. Factory assembled units are
pre-compressed and held with shipping bars which should
be left intact. Tie the center bottom of the joint to the top
with tape.
3. PLACE A PLYWOOD SHEET AT BOTTOM OF
DUCT OPENING for support during installation.
4. HOIST THE EXPANSION JOINT INTO BREACH OPENING. Place the joint in the approximate position
in relation to the flanges. Cut the compression tape or remove the shipping bars and cut the tape connecting the
center bottom to the top.
5. POSITION THE JOINT FLANGES AND RETAINING BARS so the flange holes are aligned. Ensure the
joint is properly centered and install several positioning bolts.
6. BOLT THE UPPER FLANGE AREAS COMPLETELY. All bolts should be installed with the bolt head
against the retaining bar and the nut against the duct flange. Mould the expansion joint from the inside to remove
all wrinkles and to ensure the corner develops the correct configuration.
7. REMOVE THE STIFFENER BARS AND THE BOTTOM SUPPORT. Repeat steps 5 and 6 for the balance
of the expansion joint.
1. PLACE THE BAFFLES IN DUCT-WORK prior
to installation of the expansion joint.
2. IF THE BAFFLES ARE TO BE WELDED
INTO PLACE, the welding should be done after
the expansion joint installation.
Installation of Baffles or Liners
a) The expansion joint must be covered with a
welding blanket to protect from weld splatter.
Pre-Installation Storage
If the expansion joints are to be stored for any period of time, they should be kept in their original shipping container.
The storage area should be relatively cool and dry. The area should be removed from any ozone generating equipment
(electrical motors) or heat sources.
Page 83
b) The welding blanket should be removed
before putting the joint in service.
3. IF THE BAFFLES ARE TO BE BOLTED
INTO PLACE, the baffle flange should be
inserted between the duct-work and joint
flanges. A gasket should be installed between
the duct-work and baffle flanges when the joint,
retaining bar, baffle and ductwork flange are
bolted together.

THORBURN THE FLEXIBLE PIPING SPECIALIST
DATA REQUIRED FOR FLEXI-DUCT EXPANSION JOINT DESIGN
Customer’s Name Date Page
Mailing Address Project Name Delivery Req’d.
City, Province (State), Postal Code (Zip Code) Specification No. Inquiry No.
Name of Person Submitting Data Phone No. Item No./Tag No. Item No./Tag No. Item No./Tag No.
QUANTITY PER ITEM
NEW OR REPLACEMENT
SERVICE
SIZE
GAS
PRES.
TEMPERATURE
MOVEMENTS
DUCT
TYPE OF PLANT/SERVICE (PRECIP., SCRUBBER, ETC.)
TYPE OF FUEL AND PERCENT SULFUR (if applicable):
Ph of MEDIA AT THE EXPANSION JOINT ACID _____ CAUSTIC _____ BOTH _____
NUMBER OF STARTUPS AND SHUTDOWNS PER YEAR PEAK LOAD ___ BASE LOAD ___
LOCATION OF E.J. (I.D. FAN OUTLET, STACK, ETC.)
DUCT SIZE (INSIDE DIMS. OR DIA.) Ft In Ft In Ft In
FACE TO FACE DIM. (IF REPLACEMENT OR REQUIRED) Inches Inches Inches
FLOWING MEDIUM (AIR, FLUE GAS, ETC.)
DUST LOAD PSF PSF PSF
FLOW VELOCITY FPS FPS FPS
FLOW DIRECTION (UP, DOWN, HORIZ., ANGULAR UP, ANGULAR DOWN)
DESIGN PRESSURE
GAS TEMPERATURE
AMBIENT
TEMPERATURE
MAXIMUM In H20 In H20 In H20
NORMAL In H20 In H20 In H20
MCSOT ºF ºF ºF
TEMPERATURE ºF ºF ºF
DURATION PER EVENT Hr Hr Hr
CUMULATIVE DURATION Hr Hr Hr
MAXIMUM ºF ºF ºF
MINIMUM ºF ºF ºF
AXIAL COMPRESSION Inches Inches Inches
AXIAL EXTENSION Inches Inches Inches
LATERAL DEFLECTION Inches Inches Inches
ANGULATION / IN PLACE OF LATERAL (YES OR NO) º / Y N º / Y N º / Y N
TORSION º º º
DUCT MATERIAL
DUCT THICKNESS Inches Inches Inches
DUCT CORNER: RADIUS OR SQUARE
INTERNAL LINER
MAXIMUM
EXCURSION
(UPSET)
DUCT OR FLY ASH BARRIER DESIRED (YES OR NO) Y N Y N Y N
OTHER COMMENTS
Page 84

THORBURN THE FLEXIBLE PIPING SPECIALIST
Thermal Expansion of Pipe (in inches/100 feet) Pressure Equivalents
Temp.
deg. F
Temp.
deg. C
Carbon steel
Carbon-Moly
Low-Chrome
(thru 3 Cr Mo)
5 Cr Mo
thru
9 Cr Mo 18
Austenitic
stainless
steels
Cr 8 Ni
12 Cr
17 Cr
27 Cr
-325 -198 -2.37 -2.22 -3.85 -2.04 -3.00 -2.62
-300 -184 -2.24 -2.10 -3.63 -1.92 -2.83 -2.50
-275 -171 -2.11 -1.98 -3.41 -1.80 -2.66 -2.38
-250 -157 -1.98 -1.86 -3.19 -1.68 -2.49 -2.26
-225 -143 -1.85 -1.74 -2.96 -1.57 -2.32 -2.14
-200 -129 -1.71 -1.62 -2.73 -1.46 -2.15 -2.02
-175 -115 -1.58 -1.50 -2.50 -1.35 -1.98 -1.90
-150 -101 -1.45 -1.37 -2.27 -1.24 -1.81 -1.79
-125 -87 -1.30 -1.23 -2.01 -1.11 -1.60 -1.59
-100 -73 -1.15 -1.08 -1.75 -0.98 -1.39 -1.38
-75 -59 -1.00 -0.94 -1.50 -0.85 -1.18 -1.18
-50 -46 -0.84 -0.79 -1.24 -0.72 -0.98 -0.98
-25 -32 -0.68 -0.63 -0.98 -0.57 -0.78 -0.77
0 -18 -0.49 -0.46 -0.72 -0.42 -0.57 -0.57
25 -4 -0.32 -0.30 -0.46 -0.27 -0.37 -0.37
50 10 -0.14 -0.13 -0.21 -0.12 -0.16 -0.20
70 21 0 0 0 0 0 0
100 38 0.23 0.22 0.34 0.20 0.28 0.28
125 52 0.42 0.40 0.62 0.36 0.51 0.52
150 66 0.61 0.58 0.90 0.53 0.74 0.75
175 79 0.80 0.76 1.18 0.69 0.98 0.99
200 93 0.99 0.94 1.46 0.86 1.21 1.22
225 107 1.21 1.13 1.75 1.03 1.45 1.46
250 121 1.40 1.33 2.03 1.21 1.70 1.71
275 135 1.61 1.52 2.32 2.38 1.94 1.96
300 149 1.82 1.71 2.61 1.56 2.18 2.21
325 163 2.04 1.90 2.90 1.74 2.43 2.44
350 177 2.26 2.10 3.20 1.93 2.69 2.68
375 190 2.48 2.30 3.50 2.11 2.94 2.91
400 204 2.70 2.50 3.80 2.30 3.20 3.25
425 218 2.93 2.72 4.10 2.50 3.46 3.52
450 232 3.16 2.93 4.41 2.69 3.72 3.79
475 246 3.39 3.14 4.71 2.89 3.98 4.06
500 260 3.62 3.35 5.01 3.08 4.24 4.33
525 274 3.86 3.58 5.31 3.28 4.51 4.61
550 288 4.11 3.80 5.62 3.49 4.79 4.90
575 302 4.35 4.02 5.93 3.69 5.06 5.18
600 316 4.60 4.24 6.24 3.90 5.33 5.46
625 330 4.86 4.47 6.55 4.10 5.60 5.75
650 343 5.11 4.69 6.87 4.31 5.88 6.05
675 357 5.37 4.92 7.18 4.52 6.16 6.34
700 371 5.63 5.14 7.50 4.73 6.44 6.64
725 385 5.90 5.38 7.82 4.94 6.73 6.94
750 399 6.16 5.62 8.15 5.16 7.02 7.25
775 413 6.43 5.86 8.47 5.38 7.31 7.55
800 427 6.70 6.10 8.80 5.60 7.60 7.85
825 441 6.97 6.34 9.13 5.82 7.89 8.16
850 454 7.25 6.59 9.46 6.05 8.19 8.48
875 469 7.53 6.83 9.79 6.27 8.48 8.80
900 482 7.81 7.07 10.12 6.49 8.78 9.12
925 496 8.08 7.31 10.46 6.71 9.07 9.44
950 510 8.35 7.56 10.80 6.94 9.37 9.77
975 524 8.62 7.81 11.14 7.17 9.66 10.09
1000 538 8.89 8.06 11.48 7.40 9.95 10.42
1025 552 9.17 8.30 11.82 7.62 10.24 10.75
1050 566 9.46 8.55 12.16 7.95 10.54 11.09
1075 580 9.75 8.80 12.50 8.18 10.83 11.43
1100 593 10.04 9.05 12.84 8.31 11.12 11.77
1125 607 10.31 9.28 13.18 8.53 11.41 12.11
1150 621 10.57 9.52 13.52 8.76 11.71 12.47
1175 635 10.83 9.76 13.86 8.98 12.01 12.81
1200 649 11.10 10.00 14.20 9.20 12.31 13.15
1225 663 11.38 10.26 14.54 9.42 12.59 13.50
1250 677 11.66 10.53 14.88 9.65 12.88 13.86
1275 690 11.94 10.79 15.22 9.88 13.17 14.22
1300 704 12.22 11.06 15.56 10.11 13.46 14.58
1325 718 12.50 11.30 15.90 10.33 13.75 14.94
1350 732 12.78 11.55 16.24 10.56 14.05 15.30
1375 746 13.06 11.80 16.58 10.78 14.35 15.66
1400 760 13.34 12.05 16.92 11.01 14.65 16.02
Page 85
25 Cr
20 Ni
Monel
67 Ni
30 Cr
1 lb. per square in. = 27.7 inches w.g.
1 oz per square in. = 1.7 inches w.g.
1 inch mercury = 13.6 inches w.g.
1 inch w.g. = 0.249 kPa

THORBURN THE FLEXIBLE PIPING SPECIALIST
MULTIPLY BY TO OBTAIN
Atmospheres 33.90 Feet of water
Atmospheres 29.92 Inches of mercury
Atmospheres 10330 Kilograms/sq.m.
Atmospheres 14.70 Pounds/sq. in.
Atmospheres 760 M.M. of mercury
Atmospheres 1.058 Tons/sq. ft.
Bars 1.0 x 10 6 Dynes/sq. cm.
Barrels (42 gals.) 0.84 Barrels (50 gals.)
British Thermal Units 777.5 Foot-pounds
British Thermal Units 3.927 x 10 -4 Horse-power hrs.
British Thermal Units 1054.6 Joules
British Thermal Units 0.2520 Kg.-calories
British Thermal Units 2.928 x 10 -4 KW.-hours
Brisith Thermal Units 0.5556 P.C.U. (Pound-Cent. Unit)
B.T.U./cube ft. 8.90 Kg.-cal/cu. meter
B.T.U./Hr. 0.2520 Kg.cal/Hr.
B.T.U./Minute 12.96 Ft.-Lbs./sec.
B.T.U./Minute 0.02356 Horse-power
B.T.U./Minute 0.01757 Kilowatts
B.T.U./Pound 0.556 Gm.cal./gm.
B.T.U./Pound/deg.F. 1.0 Gm.cal./gm./deg.C.
B.T.U./Pound mol 0.556 Gm.cal./gm.mol
B.T.U./Sq.Ft. 0.2712 Gm.cal./sq.cm.
B.T.U./Sq.Ft. 2.712 Kg.cal./sq.m.
B.T.U./Sq.Ft./in. 0.6892 Gm.cal./sq.cm./cm.
B.T.U./Hr. 2.93 x 10 -4 KW/Hours
B.T.U./Sq.Ft./in. 6.892 Kg.cal./sq.m./cm.
Centimeters 0.0328 Feet
Centimeters 0.3937 Inches
Centimeters of mercury 0.01316 Atmospheres
Centimeters of mercury 0.4461 Feet of water
Centimeters of mercury 5.36 Inches of water
Centimeters of mercury 136.0 Kgs./sq. meter
Centimeters of mercury 27.85 Lbs./sq.ft.
Centimeters of mercury 0.1934 Lbs./sq.in.
Centimeters/deg.C. 0.2188 Inches/deg.F.
Centimeters/sec. 1.969 Feet/min.
Centimeters/sec. 0.03281 Feet/sec.
Centimeters/sec. 0.036 Km./Hours
Centimeters/sec. 0.60 Meters/min.
Centimeters/sec. 0.02237 Miles/Hour
Cubic Centimeters 6.29 x 10 -6 Barrels (42’s)
Cubic Centimeters 3.531 x 10 -5 Cubic Feet
Cubic Centimeters 6.102 x 10 -2 Cubic inches
Cubic Centimeters 10 -6 Cubic Meters
Cubic Centimeters 1.308 x 10 -6 Cubic Yards
Cubic Centimeters 2.642 x 10 -4 Gallons
Cubic Centimeters/hr. 0.000151 Barrels (42’s)/Day
Cubic cm./gm. 0.01602 Cu.ft./lb.
Cubic cm./gm.mol 0.01602 Cu.ft./lb.mol
Cubic Feet 0.1781 Barrels (42’s)
Cubic Feet 1728 Cubic inches
Cubic Feet 0.02832 Cubic meters
Cubic Feet 0.03704 Cubic yards
Cubic Feet 7.481 Gallons
Cubic Feet 28.32 Liters
Cubic Feet/min. 472.0 Cu.cm./sec.
Cubic Feet/min. 0.1247 Gallons/sec.
Cubic Feet/min. 62.43 Lbs. of water/minute
Cubic Feet/pound 62.43 Cu.cm./gm.
Cubic Feet/second 60 Cu.ft./min.
Cubic Feet/second 26915 Gallons/hr.
Cubic Feet/second 15380 Barrels (42’s)/Day
Cubic Feet/sec./sq.ft. 0.0305 Liters/sec./sq.cm.
Cubic Inches 16.39 Cubic centimeters
Cubic Inches 5.787 x 10 -4 Cubic feet
Cubic Inches 1.639 x 10 -5 Cubic meters
Cubic Inches 2.143 x 10 -5 Cubic yards
Cubic Inches 4.329 x 10 Gallons
Cubic Meters 6.29 Barrels (42’s)
Cubic Meters 35.31 Cubic feet
Cubic Meters 61023 Cubic inches
Cubic Meters 1.308 Cubic yards
CONVERSION FACTORS
Page 86
MULTIPLY BY TO OBTAIN
Cubic Meters 264.2 Gallons
Ergs 10 -7 Joules
Feet 30.48 Centimeters
Feet 0.3048 Meters
Feet of Water 0.0295 Atmospheres
Feet of Water 2.241 Centimeters of mercury
Feet of Water 0.8826 Inches of mercury
Feet of Water 304.8 Kgs./sq. meter
Feet of Water 62.43 Pounds/sq.ft.
Feet of Water 0.4335 Pounds/sq.in.
Feet/degree F. 54.864 Cm./degree C.
Feet/minute 0.5080 Cm./second
Feet/minute 0.01667 Feet/second
Feet/minute 0.01829 Km./hour
Feet/minute 0.3048 Meters/minute
Feet/minute 0.01136 Miles/hour
Feet/second 30.48 Cm./second
Feet/second 1.097 Km./hour
Feet/second 18.29 Meters/min.
Feet/second 0.6818 Miles/hour
Foot-pounds 1.286 x 10 -3 B.T.U.
Foot-pounds 1.356 x 10 -7 Ergs
Foot-pounds 5.050 x 10 -7 Horse-power hours
Foot-pounds 1.356 Joules
Foot-pounds 3.241 x 10 -4 Kg.-calories
Foot-pounds 0.1383 Kg.-meters
Foot-pounds 3.766 x 10 -7 Kw.-hours
Foot-pounds 7.141 x 10 -4 P.C.U.
Foot-pounds/Min. 3.030 x 10 -5 Horse-power
Foot-pounds/Min. 2.260 x 10 -5 Kilowatts
Foot-pounds/Sec. 7.717 x 10 -2 B.T.U./Min.
Foot-pounds/Sec. 1.818 x 10 -3 Horse-power
Foot-pounds/Sec. 1.945 x 10 -2 Kg.-cal/min.
Foot-pounds/Sec. 1.356 x 10 -3 Kilowatts
Gallon (Imperial) 1.20096 U.S. Gallons
Gallons (U.S.) 0.0238 Barrels (42’s)
Gallons (U.S.) 0.020 Barrels (50’s)
Gallons (U.S.) 3785 Cubic centimeters
Gallons (U.S.) 0.1337 Cubic feet
Gallons (U.S.) 231 Cubic inches
Gallons (U.S.) 3.785 x 10 -3 Cubic meters
Gallons (U.S.) 4.951 x 10 -3 Cubic yards
Gallons (U.S.) 3.785 Liters
Gallons/Hour 0.5715 Barrels (42’s)/day
Gallons/Hour 0.480 Barrels (50’s)/day
Gallons/Hour 3.71 x 10 -5 Cu.ft./sec.
Gallons/Minute 34.3 Barrels (42’s)/day
Gallons/Minute 28.8 Barrels (50’s)/day
Gallons/Minute 2.228 x 10 -3 Cu.ft./sec.
Gallons/Minute 0.227 Cu.meters/hr.
Gallons/Minute 0.06308 Liters/sec.
Gram-centimeters 9.302 x 10 -8 B.T.U.
Gram-centimeters 980.7 Ergs
Gram-centimeters 7.233 x 10 -5 Foot-pounds
Gram-centimeters 2.344 x 10 -8 Kg.-calories
Grams/centimeter 5.60 x 10 -3 Pounds/inch
Grams/millimeter (c.c.) 1 Spec. Grav. at 4 deg.C.
Grams/cubic cm. 62.43 Lbs./cu.ft.
Grams/cubic cm. 0.03613 Lbs./cu.in.
Grams/sq.cm. 9.678 x 10 -4 Atmospheres
Grams/sq.cm. 0.07355 Cms. of mercury
Grams/sq.cm. 3.281 x 10 -2 Feet of water
Grams/sq.cm. 0.394 Inches of water
Grams/sq.cm. 10 Kgs./sq. meter
Grams/sq.cm. 2.048 Lbs./sq.ft.
Grams/sq.cm. 1.422 x 10 -2 Lbs./sq.in.
Inches 2.54 Centimeters
Inches of mercury 0.03342 Atmospheres
Inches of mercury 1.133 Feet of water
Inches of mercury 345.3 Kgs./sq. meter
Inches of mercury 70.73 Lbs./sq.ft.
Inches of mercury 0.4912 Lbs./sq.in.
Inches of water 2.458 x 10 -3 Atmospheres

THORBURN THE FLEXIBLE PIPING SPECIALIST
MULTIPLY BY TO OBTAIN
Inches of water 0.07355 Inches of mercury
Inches of water 0.1869 Cms. of mercury
Inches of water 25.40 Kgs./sq. meter
Inches of water 0.5781 Ounces/sq.in.
Inches of water 5.202 Lbs./sq.ft.
Inches of water 0.03613 Lbs./sq.in.
Inches/degrees F. 4.572 Cms./degree C.
Kilograms 980665 Dynes
Kilograms 70.93 Poundals
Kilograms 2.205 Pounds
Kilograms 1.102 x 10 -3 Tons (short)
Kilogram-calories 3.968 B.T.U.
Kilogram-calories 3086 Foot-pounds
Kilogram-calories 1.558 x 10 -3 H.P.-hours
Kilogram-calories 4186 Joules
Kilogram-calories 426.6 Kg.-meters
Kilogram-calories 1.162 x 10 -3 Kw.-hours
Kilogram-calories 2.205 P.C.U.
Kg.-cal./hour/sq.meter 0.3685 B.T.U./hours/sq.ft.
Kg.-cal/hr./sq.m./deg.C. 0.2048 B.T.U./hr./sq.ft./deg.F.
Kg.-calories/min. 51.43 Foot-pounds/sec.
Kg.-calories/min. 0.09351 Horse-power
Kg.-calories/min. 0.06927 Kilowatts
Kilogram-meters 9.302 x 10 -3 B.T.U.
Kilogram-meters 9.807 x 10 7 Ergs
Kilogram-meters 7.233 Foot-pounds
Kilogram-meters 2.344 x 10 -3 Kg.-calories
Kilogram-meters 2.724 x 10 -6 Kilowatt-hours
Kilogram-meters 0.005165 P.C.U.
Kilograms/cu. meters 10 -3 Gram/cu.cm.
Kilograms/cu. meters 0.06243 Pounds/cu.ft.
Kilograms/cu. meters 3.613 x 10 -5 Pounds/cu.in.
Kilograms/meter 0.6720 Pounds/foot
Kilograms/sq. meter 9.678 x 10 -5 Atmospheres
Kilograms/sq. meter 98.07 Bars
Kilograms/sq. meter 7.355 x 10 -3 Cms. of mercury
Kilograms/sq. meter 3.281 x 10 -3 Feet of water
Kilograms/sq. meter 2.896 x 10 -3 Inches of mercury
Kilograms/sq. meter 0.2048 Pounds/sq.ft.
Kilograms/sq. meter 1.422 x 10 -3 Pounds/sq.in.
Kilometers 3281 Feet
Kilometers 0.6214 Miles
Kilometers 1094 Yards
Kilometers/hour 27.78 Cms./sec.
Kilometers/hour 54.68 Feet/min.
Kilometers/hour 0.9113 Feet/sec.
Kilometers/hour 16.67 Meters/min.
Kilometers/hour .6214 Miles/hr.
Kilowatts 56.92 B.T.U./min.
Liters 6.29 x 10 -3 Barrels (42’s)
Liters 10 3 Cubic centimeters
Liters 0.0351 Cubic feet
Liters 61.02 Cubic inches
Liters 1.308 x 10 -3 Cubic yards
Liters 0.2642 Gallons (U.S.)
Liters 1.057 Quarts (liq.)
Liters/gram mol 16.02 Cu.ft/lb. mol
Liters/kilogram 0.01602 Cu.ft./lb.
Liters/minute 9.06 Barrels (42’s)/Day
Liters/minute 60000 Cu.cm./hour
Liters/minute 5.885 x 10 -4 Cu.ft./sec.
Liters/minute 15.851 Gals./hour
Liters/minute 4.403 x 10 -3 Gals./sec.
Liters/sec./sq.cm. 32.8 Cu.ft./sec./sq.ft.
Mercury at 0 deg. C. 13.595 Grams/cu.cm.
Mercury at 0 deg. C. 849 Pounds/cu.ft.
Meters 3.281 Feet
Meters 39.37 Inches
Meters 1.094 Yards
Meters/degree C. 1.824 Feet/degrees F.
Meters/minute 1.667 Cms./sec.
Meters/minute 0.05468 Feet/sec.
Meters/minute 0.06 Kilometers/hour
CONVERSION FACTORS
Page 87
MULTIPLY BY TO OBTAIN
Meters/minute 0.03728 Miles/hour
Meters/second 196.8 Feet/min.
Meters/second 3.6 Kilometers/hour
Meters/second 2.237 Miles/hour
Miles 5280 Feet
Miles 1.609 Kilometers
Miles 1760 Yards
Miles/hour 44.70 Cms./sec.
Miles/hour 88 Feet/min.
Miles/hour 1.467 Feet/sec.
Miles/hour 1.609 Kilometers/hour
Miles/hour 26.82 Meters/min.
Ounces 28.35 Grams
Ounces 0.0625 Pounds
Ounces (fluid) 1.805 Cubic inches
Ounces (fluid) 0.02957 Liters
Ounces/sq. inch 1.732 Inches of water
Pounds of water 0.01602 Cubic feet
Pounds of water 27.68 Cubic inches
Pounds of water 0.1198 Gallons
Pounds of water/min. 2.669 x 10 -4 Cu.ft./sec.
Pounds of water/hr. 2.669 x 10 -4 Cu.ft./min.
Pounds of water/hr. .1198 Gallons/hour
Pounds/cubic foot 0.01602 Grams/cu.cm.
Pounds/cubic foot 16.02 Kgs./cu. meter
Pounds/cubic foot 5.787 x 10 -4 Pounds/cu.in.
Pounds/cubic inch 27.68 Grams/cu.cm.
Pounds/foot 1.488 Kgs./meter
Pounds/foot/hr. 4.13 x 10 -3 Grams/cm./sec.
Pounds/foot/hr. 0.413 Centipoises
Pounds/gallon 0.1198 Grams/cu.cm.
Pounds/inch 178.6 Grams/cm.
Pounds/square foot 0.01602 Feet of water
Pounds/square foot 4.882 Kgs./sq. meter
Pounds/square foot 6.944 x 10 -3 Pounds/sq.in.
Pounds/square inch 0.06804 Atmospheres
Pounds/square inch 2.307 Feet of water
Pounds/square inch 2.036 Inches of mercury
Pounds/square inch 51.7 Mm. of mercury
Pounds/square inch 703.1 Kgs./sq. meter
Pounds/square inch 144 Pounds/sq.ft.
Square centimeters 1.076 x 10 -3 Square feet
Square centimeters 0.1550 Square inches
Square centimeters 10 -4 Square meters
Square feet 2.296 x 10 -5 Acres
Square feet 929 Square cms.
Square feet 144 Square inches
Square feet 0.0929 Square meters
Square feet 3.587 x 10 -8 Square miles
Square inches 6.452 Square cms.
Square inches 6.944 x 10 -3 Square feet
Square inches 645.2 Square mms.
Square kilometers 247.1 Acres
Square kilometers 10.76 x 10 6 Square feet
Square kilometers 0.3861 Square miles
Square meters 10.76 Square feet
Square meters 1.196 Square yards
Square yards 2.066 x 10 -4 Acres
Square yards 9 Square feet
Square yards 0.8361 Square meters
Square yards 3.228 x 10 -7 Square miles
Steres 1000 Liters

THORBURN THE FLEXIBLE PIPING SPECIALIST
QUALITY, INNOVATION, SERVICE
Thorburn Equipment Inc. is committed to a policy of
continuous development and research to provide flexible
piping products that set the industry standards for quality,
safety, environmental protection, durability and ease of
handling. Therefore, the company reserves the right to
alter and modify designs without notice.
The Heart & Soul of the Company
Our people have turned Thorburn into a lean
manufacturing company. We’re nimble, ready to
respond instantly to your needs with products and
services unique in our industry. Through our
combined efforts, we have designed systems for
administration, engineering and manufacturing,
based on what we know and learn about each
customer and application.
THORBURN'S WARRANTY
Page 88
WARNING
Since performance depends largely upon local conditions
and proper care in use, which are outside of Thorburn
Equipment's control, Thorburn Equipment Inc. can accept
no liability for any defect, damage, injury or loss arising
from the products and information contained in this
catalogue. Readers and customers are encouraged to
conduct their own tests before using any product.
Thorburn warrants its products to be free from any defects of workmanship and material. Thorburn's warranty shall only
cover the components of such assemblies manufactured by Thorburn. Should any such defects be discovered within
three (3) months from the date of purchase by the end user, the questionable part should be returned to Thorburn. If, upon
inspection, the part proves to be defective, Thorburn will furnish a replacement or, at its option, repair the part.
This warranty shall not apply to any part or parts of expansion joints, fittings or connectors products if it has been installed,
altered, repaired or misused, through negligence or otherwise, in a way that in the opinion of Thorburn affects the reliability
of, or detracts from, the performance of the product. Nor does this warranty cover replacements or repairs necessitated
by loss or damage resulting from any cause beyond the control of Thorburn, including but not limited to acts of God, acts
of government, floods and fires.
The obligation of Thorburn under this warranty is limited to making a replacement part available or the repair of the
defective part, and does not include the furnishing of any labour involved or connected therewith, such as that required to
diagnose trouble or to remove or install any such product, nor does it include responsibility for any transportation expenses
or any damages or losses incurred in transportation in connection therewith.
The foregoing is in lieu of any other warranties, expressed, implied or statutory, and Thorburn neither assumes nor
authorizes any person to assume for Thorburn any other obligation or liability in connection with the sale of its products.
Design and preparation: Robert Thorburn
Typesetting and layout: Viviane Katz
ACKNOWLEDGEMENTS
Our company may be known by its products but Thorburn knows
that our products are the result of people who emphasize core
competences, work for excellence and keep the customer satisfied.
Proof reading: Marie Valin
Printing: Québecor
Fluorel is a trademark of 3M companies
Viton, Hypalon, Teflon are trademarks of DuPont Power-Flex is manufactured for Thorburn by Ethelene Corporation

THORBURN THE FLEXIBLE PIPING SPECIALIST
Metallic Bellows Expansion Joint Technology
Thorburn’s metallic expansion joints are
custom designed to accommodate specific
pipe and duct motion problems caused by
thermal growth, pressure contraction, machine
vibration, seismic disturbances and
installation irregularities. Thorburn’s metallic
expansion joints transfer various medias
including steam, emission gases, water, acids,
alkalies, hydrocarbons and molten sodium.
Thorburn’s metallic expansion joints can be
used to relieve stress and absorb movement
in aerospace hot air ducting, hydraulic and fuel
piping systems.
Thorburn in-line universal joint used to absorb
16” of axial movement in a water treatment
plant piping system.
Thorburn’s exclusive 24 hour field
servicing and repairing by skilled
craftsmen, technicians and
engineers at your service.
Thorburn’s Single-Flex high
temperature diesel generating
exhaust expansion joint system.
IN A JAM?
THORBURN’S 48
HOURS EMERGENCY
SHIPMENT POLICY
CAN SOLVE YOUR
PROBLEM!
Quality Assurance
■ Designs as per EJMA and ASME
Section III, VIII, B31.1, B31.3
■ Welders and welding procedures
ASME section IX
■ ASME Section III nuclear service
Class 1, 2, 3
■ Certification ASME Section III
NQA-1 NCA-4000, CSA N285.0
■ Certification ISO 9001/CAN3 Z299.1
Applications which use
Thorburn’s metallic
expansion joint technology
■ Fossil fuel power generating
■ Gas turbines, nuclear reactors
(primary and secondary systems)
■ Petroleum refining and chemical
processing
■ Hot metal industries
■ Ship building ■ Cogeneration
■ District heating and steam
distribution systems
■ HVAC equipment engine exhaust
system
■ Aviation and aerospace duct work
■ Pulp and paper processing
■ Heat exchanges
■ Industrial piping systems
Thorburn’s tied Dual-Flex expansion joint
used to transfer high pressure steam at a
cogeneration facility.

Thorburn Flex Inc
Flexible Piping Specialist
MONTREAL HEAD OFFICE
MARITIMES / WESTERN CANADA
THORBURN FLEX INC.
Manufacturing Division
173 Oneida Drive
Pointe-Claire, Quebec, Canada H9R 1A9
Tel.: (514) 695-8710 Fax: (514) 695-8716
PIPE SIMULATING TECHNOLOGY
UNITED STATES
THORBURN FLEX INC.
151 New Park Avenue
Hartford, Connecticut, USA 06106
Tel.: 1-800-363-6613
Fax: (514) 695-8716
TOLL FREE: 1-800-363-6613 - CALL US NOW AND LET US HELP YOU!
TORONTO / ONTARIO
THORBURN FLEX INC.
49-6A The Donway West, Suite 815
Don Mills, Ontario M3C 2E8
Tel.: (905) 715-7013
Fax: (905) 715-7816