THE CLIENT: Greater Western Water (GWW)
GWW provides drinking water, sewage, trade waste and recycled water services throughout Inner and Western Melbourne. GWW owns extensive infrastructure requiring ongoing maintenance. Programmed Facility Management (PFM) is GWW’s Principal Operations and Maintenance Contractor. Rangedale Group has been a PFM contractor for over 10 years and were entrusted to deliver this complex and critical project.
THE CHALLENGE:
Rangedale Rehabilitation and Renewals was contracted to reline 14 Sewer maintenance holes, each with highly variable maintenance conditions hindering access in areas where GWW’s key customers discharge industrial waste (trade waste) into the sewer system.
To rehabilitate these maintenance holes, we faced three major challenges:
1) The project area was a designated No-Go Zone. Working downstream of the industrial waste discharge points, the team faced high flows of hazardous effluent that required a diversion of sewer inflow and thorough risk management.
2) Each maintenance hole was heavily degraded. Decades of highly corrosive effluent passing through the system corroded the concrete causing significant damage.
3) The high-risk profile of the project meant GWW needed a contractor who could minimise entry.
Rangedale was tasked with delivering a low-risk design and to construct maintenance holes rehabilitation solution.
THE RANGEDALE SOLUTION:
Traditionally in Australia, such maintenance hole rehabilitation solutions rely on the integrity of the existing entry, such as Protective Coatings, to bond to the maintenance holes lining. Other systems require extensive manned- entry to install liners, or expensive preliminary maintenance hole modification works before a liner can be slipped down an existing maintenance hole.
Rangedale offered a structural lining system that did not rely on the integrity of the maintenance hole. Rangedale’s Vertliner is a UV Cured in Place Pipe (CIPP) liner, manufactured to the exact size of each maintenance hole. The liner was installed from surface level without entering the maintenance hole, then inflated with air pressure and rapidly cured using a Ultra Violet (UV) light train mounted inside the inflated liner.
The end product was a structural Glass Reinforced Plastic (GRP) pipe liner, installed and bonded to the original maintenance wall.
THE OUTCOME:
Using our unique UV CIPP technology, backed by the best-in-class Vertliner, Rangedale installed 14 maintenance hole liners with no manned entry. We then completed reinstatement works, installing new ladders and droppers.
This state-of-the art technology is new to the Australian rehabilitation and renewals sector and represents industry leading best practice.
Learn more about our relining services
Watch a video on our UV Light Train Relining System
Date: February 2022
