| Dorman Long Technology | ||
| Reference projects - Offshore construction |
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Maari
Field Wellhead Platform, Jacket erection, Malaysia |
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| Strand jack
systems for offshore lifting applications DLT strand jacks are suitable for use in offshore heavy lifting and platform installation applications. Recent equipment supply contracts for our computer controlled strand jack systems include a 16 x DL-S588 strand jack system for the offshore installation of the BARD wind farm transformer platform (see www.bard-offshore.com for details). |
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| Recover of mooring yoke to release FSO from buoy, Mediterranean Sea DLT were sub-contracted to provide a strand jacking system to raise a mooring yoke to release an FSO vessel from its mooring buoy where it had be located for 20 years. The original 1000te capacity long stroke ram used to install the yoke was unserviceable. DLT engineered a system using 2No DL-S418 strand jacks mounted on a T-frame attached to the FSO using the existing long stroke ram mounting point. The jacks were powered by a DL-L114/4/D diesel engine operated hydraulic powerpack. The Vessel was sucessfully released and taken to shore for recycling. |
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| Sea Drill
pontoon launch, Singapore DLT were sub-contracted to side shift and launch 2 No 3600 tonne pontoon units at the Jurong Shipyard, Singapore, in May and June 2007 for the Sea Drill floating platform No 8. The first pontoon was launched 125m down a 6 degree slope into the water in May. The second pontoon was side shifted 100m into position for launching and then launched down the same slope as the fist pontoon. The pontoons were supported on inflated air bags for all these operations and moved using 2 no DL-S185 strand jacks and 2 No DL-L30F/1/350/120/E power packs for a launching speed of 17 m/hour, controlled using the DL-P40 computer control system. |
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Corocoro
FSO Mooring Line Tensioning, Venezuela DLT were sub-contracted to assist in the installation of a FSO mooring line system 32Km offshore in the Corocoro Oil Field, Venezuela. DLT designed and supplied the strand jack tensioning system to pull pairs of mooring lines toward one another causing their anchors to plough into the sea bed and subsequently test load the mooring lines to a 700te tension. More> |
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Supply
and operation of strand jack systems for replacement of thrusters |
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Load out
of FPSO pontoon, Korea DLT were responsible for the design, supply & operation of a strand jack system to load out a 14,500 tonne FPSO pontoon onto a delivery ship, for main contractor Hyundai. The deck was moved 125 metres using four 580 tonne capacity strand jacks. |
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FPSO mooring
pendulum installation, Singapore DLT were responsible for installation of 2 No 120 tonne mooring pendulums for SMOE in Singapore, using strand jacks to achieve a positional alignment of +/- 0.2mm for installation of 5 tonne pitch pins. |
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| Dismantling
of the Brent Spar oil storage platform DLT were responsible for the design of a 2300 tonne lifting capacity lifting gantry for handling cut sections of the Brent Spar as it was decommissioned in a Norwegian fjord in 1999. The gantry used 4 No 580 tonne capacity strand jacks for lifting and a gripper jack system for longitudinal movement over the decommissioning barge. The legs and cross beams of the gantry structure were made from a proprietary tower system which were connected and braced using purpose designed steelwork. |
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Offshore
load outs in Scotland DLT (Zalcon) were responsible for the design, supply & operation of strand jacks systems for the load out of the following offshore structures in the 1990’s: |
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| B.P. Bruce Jacket (above) | 8,900 tonnes |
320m load out |
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| B.P. Bruce Deck | 10,000 tonnes |
180m load out |
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| Shell Nelson Jacket | 8,600 tonnes |
330m load out |
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| Marathon East Brae Jacket | 9,800 tonnes |
280m load out |
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| Shell Dunbar Jacket | 8,000 tonnes |
250m load out |
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