Woodside/Pluto LNG project - offshore dredging and backfill

 

Challenge

The Pluto gas field is located approximately 180 km off the coast of Western Australia. Since its discovery in 2005, Woodside Burrup Pty Ltd (WBPL) was determined to make this the fastest developed LNG project ever, with the first LNG produced in 2011.

Gas and condensate are transported through a 36” diameter gas trunk line from a platform to the Burrup Peninsula LNG Park, which is located near Dampier.

For the construction of the gas trunk line, WBPL engaged several contractors and Tideway BV was awarded the contract to dredge a trench for a 35 km stretch of the pipeline and to backfill it after the pipelay was completed.

Our solution

Dredging and backfill were executed with the Trailing Suction Hopper Dredger Nile River. The dredge was configured to backfill through one of the suction pipes to guarantee a controlled disposal of the backfill material and an on board survey system enabled Tideway to closely monitor the progress.

More Tideway projects

Part of the pipeline route crosses the environmentally sensitive Mermaid Sound. Tideway always aims to limit environmental impact and it took measures such as installing turtle deflectors near the drag head, green (anti-turbidity) valves in the hopper overflow system and production planning took any coral activity into account. Tideway’s efforts were recognised when it received Woodside’s 2009 Sustainability Award for Environment and the Chairman’s Overall Sustainability Award!

 

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