Hunter Water embraces Primus Line pipe relining technology

More and more water suppliers are using the Primus Line System for their pressure pipeline renovation projects. Hunter Water has even included the German technology in its portfolio as the standard remediation technology.

Rädlinger first developed the Primus Line system in Germany 25 years ago, and in 2013 the company made its first contacts with Australian asset owners.

Since its first installation in Australia, Primus Line has developed into the preferred solution for pipe rehabilitation in sensitive and inaccessible areas. Primus Line is a special technology for the trenchless rehabilitation of pressure pipelines, which, due to its curvature, appeals primarily to water suppliers as the preferred method.

Primus Line’s director for Australia and New Zealand, Heiko Manzke, says the company also doesn’t need access to the entire asset. “Primus Line is characterized by the combination of flexibility and high material strength,” he says.

“This makes it possible to drive through curves of up to 45 degrees and at the same time to implement installation lengths of over 1000 m in one section. Only small construction pits or access shafts are required. The use of machines and interventions in the environment are minimal. ”

The Primus Line system was recently used to rehabilitate a water pipe for a local utility in New South Wales. Hunter Water provides drinking water, sewage, recycled water, and some rainwater services to a population of nearly 600,000 inter-household residents in the Lower Hunter Region.

The distributor was specially developed for this project

The collaboration between Primus Line and the state-owned company began with initial on-site visits, followed by information events to improve understanding of the technology.

The first action was an emergency project for a sewage pressure pipe. The technology of the Primus Line demonstrated its versatility to Hunter Water. On the utility’s next venture, Hunter Water took a new approach not previously seen in the Australian pipeline market: a multi-liner solution.

Justin Watts, Hunter Water Group manager for Asset Solutions, says there were a number of challenges related to repairing the DN 900 MSCL water line that was crossing under a freeway exit.

“This main was a critical water supply for the Newcastle and Lake Macquarie regions. Due to the timing of the outage, the Newcastle 500 Supercars race was expected to attract a large number of visitors to the area and a quick, non-destructive restoration was sought as the temperature rises, ”he says. “The ability of the Primus Liner to be installed through bends prompted Hunter Water to look for solutions with this product. With a maximum product diameter of DN500, a technical solution was required to ensure that the capacity was maintained. “

In order to ensure the best possible use, the energy supplier decided on the Primus Line 3-in-1 solution, implemented by the proven Primus Lines partner Interflow. The installation of three Primus Liners DN 450 PN 16 with an inside diameter of 396 mm would give Hunter Water a work performance of almost 60 percent.

The section of the pipeline in need of rehabilitation was around 140 m. In addition, the coefficient of friction of the Primus Liner is 0.028 lower than the coefficient of friction of the existing main line. The results of Hunter Water’s calculations ultimately indicated that a reduction in diameter would be acceptable.

“With this project we were able to convince the market that we can also offer engineering solutions,” says Manzke. “It also clearly shows Hunter Water’s spirit of innovation and openness to new technologies. Both of these will enable Hunter Water to continue to operate its 10,000 km of water and sewage pipes safely and reliably in the future. “

Because Hunter Water has successfully used the Primus Line for both sewer slope and water pipes, the technology has become part of the standard range of products for pressure pipe rehabilitation. Today, a number of water and sewer pressure pipeline projects using the technology have been completed.

Hunter Water has installed Primus Line in a number of situations including water pipe rehabilitation options. It has proven its worth in the rehabilitation of water pipes in poor conditions and hard-to-reach areas.

Further information can be found on the Primus Line website.

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