CIPP, HDD, Tunnelling, Utility location

CIPP in NZ Capital

To perform the work, Capacity Infrastructure Services has contracted Advanced Pipeline Services.

During the works, normal flow was diverted around the section being worked on, which ranged from 20-150 m long. Once completed, the laterals were re-opened with a remote controlled cutting unit.

Capacity Infrastructure Services Spokesperson Alex van Paassen said the organisation chose this technology because “Cured-in-place-pipe (CIPP) is a fast and efficient means of restoring pipes that have degraded over time.

“A closed, resin-impregnated polyester tube is pushed through the pipe, then forced against the pipe interior and cured in place using heated water. The curing process takes about five hours, after which the closed end is cut off. The resin sets to a hardness that will last another 50 years.”

Mr Paassen said CIPP technology is much quicker, cleaner and cheaper than the alternative of digging up and repairing or replacing pipes. Resins can be adapted for specific needs, and the smooth interior finish improves flow capacity. It is suitable for pipe with diameters ranging from 100 mm to 2.4 m.

The work in Wainuiomata is part of the Hutt City Council’s ongoing program of pipe renewals and rehabilitation aimed at reducing cross-contamination and infiltration between stormwater and wastewater services.

Meanwhile, in Wellington City, Capacity Infrastructure Services has also been utilising horizontal directional drilling (HDD) to renew a sewer in Delhi Crescent.

Currently, crews are underway installing 54 m of 250 mm PE sewer pipe and 21 m of 315 mm PE sewer pipe to reduce the risk of seepage in the area.

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