The aim 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 tonnes and jacket dry weight up to 1000 tonnes.
“By developing this time and cost-saving solution, we hope to create a wider awareness among contractors within the region in order that they may adopt similar methods in the removal of multi -platform fields,” said Jean-Baptiste Meier, Longitude’s lead engineer.
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 solution is a barge concept that uses reverse float-over and on-board lifting methods to remove both the topside and substructure using the same vessel. For the development of the primary float-off lifting system, Longitude partnered with 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 underwater disposal for the substructure and load in to a disposal yard for the topside. It also has the ability to accommodate 60 operational and marine crew for a period of up to 40 days.
PTTEP is currently in discussion with Thailand’s Department of Mineral Fuels (DMF), the government body regulating offshore oil and gas operations, which will sanction the decommissioning work, for the start of their removal program which is due to commence in the coming years.
With the implementation of new decommissioning regulations, all concessionaires must submit the decommissioning plan with cost estimation to DMF for financial security placement at the first stage.
(marine crane;offshore crane)
Knuckle boom crane
OUCO Marine/Offshore knuckle boom cranes are designed to lift high loads with extended jib and provide the operator with great flexibility during lifting operations. OUCO Marine/ Offshore knuckle boom cranes range is available from 0.5t to 150t. The knuckle boom cranes are with easy maintenance and efficiency by taking small space. The improved level of control makes the crane ideal for offshore lifting operations in higher sea states to deal with big waves. Another advantages for OUCO Marine/Offshore knuckle boom cranes are:
Hydraulic type makes the crane maintain easily;
Flexibility by extending booms;
Smaller ones takes very limited space on the vessel/ship/shipyard;
Bigger ones can do heavy duty loads in several working conditions.
The innovative design of the knuckle boom crane allows workers to perform great number of logistic tasks. The function of these heavy duty machines is to load and unload heavy materials from one location to another.Due to its durable construction technologies and precision, knuckle boom crane provides an extra solid hand to any workforce. With its great lifting power, payload space and maneuverability, knuckle boom crane successfully replaces manpower.
Typical Applications: Provision cranes, Service cranes, Container and cargo handling cranes.