What Does Pipe in Pipe System Mean?
A pipe in pipe system, in the context of trenchless rehabilitation, refers to the method of replacing old, worn out or damaged pipes with new pipes or liners. This trenchless solution to rehabilitate sewer and water pipelines requires little to no excavation and can be usually carried out from the nearest manholes. There are many different methods of rehabilitating with the pipe in pipe system, depending on the need and ease of access. CIPP (cured-in-place-pipe) is generally the preferred method because of its long life and anti-corrosive properties.
Trenchlesspedia Explains Pipe in Pipe System
CIPP can be used to rehabilitate entire lengths of pipe, manhole to manhole, providing a seamless, joint-less pipe within the original pipe. This method can be used to rehabilitate pipes of a diameter ranging from 2 inches to 150 feet. The convenience of this type of rehabilitation lies in the fact that it can be performed from manholes, and does not require any kind of excavation. Before the process is started, the target pipe is cleaned and isolated. Once the resin saturated liner is inserted, it is expanded until it fills the pipe. Once completely expanded, the liner is allowed to cure by applying heat. On completion, the liner is checked for damage by inspecting with a CCTV camera. The excess liner at the ends are cut off and sealed before flow is restored.