State of Technology Report for Force Main Rehabilitation, Final ...

Technology/Method CIPP/Inversion with Hot Water Cured
II. Technology Parameters
Service Application Water (potable), Gravity and Low Pressure Wastewater, Industrial - cooling
water, fire water, and process lines
Service Connections Liner stops and starts at connections, which must be reinstated via open cut.
Structural Rating Class III – Semi-Structural, capable of bridging holes, gaps and joints while the
Claimed
Materials of
Composition
host pipe carries the full internal pressure
Vinyl ester or epoxy resins (special epoxy for potable water), standard Insituform
CIPP non-woven felt tube but with special glass reinforcement included.
Minimum Physical Properties (25 o C)
Property ASTM Method Value
Initial Flexural Modulus of Elasticity D790 250,000 psi
Initial Flexural Strength D790 6,500 psi
Initial Tensile Strength D638 5,000 psi
Initial Tensile Modulus D638 300,000 psi
For design of spanning over small holes, the flexural strength is reduced to 1/3 rd
Diameter Range,
inches
of the initial value for long-term performance. In addition, a factor of safety of 2
is utilized.
8-60 inches
Thickness Range,
inches
0.3-0.7 inches (8–18 mm)
Pressure Capacity, psi Up to 200 psi
Temperature Range,
o
F
120 o F
Renewal Length, feet 200 to 1,000 feet
Other Notes All terminations must be fitted with mechanical end seals.
Product Standards
III. Technology Design, Installation, and QA/QC Information
Special epoxy used for potable water applications – NSF 61 listed
Design Standards ASTM F1216, Appendix X1.3.1
Design Life Range 50 years
Installation Standards F 1216
Installation
Pipeline is to be cleaned and all debris removed from the interior. CCTV should
Methodology be performed before lining. All obstructions, including reducers, line valves and
protruding connections to be removed. The reinforced Insituform felt tube is
resin saturated either in the factory or on site and prepared for installation. On
site, the tube is positioned in the pipeline using water pressure to turn the tube
inside out (inversion). The water pressure forces the tube to a close fit with the
host pipe. After positioned, the resin is cured by circulating hot water through
the tube. Once cured, the pipe is cooled to a maximum of 90 o F. The ends are cut
and sealed. Expansion type end seals with expandable stainless steel bands and
elastomeric seals are used for this purpose. The pipe may be returned to service
after CCTV inspection and pressure testing.
QA/QC • Prior to insertion of tube, CCTV inspection of main needed to locate any
obstructions, protrusion, changes in diameter or in-line valves that could
affect liner.
• After insertion and cure, liner inspected again visually with CCTV, and any
abnormalities are noted.
• For each inversion length, one liner sample, suitable in size to yield 5
specimens, is collected either from a section of the cured pipe lining
(usually at termination point) or a flat plate sample and subjected to flexural
and tensile testing. Average values should exceed minimums used for
design.
• Pressure testing to be carried out after liner has reached original ambient
ground temperature. The liner and host pipe subjected to a hydrostatic
internal pressure equal to twice the known operating pressure, or operating
pressure plus 50 psi, whichever is less. After stabilization period of 2-3
hours, test period is one hour. Limit on make-up water to maintain pressure
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