Lining With Cured-in-place Pipes

Published: August 31, 2017 | Last updated: July 5, 2023

What Does Lining With Cured-in-place Pipes Mean?

Lining with cured-in-place-pipes is one of the most favored methods of trenchless rehabilitation. It allows for placing a pipe within a pipe without removing the host pipe. The liner is strong and corrosion resistant and can withstand the same load as the pipe for which it is designed. It has a long service life and can be used for sewage and water pipes. The liner can be inserted from a manhole and thus makes it an excavation free pipe replacement method.


Trenchlesspedia Explains Lining With Cured-in-place Pipes

The liner is made from a variety of strong materials like fiberglass cloth, and non-woven polyester felt, with an external coating of polyurethane. Depending on the size of the pipeline the size of the liner is determined and a calculated quantity of resin is allowed to impregnate the fabric prior to installation. On site the resin soaked liner is positioned within the damaged pipe either by winching or inversion. Once the liner is correctly placed it is allowed to inflate either by compressed air or water to expand it to fit the host pipe. When the correct fit is attained, steam or hot water is circulated within the pipe to activate the thermosetting process. This process hardens and cures the liner after which it is cooled to strengthen and prevent shrinkage.


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