Formed in Place Pipe Lining

Formed in place pipe lining

Formed in place techniques usually have application in man-entry size pipes.
Two main forms of man-entry renovation are available: Ferrocement Lining and Permanent Formwork Systems. Ferrocement lining is not commonly applied in the UK today but when used utilises a mesh framework established at the section of the pipeline requiring renovation. A cement mortar is then usually spray applied over the mesh to create the required thickness of lining. The system can be used for full bore renovation or for part bore renovation such as the invert only.
Permanent Formwork systems are also less used than in previous decades and comprise the construction of a formwork (timber or metal) within the host pipe with an annulus to the required thickness of the lining required. This annulus is then filled with a grout mix and allowed to cure. Once cured the formwork is removed to leave the lining in place inside the host pipe.