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Prelude FLNG Turret Facts and Figures

  • This part of the turret weighs 4,300 tonnes.
  • The turret’s swivel design enables the facility to ‘weather vane’ by allowing the hull of the facility to rotate according to the prevailing wind, waves or current, while the turret moorings remain fixed to the sea floor.
  • The turret structure has been designed to enable the FLNG facility resist the most extreme weather conditions, including category five cyclones, and the facility will remain on location in all conditions.
  • The mooring system includes four groups of four mooring lines, sixteen in total, that will secure the facility to anchor points about 250 metres below the surface of the sea.
  • The mooring lines are a combination of chains and wire. These connect the turret mooring system to the 62.5 metre long and 5.5 metre diameter anchor piles secured to the seabed.
  • The mooring chain links, about one metre in length and among the largest in the world, are being made in Spain. 
  • The chain connectors that will link the Prelude FLNG substructure to its mooring lines are designed to withstand the breaking load of the largest type of offshore chains and to operate for 25 years.
  • The subsea connections that extract and control the flow of gas from the reservoir also connect via the turret. The turret was designed by SBM Offshore in Monaco and construction has been underway at Dubai DryDocks World since 2012.

Prelude FLNG Background

  • Prelude FLNG is a natural gas project located approximately 475km north-north east of Broome in Western Australia.
  • Shell is the operator of Prelude FLNG in joint venture with INPEX (17.5%), KOGAS (10%) and OPIC (5%) and working with long-term strategic partners Technip and Samsung Heavy Industries (the Technip Samsung Consortium).
  • The project will be the first to use Shell’s revolutionary Floating Liquefied Natural Gas technology, which allows for natural gas to be extracted, processed, stored and transferred at sea.
  • FLNG removes the need for pipelines to shore, dredging and onshore works and therefore significantly limits the disturbance to the surrounding environment and reduces development costs.
  • Shell FLNG can be deployed in a range of field development scenarios, with high production rates and with a wide range of gas compositions.
  • Shell was the first to make FLNG a reality. In May 2011, Shell announced final investment decision on Prelude FLNG.
  • Once operating, the Prelude FLNG facility will produce 3.6 million tonnes per annum (mtpa) of LNG, 1.3 mtpa of condensate and 0.4 mtpa of LPG.
  • The Prelude FLNG facility will be 488 metres long and 74 meters wide. It will weigh more than 600,000 tonnes with the cargo tanks full.
  • The FLNG design has gone through extensive testing programs and simulations to ensure it has the ability to remain connected and moored to the sea floor throughout all weather conditions.

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