It is one of the oldest and simplest trenchless rehabilitation techniques, typically installed from existing manholes without open-cut excavation along the pipe's length. Liners are commonly HDPE, PVC, or fiberglass-reinforced plastic, chosen based on pipe size and the structural and chemical demands of the application.
Sliplining reduces the pipe's internal diameter because the new liner has to be smaller than the host pipe to fit inside it. Hydraulic capacity has to be checked before it is selected as the rehabilitation method, which is why it is more common on pipes with spare capacity than on lines already near their design limit. Installation is governed by ASTM F585 and related standards. Unlike CIPP, service line connections generally cannot be reinstated remotely from inside the pipe. They have to be excavated and reconnected separately, which adds cost and time the bid needs to account for. Whether a spec calls for sliplining, CIPP, or pipe bursting changes a contractor's equipment, crew, and schedule needs. Nonlinear extracts that distinction, along with the pipe diameters and liner material called out in the spec, when it reads a sewer rehabilitation bid package.
