Cured-in-Place-Pipe (CIPP) Watermain Lining is a method of watermain renewal achieved through the installation of a lining on the interior of existing aging watermains. First, the interior of the watermain is cleaned using any number of tools, including high-pressure washing and scrapers to remove any existing linings, tuberculation, and buildup to create a smooth surface. The liner, composed of either an unreinforced or glass reinforced felt tube, is impregnated with a thermos-setting resin and inserted into the existing watermain. Following installation, the liner is cured using hot air or hot water until hardened.
Water service connections are robotically re-instated from the interior of the pipe, or by tapping a new service from the exterior. In addition to laboratory testing of liner samples, the liner quality is inspected using CCTV camera and any deficiencies are removed and replaced. All valves, hydrants, and sub-standard water services are replaced as part of the work, resulting in a renovated water system.
The rehabilitated watermain is designed to last 50 years.