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Sector
Industrial
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Value
$300.00 million
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Developer
External Developer
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Start date
May 2005
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Completion date
November 2006
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Stage
Completed
The Perth Seawater Desalination Project was awarded to the Multiplex Degremont Joint Venture (MDJV) in April 2005 and scheduled to provide first water into Perth’s integrated water supply scheme (IWSS) by November 2006 –18 months after award. The scope of the plant included the design, procurement, construction and commissioning of the following:
Plant Component:
- 20 x 30 x 10m deep seawater pumping station;
- Phase 1 Filtration through 24 large dual media pressure filters;
- Phase 2 Filtration through final nutrient / contaminant removal through 14 cartridge filter vessels;
- 1st pass reverse osmosis through 12 racks operating at pressures up to 64 bar;
- 2nd pass reverse osmosis through 6 racks operating at pressure up to 15 bar;
- Disinfection Facility (chlorine);
- Stabilisation facility using lime and carbon dioxide injection;
- Flouridization using fluorosilicic acid;
- 12,000 m3 post tensioned concrete drinking water storage tank;
- Drinking Water Pumping Station;
- Wastewater Treatment facility;
- Administration and Workshop Facility;
- 132kV switchyard.
Marine Component
- Offshore Dredging using both cutter suction and backhoe dredges including construction of temporary coffer dam for onshore disposal of dredged spoil;
- 500m of 16m deep sheet piling for onshore pipeline trench and 200t of support steelwork including temporary groyne construction;
- On shore excavation via use of long reach excavators;
- 400m of 2.3m dia GRP Intake Pipeline, 600m of 1.6dia GRP Outfall pipeline and associated 48 port diffuser;
- 8m high x 6m diameter subsea marine intake structure;
- Backfill of offshore pipelines using split hopper barges;
- Establishment of backfill material storage facility and associated temporary wharf loading facility; and
- Silt Screen Management throughout Marine works to satisfy EPA requirements.
The project provided first water as requested by the Government of Western Australia by November 2006 – only 18months from the date of Award. Furthermore, in spite of the tight time constraints and other challenges faced by the team the project was not only produced on time but was also delivered under budget.
The project was awarded Australia's Most Outstanding Example of Construction Excellence at the 2008 Australian Construction Achievement Awards.