Advanced PVC-A Lining for Irregular and Large Pipes
Thermoform PVC-A lining represents the next generation of trenchless pipe rehabilitation. This factory-manufactured, fold-and-form solution is ideal for pipes up to 48 inches in diameter, including those with irregular shapes, ovality, or deformation that would challenge traditional CIPP methods.
A folded PVC-A liner is pulled into the host pipe, then heated with steam or hot water. As the liner heats, it unfolds and expands to fit tightly against the pipe wall, conforming to irregularities and deformations. Once cooled, the liner forms a continuous, structural PVC pipe with a smooth interior surface.
Storm drain lining with PVC fold-and-form technology begins with video camera inspection of the host pipe to identify obstructions. Then the storm drain is cleaned. A winch cable pulls the folded liner through the pipe from the downstream manhole.
After stress relief, steam from heat source equipment uniformly raises the liner temperature until it forms to the pipe walls. The liner is then cooled using compressed air or a water-air mixture until exhaust temperatures reach a constant 110°F for at least 20 minutes. This completes the curing process.
Finally, robotic cutting machines with CCTV cameras trim the ends and reopen laterals and service connections.
Key Advantages
Comprehensive assessment solutions tailored to your infrastructure needs
Meets recognized industry standards for thermoplastic pipe liners
Conforms to egg-shaped, deformed, or non-circular cross-sections
No styrene emissions, no ambient cure concerns, no resin shelf-life issues
Can be cut, tapped, or modified for future lateral connections or changes
PVC-A offers excellent chemical resistance and structural durability
Consistent quality control with no field mixing or preparation required
TrenchFree installs Thermoform PVC-A liners in pipes from 8 inches to 48 inches in diameter, in the South Bay and around the San Francisco Bay Area.
Contact us today to schedule your pipeline inspection and receive a detailed assessment of your infrastructure needs.
