in2 pitch fibre pipe replacement capability

in2 demonstrates pitch fibre pipe replacement capability for Yorkshire Water

When Yorkshire Water needed to replace a 40 metre section of 6" pitch fibre pipe sewer with deformities of up to 60%, at a housing estate in Colburn, Dyno-Rod's in2 system was selected as the best solution.

The sewer with the damaged pipe ran from the front garden of one property, under pavements, the public highway, a grass bank and into the rear garden of a house on the opposite side of the road.

Yorkshire Water chose the in2 system as a more suitable solution than a Cured In Place (CIPP) lining which was not suitable since the pipe deformity exceeded 20%.

Furthermore, pipe bursting as an alternative approach could also not be used on the section of sewer running under the road because of the concrete surround.

Excavation was not a feasible option either due to the disruption that would have been caused by a road closure.

The damaged sewer also had the potential to cause a flood due to the extent of the pipe deformities and the high volume of sewage running through the system.

In order to re-round the 40 metres of 6" diameter pitch fibre pipe and then install new 150mm diameter in2 pipe, the plan was to work from manhole to manhole.

However, following a site visit, it was realised that due to the configuration, position and garden layout, it would be impossible to use one of the manholes.

A small excavation on the down stream side of the road, in the grass verge, between the road and the garden had to be made.

This would then be used to locate the in2 pulling equipment, with the pipes being installed from the up stream manhole and then being turned around to pull pipes from the down stream manhole.

As the pipe had to be installed under the road, at a depth on 1m it was decided to use a 160mm diameter specially developed towing- in head connected to a PB30 hydraulic pulling machine.

It was planned to complete the work over a four day period.

This included one day for preparing the manholes and excavation, two days for re-rounding the pitch fibre pipe and installing the in2 pipe and a final day for re-instating the excavation and manholes together with a CCTV survey.

The Dyno-Rod installation team carried out a full survey of the area around where the small excavation was going to be made in order to confirm that there were no other utility services.

Following the excavation to uncover the damaged pitch fibre pipe, the engineers cut out the section of deformed pipe before undertaking the in2 installation process.

The job was successfully completed within the allocated time without any disturbance to the local residents or disruption to the local traffic.

The client was satisfied as the job was completed within budget and without complaints from the local residents.

Yorkshire Water continued to monitor the run as a flood risk but there has been no instance of flooding.

The technical advantages of the in2 system over excavation, CIPP, pipe bursting and sliplining were again demonstrated as the ideal solution to pitch fibre pipe replacement.

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