Sliplining is a trenchless drainage renewal technique in which a smaller continuous HDPE pipe is inserted inside an existing damaged drain or sewer to restore structural integrity and hydraulic performance. The annular space between the new liner and the host pipe is then grouted, locking the system in place. The method is widely used for large diameter UK sewer rehabilitation under BS EN 752 and WRc guidance, particularly where conventional CIPP lining is not feasible due to deformation or scale. While slipline reduces the internal diameter, the smoother HDPE surface often compensates for the loss in cross-section through improved flow characteristics. In Greater London the technique has been used on selected Thames Water trunk sewer renewal contracts. For domestic drainage, sliplining is less common than CIPP felt lining but may be considered for severely deformed runs.
Sliplining (HDPE)
Trenchless renewal method inserting a smaller HDPE pipe inside an existing damaged pipe.
