Rehabilitation of Sewer Lines – Yarra Valley

Project Summary Sheet

Customer: Yarra Valley Water

Location: Hawthorn, Burwood and Brunswick, VIC

Delivered: 2014 - 2015

The Challenge

Cleaning and inspection showed that these lines were severely deteriorated with missing inverts at several locations.

The Solution

To address the challenges, the most suitable solution was our SPR™ EX – Expanda Pipe spiral wound PVC liner. It provided the customer with a circular liner with constant wall configuration without wrinkles, folds, steps or bulges in the pipeline which may lead to future blocking and ragging up or failure or provide challenges to plumbers connecting to an out of shape pipe.

The Project

In mid-2015 Interflow was issued with packages of DN225 sewer lines to rehabilitate as part of its term contract with Yarra Valley Water. The sewers were located in Hawthorn, Burwood and Brunswick in inner-Melbourne.

SPR™ EX – Expanda Pipe spiral wound liners are easily installed through voids, fractures and displacement without the need to excavate or complete pre-lining repairs and impact customers further thus saving costly civil excavations to complete the relining works.

Considerable care was needed to clean these sewers considering their delicate condition. Some spot repairs were required prior to structural lining in areas with partial collapses.

Following pipe preparation, Interflow’s spiral wound liners were installed without any excavation being required, either for launching the liner or for reconnection of house connection branches. A strong, circular liner was installed together with lateral connections using access only from existing maintenance holes.


* By limiting excavation, the project was carried out quickly with minimal disruption to the community.

* It was also completed at a fraction of the cost of pipecracking or dig-and-relay, the only other feasible solutions.

* Only spiral wound liners could provide a smooth, circular liner installed without disruption in the above inner Melbourne sewers.

Interflow is committed to offering its customers optimum solutions of the highest value for pipeline rehabilitation.