Distribution, Gas, Markets, Technology

Every pipe has a goldlining

Rehabilitating in New South Wales

Jemena has been using “˜goldlining’ to rehabilitate its gas distribution network in New South Wales.

Goldlining refers to the process of inserting nylon piping into the existing gas distribution mains, reducing the need to dig trenches in the street. This trenchless technique minimises safety and environmental risks when working in the vicinity of busy roads and other utility infrastructure.

Jemena Managing Director Paul Adams said that the process is well established at Jemena.

“Jemena is very familiar with the goldlining process. We’re currently using it in two major rehabilitation projects in New South Wales to fix network leakage and ensure the future integrity of its gas pipes,”? Mr Adams said.

As well as safeguarding the network, the goldlining process allows for an upgrade to the network’s capacity from 7 kilopascals (kPa) to 210 kPa of pressure. This will allow for an increased supply to both meet future customer demand and to cope with new gas related technologies, such as continuous flow water heating systems

Over 5,500 km of gas distribution network infrastructure has been rehabilitated since 1987, including
150 year old cast iron gas mains in the Sydney distribution network and old high-density polyurethane (HDPE) pipes. Many of the cast iron pipes suffer from corrosion and the HDPE pipes often crack, resulting in leaks and a loss of natural gas.

The company’s recent major rehabilitation projects in New South Wales include:

  • The Macquarie Fields project, which started in November 2008 and includes 17 km of mains and 900 services and meter sets.
  • Rehabilitation of approximately 38 km of gas mains in the Liverpool-Smithfield area.

Expanding Victorian networks

As well as rehabilitating parts of the existing distribution network in Victoria, Jemena continues to expand its network to meet the increasing demand for natural gas.

Jemena’s gas network construction capabilities in the state are being used to supply gas to regional Victorian towns.

Distribution pipelines are being constructed on behalf of the asset owner. Multinet Gas, and Jemena will manage and operate these assets once they are completed. These include the South Gippsland and Yarra Ranges natural gas projects.

The South Gippsland Natural Gas Project is a $50 million transmission and distribution pipeline project supplying natural gas to five regional Victorian towns. As well as using clever engineering and technical solutions for difficult terrain – including a number of river and road crossings – Jemena overcame a number of commercial and regulatory barriers to finalise a gas retailer and arrange supply to the first resident in March 2009.

The Yarra Ranges Natural Gas Project was completed in late 2008, resulting the installation of about 180 km of new gas distribution mains and infrastructure. To date, this project has connected over 3,500 Yarra Range residents in nine small towns on the outskirts of Melbourne.

Repairing pipeline in Queensland

Jemena has recently completed the repair of a pipeline supplying a multimillion dollar aluminium smelter in Gladstone, Queensland, using a Petrosleeves product.

Employees from Tasmania, New South Wales and Queensland were trained in the installation of a Petrosleeves clamp, which enabled them to safely repair pipeline defects without stopping the supply of gas to the smelter.

Currently supplying some of the largest industrial users of natural gas in Australia, including Rio Tinto, Jemena draws on national expertise to facilitate the best and most cost effective solutions for customers.

“As Jemena delivers a complete range of engineering, design, construction and maintenance services, we’re also keen to explore opportunities for how these can be used to support the LNG industry in Queensland,”? Mr Adams said.

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