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Liner Inverter

Published: December 3, 2021 | Last updated: July 5, 2023

What Does Liner Inverter Mean?

A liner inverter, in the context of cured-in-place pipe (CIPP), can refer to either the device or method used to invert a liner into the host pipe that is being lined. CIPP is a pipeline renewal method that involves the insertion of a flexible liner into the host pipe. The fabric liner is saturated with a thermosetting resin and inserted into the pipeline using a liner inverter. This procedure is typically performed using an existing manhole as the access point.

Trenchlesspedia Explains Liner Inverter

Liner inversion can be done using pressurized air from an air inverter or by using a water column. The process involves turning the liner inside-out during the installation. As the liner is filled with water or pressurized air, the liner unfolds and installs itself through the host pipe. This inversion causes the resin-saturated felt to be pressed against the host pipe wall while the liner coating becomes the new pipe wall. The inverter expands the liner until it presses against the outer walls of the existing pipe. When the resin cures, it hardens to form a new structural pipe within the host pipe.

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