Pipe lining, is the rehabilitation or reinforcement of pipes without excavation. It has become the method of choice for rehabilitation of deteriorated underground sewers and pipes due to its low installation cost, ease and speed of installation and minimisation of ancillary requirements such as traffic re-routing and security. Cured in Place Pipe (CIPP) Lining is a method of repairing a pipe using a flexible tube impregnated with a resin, which forms a new pipe within the original host pipe once the resin cures.
At the heart of the CIPP system is the resin matrix. Until curing, in this case either by heat (hot water or steam) or by a time delay mixing catalyst, it remains in a liquid state within the host material – a needled felt tube. Heat and ambient cured CIPP liners can be manufactured or impregnated with resin on site and have a short shelflife.