New Decommissioning Barge Concept

Longitude Engineering (Longitude), part of the London Offshore Consultants (LOC) Group, has developed a new decommissioning barge concept for the removal of small oil and gas platforms for the PTT Exploration and Production (PTTEP), a subsidiary of the Thai state-owned oil company.

The primary aim of the works was to develop a viable and cost-effective alternative to conventional ‘reverse installation’ through the use of heavy lift crane barges, for the removal of the topsides and jackets. The focus being the removal of 90-100 of PTTEP’s minimum facilities platform assets in the Gulf of Thailand, which have topside weights up to 800 metric tons and jacket dry weight up to 1,000 metric tons.

Longitude’s contract was to deliver the conceptual naval, structural, mechanical and electrical engineering, along with outline operational procedures, schedule and CAPEX & OPEX costing for the new removal concept.

The developed solution is a barge concept that utilizes reverse float-over and onboard lifting methods to remove both the topside and substructure utilizing the same vessel.

For the development of the primary float-off lifting system, Longitude partnered with German-based hydraulics specialist, Bosch Rexroth, to develop a heave compensated hydraulic lifting and skidding system.

The resulting vessel design can accommodate the removal of different types of topsides and jackets, without modifying the barge, from removal preparation stages, lifting, topside skidding and securing to u....

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