The pump station was constructed in the 70's and upgraded in 1987 as part of an amplification project to dispose of dry weather flows. The pumps and electrical controls were nearing the end of life and had numerous pump failures. The steelwork (access ladders) within the wet well were also non-compliant.
GO’s scope for this renewal project included the following civil, structural, mechanical and electrical works:
- New electrical building mounted on a structural steel frame
- Replacement of access ladders in the inlet manholes
- Refurbishment of penstocks in the inlet manholes
- Replacement of valves and pipework in the valve chamber
- Removal and replacement of pumps, pipework and access platforms within the main dry well sump, 10 m below ground
- Relocation an existing 1600kg SWL jib crane in the dry well
- Replacement of switchboards and electrical systems
- Temporary over-pumping for the duration of the works
GO worked with Sydney Water to develop a series of flow isolation / flow management (FIFM) plans, allowing all work within the inlet manholes as well as the changeover of pumps and pipework in the dry well to be undertaken at night during scheduled shutdowns.