The scope included the design, procurement and construction of a large pressure reducing station (PRS). The PRS was located within the Melbourne Water pipeline reserve in Berwick.
The design requirement for the intended operation of the PRS was very complex. The aim of the PRS was to reduce the pumping head generated from the Victorian Desalination transfer system at the Melbourne Water connection point in Berwick.
Flow rate: 325 MLD
Pressure control (approx.): 240m to 140m
Valve sizes: 2 x 600mm in 800mm body and 1 x 450mm
Pit: Reinforced concrete 8m x 6m x 2.7m deep
The procurement of the pressure reducing valves (PRV) was identified as a long lead item. This is mainly due to the size of the PRV and also customisation involved to meet the requirements of the design.
Construction of the PRS was in a complex location with residential houses on both sides of the easement, existing large diameter water mains owned by Melbourne Water on both sides of the PRS with separation less than 2 metres and limited access.
In consultation with Melbourne Water, the connection of the PRV to the Melbourne Water pipework was successfully completed.