Pipe relining is a process that can be used where the existing line is properly sloped and also there is no collapsing or damaged sections of pipe.
Pipe relining is a process of first using a hydro jetting machine to clean the inside of the pipe of all tree roots and debris. A liner is installed into the pipe and then inflated.
At that point a ultraviolet light is used to cure the liner until it is hardened. Liners can be installed only where there are minimal turns in the pipe and generally the line needs to be larger than 4" in diameter.
Pipe bursting is the preferred trenchless method over a liner system, however in situations where piping is poured inside a concrete sleeve or the piping is indoors. Liners can be a cost effective method of rehabilitation.