What is Cured-in-Place (CIPP) Lining?

This method restores the structural integrity of the pipe, eliminates infiltration and in many cases, increases the hydraulic capacity of the original pipe. The technology can be used of complete manhole-to-manhole-repairs or located point repairs.

Once steam is applied, a cured-in-place liner forms a thin, high strength, protective wall around the inside of a deteriorating pipe.

Materials and Technology

The composite materials used are comprised of Polyethylene mat and/or fiberglass strand reinforcements impregnated with a thermosetting resin. Installation of the un-cured liner can be by the Pull-in-Place method or by Water Inversion method.

Installation

Pull-in-Place Installation

When using the Pull-in-Place method for installation, the liner is drawn into the existing pipe by means of a winch cable. With the ends of the liner sealed, the liner will be expanded by air and/or steam pressure for curing the composite. Pressure is maintained until the liner cure is complete.

Water Inversion Installation

For installation by Water Inversion, the liner is inserted through an existing manhole by means of an inversion process using water with an application of hydrostatic head sufficient to fully extend it to the next designated manhole or termination point.

The liner is inserted in the vertical inversion standpipe so that a leak proof seal is created. The inversion head is adjusted to a sufficient height to cause the impregnated liner to invert from the point of termination, and hold the liner tight to the existing pipe wall. The water is then heated to a temperature to commence the exothermic reaction of the resin as determined by the catalyst system employed. If there are service connections in the lines, they are reinstated by cutting out the liner material at the point of connection. The connection area is then chemically pressure grouted.

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