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

Technology/Method
apply)
CIPP/Inversion with Hot Water Cured
II. Technology Parameters
Service Application Wastewater, Industrial Cooling Water.
Service Connections Liner stops and starts at connections, which must be reinstated via open cut.
Structural Rating Class IV –Structural – handle all external and internal loading. No bonding to
Claimed
Materials of
Composition
the original host pipe wall assumed.
A sewn tube consisting of two or more layers of absorbent non-woven synthetic
fiber combined with glass fiber reinforcement. The outside layer of the tube is
plastic coated with a translucent flexible material for visual inspection during
resin impregnation. A vinyl ester resin, compatible with the inversion and curing
process, is used.
Minimum Physical Properties (25 o C)
Property ASTM Method Value
Initial Flexural Modulus of Elasticity D790 250,000 psi
Initial Flexural Strength D790 7,000 psi
Initial Tensile Strength D638 6,000 psi
For internal pressure design, a long-term tensile strength equal to 1/3 rd Diameter Range,
inches
of the
initial design value is used. In addition, a factor of safety of 2 is utilized.
8-72 inches
Thickness Range,
inches
5–26 mm
Pressure Capacity, psi Up to 80 psi, diameter dependent.
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
Not suitable for potable water.
Design Standards ASTM F1216, Appendix X1.3.2 for the Fully Deteriorated Pressure Pipe
condition.
Design Life Range 50 years
Installation Standards ASTM F1216
Installation
Pipeline is to be cleaned and all debris removed from the interior. The line is to
Methodology be CCTV inspected 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
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