Terminating A Cured-In-Place Liner

A pressurized sanitary line that was approximately 45″ in diameter had been repaired with CIPP (cured-in-place liner), but water had started to back up behind the liner. Replacement would be time-consuming and expensive, and coating or grouting behind it would not provide a long-term repair.

HydraTite Being Installed Over The End Of A Liner

A cross-section of a pipe that was previously lined and now the liner is being terminated by HydraTite

Engineered Solution

The engineer had reviewed several point repair solutions such as coatings, grouts, and engineered wraps; however, due to the changes in the temperature of the fluid in the pipe and the pressure in the line, the engineer needed a long-term, flexible solution to eliminate backtracking behind the line. After talking with our engineering team, the engineer specified a HydraTite End Seal, a trenchless mechanical solution designed to stop the backtracking water that was jeopardizing the integrity of the liner.

Scope

The liner had some wrinkles that necessitated cutting the liner back 12” to provide a smooth sealing surface. Grout was then applied to make the non-lined pipe’s profile flush with the lined pipe. Once the grout had cured, HydraTech oversaw the installation of the custom 44.15” extra-wide HydraTite seal with 2 of the 2-piece retaining bands over the end of the liner. The seal’s installation took one day.

HydraTite installed over the end of a liner

A field technician positioning the rubber under the steel band

Inspecting the interior surface of a pipe to properly install HydraTite

A close-up of a technician preparing the interior surface of the pipe for proper HydraTite installation

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Solution

HydraTite protected the integrity of the CIPP, which in turn prolonged the life of the pipe. HydraTite prevented the need for replacement, which saved the client time and money.