Over the past few decades, the average drinking water consumption per person has consistently fallen, resulting in reduced volumes of waste water. In the context of this trend, pipe relining has grown in importance; the lower volumes of water now flowing to and from properties at lower flow speeds mean that pipe diameters can be reduced.
This is where pipe relining comes in. In pipe relining, new ductile cast-iron pipes are pulled into and along existing pipes that are no longer suitable for transporting water. Cast-iron pipes can be pulled in protected by a conical steel head attached to the pipe socket, or pulled or slid into the pipe on a transport bracket. The BLS® joint is used to pull in the pipe. Other supply lines, such as collector pipes, can also be attached to the transport bracket. The engineers only need to dig at the start and end of the new pipeline. The work has little impact on the road or road surface and does not significantly affect traffic or surrounding properties. The hollow gap between the old and the new pipe can be filled once the new pipe has been successfully installed.
If the gap is not filled, the pipes used should have a cement-mortar coating (CMC).