Metro Trains – Water Main Repair (Case Study)

Greenline Pipe Repairs Installation

Using our Greenline solution, Nuflow South West repaired a 21 metre long faulty pipe (150mm water main) made of a combination of ductile steel and copper. The client, Metro Trains, requested repairs for the pipe located at the Metro Trains Service Depot in Cooper Street, Epping.

The problem

Metro Trains were advised by the local water authority that a constant un-metered water leak outside their service depot needed to be repaired immediately. The water main that had failed was feeding the fire hydrant booster for the depot.

It was unknown at the time the leak was identified, but the reason the pipe leaked was the failure of the copper pipe where it joined the ductile steep pipe. The copper acted as a sacrificial anode, causing corrosion, and the copper pipe eventually failed.

To make this repair more complex, the 150mm main pipe ran under a main road. This made it impractical to excavate the pipe to replace and to find the leak. The constant leak had also started to show signs of causing damage to a main road, so the repair was urgent.

The solution

Nuflow South West completed relining the pipe and fixed the leak without causing any disruption to the depot and without the necessity of closing off a busy main road to traffic in only three days.

The cost saving was huge compared with the costs of the traditional ‘dig and replace’ method which takes longer and requires expensive heavy machinery and labour costs.

Additionally, relining the pipe using Greenline has stopped any future failures in the line as the copper pipe will no-longer act as an anode, ending the corrosion permanently.

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Northland residents and businesses will now have access to innovative pipe re-lining solutions that change the game in pipe repair. Nuflow, New Zealand’s leading pipe relining company, is expanding its operations with a new franchise launching in the Northland region. This expansion brings their "pipe within a pipe" technology to address the area's aging infrastructure challenges. Zane Britton, owner of the newly established Nuflow Northland franchise, brings extensive industry experience and a vision for delivering advanced pipe rehabilitation solutions to the region. "After following Nuflow's developments through industry conferences and seeing their strong market presence, I was drawn to their comprehensive range of techniques and products," says Zane. "The technology offers superior solutions for Northland's unique challenges, particularly addressing years of poor installations that have left their mark on local infrastructure." The franchise will offer Nuflow's complete suite of pipe rehabilitation services, including their well-known and well-regarded trenchless technology that minimises disruption while maximising efficiency. This no-dig approach is particularly valuable for Northland's aging pipe network, offering a modern solution to traditional plumbing problems. Zane emphasises the practical benefits of Nuflow's technology for the region: "With the significant number of aging pipes in Northland, our technology provides a cost-effective solution with reduced health and safety risks. The niche market opportunities here align perfectly with Nuflow's capabilities." The new franchise aims to service all sectors in the region, from residential to commercial and industrial clients. "Every sector can benefit from these solutions," Zane notes, "our goal is to keep delivering quality results while also training new apprentices to support the industry's future." When asked about the support received from Nuflow, Zane praised the comprehensive training program: "The support and training have been excellent, providing us with everything needed to deliver these specialised services effectively." With Nuflow’s trusted materials and up to 50-year product warranty backing their services, Northland residents and businesses can now access state-of-the-art pipe relining solutions that promise to address their infrastructure needs efficiently and effectively. Looking ahead, Zane has clear objectives: "Our vision is to continue growing while maintaining high-quality service delivery and contributing to the industry's development through apprenticeship opportunities." As Nuflow Northland commences operations, local property owners and businesses can look forward to accessing innovative pipe rehabilitation solutions that offer an alternative to traditional repair methods, backed by proven technology and comprehensive support.

Northland residents and businesses will now have access to innovative pipe re-lining solutions that change the