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

Technology/Method Glass Reinforced Thermoplastic Liner/Thermoformed
inserted into the thermoplastic composite sock. The pig heats the polypropylene
until it melts. An inversion drum deploys a silicone rubber inflation tube which
pushes the pig through the pipe. Application rate is 0.5 m/min. The inversion bag
also presses the molten thermoplastic composite sock against the pipe wall where
it cools to form a solid homogeneous thermoplastic composite liner. Pressure in
the inversion bag is kept at 45 psi (3 bar). The inversion bag is deflated and
removed after the liner cools.
QA/QC After installation, CCTV inspection should be performed on the liner. The
internal surface is to be smooth, clean and free from scoring, cavities, wrinkling,
and other surface defects. Samples of the formed liner should be checked for
thickness, short-term flexural modulus and tensile strength, but as yet no design
values have been provided.
IV. Operation and Maintenance Requirements
O&M Needs None identified yet.
Repair Requirements
for Rehabilitated
Sections
Remove host pipe and Aqualiner. Replace with new pipe section and tie back to
existing host pipe with repair clamps.
V. Costs
Key Cost Factors • Mobilization – one fully equipped installation truck, compressor and
generator.
• Pipe cleaning as for close fit lining.
• Principal costs include liner tube, installation labor, crew size (3-4), and
power usage.
• Service lateral reinstatement by open cut or remote robotics as per close fit
lining.
Case Study Costs Estimated Cost ~ $35-$40/feet
VI. Data Sources
References Aqualiner Product Specification Issue 3 (Aug. 12, 2007)
A-67