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Shore Approach and Crossing Design – Pluto LNG Project

Shore Approach and Crossing Design – Pluto LNG Project

Benefits
The shore approach and shore crossing design resulted in a very cost-effective solution from both a cost and schedule perspective, with manageable levels of risk and limited environmental impact. The innovations contributed to the Pluto Project winning an Engineering Excellence Award by the Institute of Engineers WA in 2012.
Background
Woodside Energy Ltd engaged Atteris in 2005 to design the shore approach and shore crossing for the Pluto Export Trunkline System, which comprises a 36-inch gas pipeline and a 4-inch MEG line.
Work Performed by Atteris

The early concept design considered several pipeline route options, and as the design progressed, a final route was selected in 2006, with a landfall at Holden Point on the Burrup Peninsula.

The shore approach design for the trunkline system included developing engineering solutions to deal with:

  • Rough seabeds with exposed limestone rock formations
  • Erodible calcareous seabed sections comprising silts and sands, including “glay soils”
  • Laying the Pluto Trunkline System close to the Pluto LNG Offloading Jetty under construction, two existing large diameter gas pipelines, a dredged material dumping ground
  • The crossing of the NWS shipping channel
  • A shoreline comprising igneous hard rock and a major heritage site.
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