Sliplining is a technique involves the pulling in of an HDPE Pipe into the existing pipe to be rehabilitated. Generally the HDPE Pipe is Butt-Welded into long continuous lengths and inserted using a launch pit into sewer, water and gas pipelines.

Short sections of pipe can also be inserted through sewer manholes to limit excavation.

The HDPE Pipe can be grouted in place to improve structural stability and increase the pressure rating of the HDPE Pipe.

 

Butt welding is a type of welding that fuses the head end of one pipe to the tail end of another, using heat, without overlapping the strip.