Inversion lining is a method of installing a CIPP liner in which the resin-impregnated felt or fibre tube is pushed into the host pipe inside out under water or air pressure. As the liner inverts, the resin face is pressed firmly against the host pipe wall, displacing air pockets and ensuring intimate contact. The technique is well suited to pipes from 100mm to 600mm diameter and to runs with bends up to 45 degrees, common in domestic London drainage. Once fully inverted, the liner is cured with ambient resin, hot water or steam in accordance with BS EN ISO 11296-4. Operators must control inversion pressure carefully to avoid stretching or distorting the liner, which can compromise long-term performance.
Inversion lining
Liner installation method using water or air pressure to turn the liner inside out into the pipe.
