Tenth Street Elevated Storage Tower Upgrade

Design and construction of a new network of pipes and valves for Lower Murray Water's Tenth Street Tower, which supplies pressure to Mildura's potable water reticulation.

Scope

Keystone was engaged to design and construct a new network of pipes and valves for Lower Murray Water's (LMW) Tenth Street Tower in Mildura, a critical infrastructure that supplies pressure to the township's potable water reticulation. The project arose from a 2020 condition assessment that identified the urgent need to replace two corroded expansion joints located 20 meters above ground and five aging isolation valves, some of which were locked in an open position, making isolation impossible.

The scope included the installation of five new 450mm valves, dismantling joints, and the fabrication and installation of new 502mm MSCL pipework. Given the criticality of the tower, the project had a strict 12-week timeframe for design, procurement, and construction. Keystone's solutions also addressed safety concerns, such as the relocation of an isolation valve that was previously in the middle of the road, and the design of new inspection pits, including a 5m x 2.4m pit at the base of the tower with steel restraints anchored to concrete. Additionally, two stainless steel 450mm expansion joints were designed and installed 30 meters in the air to further improve system reliability.

Safety First

Keystone installed sampling points within the main tower, providing LMW staff with easy access for future maintenance and testing. The newly designed pit lid also contributed to safety improvements by incorporating a built-in handrail, offering operators enhanced protection whilst working around the pit.

Innovative Thinking

This project presented several innovations and adaptive solutions as it progressed. With limited historical data at the outset, Keystone and its design partners, Loetis, worked swiftly to devise effective strategies. Some notable innovations included: - Temporary MSCL Support: Collaborating with a structural engineer, Keystone developed a custom C-shape steel brace installed around the existing flanges using a combination of welds and tensioned bolts. This system provided temporary support for the MSCL pipework without requiring large cranes, minimising street closures and disruptions. The process was executed seamlessly, with no impact on the existing structure. - Electrical Hoist System: Keystone and the structural team designed an electric hoist to raise and lower old and new expansion joints between the top platform and the ground. This system, which also transported tools and fittings, eliminated the need for heavy cranes and allowed precise manoeuvring of the joints without manual handling risks.