What is Cured in place pipe

CIPP (cured in place pipe) is one of many trenchless methods utilised in the rehabilitation of an existing pipe. CIPP creates a pipe within a pipe. CIPP is one of the most widely used and known methods and has a vast application range.


Using a liner (felt tube) made of various different materials including felt and fiber glass, is infused with a resin, this is then put in to place within the damages pipe by inversion or being pulled. This is done by using existing upstream or downstream access points. The liner is then inflated using water or air and then left to cure. Cure time varies depending on the type of resin utilised as well as the curing method air, hot water, steam, uv etc. other factors that play in to this time is also the ambient temperature as well as the ground temperature. However cure times can vary from 30 mins up to and over 30 hours.

Once the liner s cured it should have bonded to the host pipe, all other material eg. hoses and bladders (used to blow up the liner) are removed. Once this has occurred a camera is sent in to the pipe to ensure the rehabilitation was successful.  Then the pipeline is put back in to service.

Key Advantages

CIPP does not require excavation to rehabilitate a damaged pipe. CIPP can repare lateral connections as well as cater for bends and traps within a pipe. Some CIPP technologies also have the ability to repair a pipe transition between pipe sizes. With the internal pressure created in the repair process CIPP can effectively reduce infiltration and leaks in pipeline systems without digging.