CURED-IN-PLACE (CIPP) LINING

CIPP Linings

CIPP Linings are preferred when a pipeline is still in reasonable structural condition and capacity is not critical, but where a problem with leakage still occurs. The felt lining is impregnated with resin that incorporates a chemical catalyst or hardener to facilitate curing.  The lining can be tailor made to provide the chemical resistance and strength required to resist a high water table or traffic loading.

Insitu Pipelines can apply CIPP lining on pipe diameters from 75mm to 1200. Lengths of up to 300m can be inverted in a single operation. We pride ourselves on effective project management that, together with our experience and skills in trenchless solutions, ensures construction projects are completed on time, within budget and to the most exacting quality standards.

HOW DOES IT WORK?

Step 1

A resin-impregnated, flexible “sock” is turned inside-out, and inserted into the pipeline. Lengths installed may vary from short sections over a joint or defect, to full length linings of up to 300mm continuously, diameter dependent.

Step 2

A scaffold tower or pressure vessel is used to apply a head of water or air pressure, forcing the “sock” against the inner diameter of the pipeline.  This turns the liner inside-out and pushes it along the host pipe. The sock expands to conform to the shape of the original conduit, smoothing out irregularity such as slightly displaced joints or localised deformation.

Step 3

The resin is then cured using heated water, creating a close fitting “pipe within a pipe”. This is usually cured within a day. After the pipe has been cured, the liner is cooled and the ends removed flush with the pipe ends, and sealed where necessary.

Step 4

After lining, service connections or laterals are reinstated, often using remote control robotic cutter.

WHEN TO USE IT

This technique is well suited to industrial applications where polluted ground water is infiltrating the storm water system, and this water is then discharged into rivers and dams. It is also used where pollutants from industrial waste water systems are contaminating the soil due to pipe leakage. Cured in place pipe (CIPP) can be used to rehabilitate sanitary sewers, storm drains and process effluents.

Refurbishing is not limited to circular pipe – overall, square box culverts can be lined. It is possible to invert through multiple vertical and horizontal bends and both horizontal and vertical pipelines can be relined.

The resin and geotextile fabric can be tailor-made to provide appropriate chemical resistance and strength to deal with high water tables, internal and external pressure and traffic load.

Disruption to Service

No excavation. Lining with CIPP removes the pipe from service only for the duration of the preparation, installation and reinstatement process.  After inverting the sock, the pipe is returned to service, usually within the same day. Lined water mains must be disinfected before returning to service.

OTHER TRENCHLESS TECHNOLOGIES

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