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Projects

SPM and PLEM System and Offshore Pipeline for Brunei Methanol Plant

Client:  Brunei Economic Development Board
Location:  Brunei
Start:  September 2008
Finish:  March 2010
Contract Type:  Construct only
Value:  A$106 million (at 30 June 2009)
Description:  

The Brunei Economic Development Board (BEDB) awarded the SPM and PLEM system and offshore pipeline contract for the Brunei Methanol Plant to Leighton International*. 

The project involved installation engineering, procurement, installation and commissioning of a 24-inch diameter 13.4-kilometre long offshore pipeline, the associated pipeline end manifold (PLEM) and the single point mooring (SPM) system.

The facility is an export terminal for the 2,500 tonnes per day methanol plant being developed in Sg Liang Industrial Park by the Brunei Methanol Company. This industrial park is a significant undertaking by the Brunei Government to diversify its economy towards more non-petroleum related businesses.

The pipeline system was designed to handle a flow of up to 1,600 tonnes per hour of methanol. The SPM ia a catenary anchor leg mooring (CALM) type turret buoy with a capacity to accommodate 46,000 dead weight tonne (DWT) tankers. It is located in waters approximately 25 metres deep.

The scope of works included: 
  • offshore pipeline installation incorporating four subsea pipeline crossings and a shore pull;
  • installation of six anchor chains and marine anchors, PLEM tie-in to offshore pipeline, under-buoy hoses for PLEM tie-in to buoy and floating hose connections;
  • onshore pipeline installation approximately 600 metres in length, incorporating three road crossings and one river crossing, tie-in to offshore pipeline and terminating at BMC property fence line;
  • approximately 3 kilometres of post trenching to bury the near shore pipeline; and
  • pre-commissioning and commissioning of pipeline, PLEM and SPM.

The offshore pipeline installation was by the S-lay method using the Leighton Faulkner pipe-lay barge, a Leighton Group asset.

Other marine equipment mobilized for the project included a 2400Hp anchor-handling tug, a 2000Hp tug, two 180-foot supply barges and a crew boat.

*As of 30 June 2011 Leighton International’s activities were transferred to other Group companies. Leighton International project descriptions have been retained for historical purposes.