pdf/L500-liquid ring vacuum pumps and compressors.pdf

L_Series
L_500
Liquid Ring Compressors

L_500 Compression of process gases
In 2002 The Nash Engineering Company in the USA and elmo
vacuum technology GmbH, a Siemens subsidiary in Germany,
united to form nash_elmo Industries.
The L_500 liquid ring compressors were created specifically for the
chemical and petrochemical processing industries. They combine
the highest standard of reliability with a new level of ingenuity.
nash_elmo utilizes advanced design technologies to achieve
optimum capability.
The multidisciplinary design process relied on input from R&D,
manufacturing, marketing and most importantly our customers –
the chemical process engineers. The result: a revolutionary line
of compressors tough enough to be branded nash_elmo.
L_500 compressors at final inspection
Advantages at a glance:
■ Wide range of gases handled
■ One-stage or two-stage compression
up to 2,600 scfm (4,400 m 3 /h)
■ Pressure capability up to 175 psig (12 bar g)
■ Low temperature compression
■ High reliability
■ Long life cycle
■ High operational safety
■ Robust, low maintenance
Main applications:
■ Chlorine compression
■ Hydrogen compression
■ Vinyl chloride
■ Pulp and paper bleaching
process with ozone
■ Recovery of hydrocarbons
e.g. flaregas or gasoline vapors
■ Acetylene compression
… and many others
2 nash_elmo Industries L_500

nash_elmo compressor capability chart
Discharge pressure psig
atm 40 80 120 160 175
100,000
m 3 /h
scfm
Suction capacity
28,800
additional models
17,000
9,000
10,000
2,600
2,000
1,500
L_500 models
1,000
1,000
500
160
atm 2 4 6 8 10 12 14
Discharge pressure
bar g
The right design
nash_elmo designs and manufactures liquid ring compressors covering a
wide range of capacities up to 17,000 scfm (28,800 m 3 /h) and pressures
up to 175 psig (12 bar g). Our liquid ring design enables low temperature
gas compression, ideal for handling many process gases, including
explosive mixtures.
The right materials
Material choices include cast iron, ductile iron, steel and stainless steel,
with other materials available on special request, ensuring the right
metallurgy to handle most highly aggressive and corrosive vapors, as well.
Single, double, and gas lubricated shaft seals are also available.
The right protection
nash_elmo L_500 compressors are built to ISO 9001:2000 standards. Most
are also ATEX certified in accordance with guideline 94/9/EG, category 1 and 2.
nash_elmo Industries L_500 3

L_500 Performance at a glance
Features
Benefits
Rugged design
High reliability
Low temperature compression Ability to handle explosive and
flammable gases
Liquid ring
Low maintenance/vibration
Many material options Ability to handle corrosive gases
Wide variety of seal options Meets process and safety needs
ATEX certified
High safety standards
100% performance tested Troublefree startup and operation
Backed by 2 year warranty Peace of mind
and over 100 years of vacuum
and compressed gas experience
We design and develop solutions engineered
to your individual needs. Contact us for further details.
4 nash_elmo Industries L_500

Technical specifications: L_500 (models 2BK)
D
C
A
B
Model A B C D Suction and
discharge flange
connections
2BK1 162 1270 380 510 250 DN80 mm
50 15 20 10 3-IN. FLG inches
2BK1 222 1520 510 760 380 DN100 mm
60 20 30 15 4-IN. FLG. inches
2BK1 282 1650 640 890 380 DN125 mm
65 25 35 15 5-IN. FLG. inches
2BK1 332 2160 760 1020 510 DN150 mm
85 30 40 20 6-IN. FLG. inches
■
■
■
Inlet gas path
Discharge gas path
Operating liquid
Model Suction capacity V Discharge pressure Power P
m 3 /h scfm bar g psig kW hp
2BK1 162 300 – 900 175 – 530 4 60 50 – 100 65 – 135
2BK1 222 800 – 1600 470 – 940 5 75 50 – 200 65 – 270
2BK1 282 1250 – 2700 735 – 1590 4 60 80 – 250 105 – 335
2BK1 332 2500 – 4000 1470 – 2355 4 60 120 – 350 160 – 470
nash_elmo Industries L_500 6

Technical specifications: L_500 (models 2BG)
C
D
A
B
Model A B C D Suction and
discharge flange
connections
2BG1 150 1265 380 635 250 DN80 mm
50 15 25 10 3-IN. FLG. inches
2BG1 151 1400 380 635 250 DN80 mm
55 15 25 10 3-IN. FLG inches
2BG1 231 1900 760 890 380 DN125 mm
75 30 35 15 5-IN. FLG. inches
2BG3 189 1270 760 635 250 DN80 mm
50 30 25 10 3-IN. FLG. inches
■
■
■
■
Inlet gas path
Inter stage path
Discharge gas path
Operating liquid
Model Suction capacity V Discharge pressure Power P
m 3 /h scfm bar g psig kW hp
2BG1 150 200 – 400 120 – 235 10 145 50 – 150 65 – 200
2BG1 151 400 – 800 235 – 470 12 175 75 – 250 100 – 335
2BG1 231 900 – 1800 530 – 1060 9 130 300 – 500 400 – 670
2BG3 189 450 – 750 265 – 440 15 220 50 – 250 65 – 335
nash_elmo Industries L_500 7

Technical specifications:
L_500 (models HP)
Models HP4 thru HP8
C
D
Model HP9
A
A
B
B
C
D
Model A B C D Suction and
discharge flange
connections
HP4 685 340 250 150 DN50 mm
27 13 10 6 2-IN. FLG. inches
HP6 1090 635 510 280 DN100 mm
43 25 20 11 4-IN. FLG. inches
HP7 1270 760 640 355 DN150 mm
50 30 25 14 6-IN. FLG. inches
HP8 1520 940 890 430 DN200 mm
60 37 35 17 8-IN. FLG. inches
HP9 1520 1400 1015 510 DN250 mm
60 55 40 20 10-IN. FLG. inches
Model Suction capacity V Discharge pressure Power P
m 3 /h scfm bar g psig kW hp
HP4 255 – 350 150 – 205 5.5 80 40 – 75 55 – 100
HP6 750 – 900 440 – 530 5.5 80 90 – 160 120 – 215
HP7 950 – 1700 560 – 1000 5.5 80 180 – 300 240 – 400
HP8 1850 – 2900 1090 – 1705 5.5 80 225 – 450 300 – 605
HP9 2800 – 4250 1650 – 2500 7.6 110 600 – 1000 805 – 1340
nash_elmo Industries L_500 5

Functional principle of an L_500 compressor
Single-stage
The rotor 1 is positioned in the center of the elliptical casing 2. Centrifugal force causes
the seal liquid to form a ring against the inner surface of the casing 3. The liquid is
moving away from the center of the rotor in the inlet area, drawing the gas into the
rotor chambers 4. As these chambers rotate, the liquid is pushed back into the chambers,
compressing the gas before exiting at the discharge port 5. The internal forces are
balanced due to the double-acting design, thereby reducing stress on the shaft, bearings
and mechanical seals for longer pump life.
Discharge
2BK models
Inlet
HP models
1 Rotor
2 Casing
3 Liquid ring
4 Intake port
Inlet
Discharge
5 Discharge port
The brown arrows show the balanced
forces in the compressor.
Two-stage
The rotors 1 are positioned eccentrically in two cylindrical casings 2. Centrifugal force
causes the seal liquid to form a ring 4 against the inner surface of the casing. The liquid
is moving away from the center of the rotor in the inlet area, drawing the gas into the
rotor chambers 3. As these chambers rotate, the liquid is pushed back into the chambers,
compressing the gas before exiting the first stage 5. The second stage functions in the
same manner, but is rotated 180°, thereby balancing the internal forces. This reduces
stress on the shaft, mechanical seals and bearings, thus extending pump life.
2nd stage 2BG models 1st stage
1 Rotor
2 Casing
3 Intake port
4 Liquid ring
5 Discharge port
8 nash_elmo Industries L_500

Commitment, reliability and worldwide support
For 100 years, we have been assisting our customers in making the right vacuum
pump or compressor choice. As your engineering partners, we will provide you with
a nash_elmo performance analysis which includes a review of your particular process
requirements, and provides you with alternative means for meeting your process
needs. We will supply engineering data and application information, along with
short- and long-term cost comparisons.
Beginning today and throughout the life of every nash_elmo system, our engineers
are ready to support you to meet your vacuum and compressor process tasks.
Factory tested
Before any nash_elmo compressor is shipped out of our factory, it is performance tested
to meet the highest standards. We stand behind our products: every nash_elmo L_500
pump comes with a TWO-YEAR WARRANTY. Our new test bay gives us the capability to
simulate nearly all real operating conditions for liquid ring compressors.
A global service network with local support
nash_elmo maintains service centers strategically located throughout the United States,
Europe and Asia. Each center is staffed by specialists with considerable application
know-how. They have original factory replacement parts in stock and are equipped
with the tools, fixtures and special machinery necessary for pump and compressor
repair. The nash_elmo commitment to service extends to its regional distribution centers
and retailers. Stocked with inventories of factory parts and purchased components,
our distribution centers can deliver pumps and parts anywhere, any time. We are also
able to service vacuum pumps and compressors of other makes and models.
A new company, a unified vision
nash_elmo is more than a new company. It is the fusion of global leaders in the
development, design and application of vacuum and compressor system technology.
Our combined resources give us the ability to provide the best solution to any industrial
need virtually anywhere in the world. We are a company with an extensive range of
products and services and an unmatched reputation for reliability. Because nash_elmo
is a company with the resources to turn the most ambitious vision into reality and to
put that vision to work for you.
nash_elmo Industries L_500 9

Other nash_elmo product lines
L_Series:
Liquid Ring Pumps
Robust technology for the highest demands and varied applications
Machines in the L_Series distinguish themselves through low operating
temperatures and are suitable for handling splash water, steam
and condensates. They were developed for the toughest applications
and can safely and reliably extract or compress even explosive gas/
steam mixtures (ATEX-certified). Selection of a suitable operating
liquid enables the L_Series vacuum pumps and compressors to be
optimally integrated into processes. Thanks to their low operating
costs and extensive performance range up to 37,000 m 3 /h
(22,000 cfm), they excel in any application.
G_Series:
V_Series:
D_Series:
Gas Ring Blowers
Vane Pumps
Dry Pumps
nash_elmo Industries
www.nash-elmo.com
info@nash-elmo.com
Corporate Headquarters
Trumbull, CT USA
9 Trefoil Drive
Trumbull, CT 06611-1330
Tel.: +1 800 553 6274
Proven, reliable and extremely quiet
Whether vacuum pumps, compressors or systems for conveying air,
gases or air/gas mixtures, the extensive range of products in the
G_Series meets the widest range of requirements. Thanks to their
variable voltage motors, many are usable anywhere in the world
without the need for conversion. In addition to their compact construction,
full UL/CSA certification and innovative design, G_Series
pumps and compressors offer a comprehensive power range up to
2,500 m 3 /h (1,470 cfm), maximum power density and a wide selection
of accessories, including frequency converters.
Simple design for varied applications
The vane pumps in our V_Series are known for their robust design,
easy handling and long service life. Furnished with an extremely
sturdy metal coating as well as installation- and service-friendly
plug & play functionality, these high performance machines are
extremely quiet in operation, and can meet even the most challenging
industrial demands while covering an impressive performance
range up to 4,000m 3 /h (2,350 cfm) and 10 bar g (145 psig).
High reliability with low operating costs
The dry-running vacuum pumps in our D_Series are explosion-proof
and were specially developed for production processes involving
sensitive materials. Throughout the entire process, they operate
condensation-free – and therefore corrosion-free – because there
are no operating fluids to mix with the process gases. As a result,
discharge gases can simply be collected and/or returned to the process.
There are no waste products. In addition, all pumps in the D_Series
are highly efficient and provide a constant suction capacity over an
extremely wide range of pressures with a performance range up to
to 2,200 m 3 /h (1,300 cfm).
European Headquarters
Nuremberg, Germany
Katzwanger Straße 150
D-90461 Nürnberg
Tel.: +49 911 1454 0
Order-No: VNE:B-PB013-A2-AM
Printed in Germany
Dispo 27801
2238/021 16.0 / 04-2004
© 2004 All rights reserved
HENNIG · Nbg All illustrations are non-binding · All dimensions are approximate. Subject to technical modifications