1.8 kilometres DN 600 GRP water main

QUU embraces water pipe relining

System

Rehab

Medium

Water

Application area

Utility

Line type

Water main

Country

Australia

Region

Queensland

Situation

In late 2017, Urban Utilities began investigations to rehabilitate a DN 600 GRP water pipe at Redbank Plains to supply a nearby reservoir. The utility identified a 1.8 km section of pipe to be renewed which had two scour valves, two air valves and two 45-degree bends (DICL) with r = 3 x D.

Urban Utilities opted to use trenchless technology to minimise disruption to the community and the environment, as the pipe ran through a residential area and a park. The utility also identified relining can be faster and more cost-effective than traditional open trench replacement.

Special features

Wide network of drinking water pipelines

UU operates a wide network of drinking water pipelines, amongst them also high-profile pipelines into the CBD of Brisbane.

Project as test run

This smaller project was a sort of “test run” regarding installation, time frame, dimensions of the construction pits and costs compared with dig-and-replace.

Larger rehabilitations in the future

This project was the baptism of fire for Primus Line® and the in-house UU installation team, which was trained in advance, for larger rehabilitations in the future.

Technical details

Material of host pipe

GRP (glass-fibre reinforced plastic)

Diameter of host pipe

DN 600

Transported fluid

Potable water

Operating pressure

9 bar; test pressure: 12 bar

Total length

1,800 m

Number of sections

3 sections

Number of bends

none

Installation time

2 weeks

„„(…) it’s possible to reline up to 650 metres of pipe per day compared with 40 metres using excavation. Plus, we’ve found it has potential savings of up to 40 per cent in capital costs.““

Gavin Flood, former UU Network Program Director

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