DLT have been involved in many oil & gas projects, mainly for the heavy lifting or skidding of large structures such as rig jackets, topsides and heavy vessels in refineries. We are able to design,
supply & operate heavy lifting systems to carry out these operations
together with full design of all temporary & strengthening works required. We own and operate a 3000 tonne capacity jacking tower system which has been developed to meet the needs of these projects.
Recent examples of our work include……….
DLT were sub-contracted to design, supply and operate a skidding and jacking system to incrementally erect a 26m x 22m x 140m high 2800 tonne jacket structure. The jacket was erected in 8 sections, weighing up to 660 tonnes each using our DL-TS3000 tower system. More >
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>
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.r recycling.
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.
DLT have supplied and operated many strand jack systems for the installation and replacement of thruster units weighing up to 50 tonnes on drilling ships and floating platforms. Strand jacks provide a compact and cost effective solution for handling heavy thruster units and we have also developed a system of modular power packs and jacks that can be taken through bulkhead doors into the thruster room . Our client list for this work includes Stenna Drilling, Jurong shipyard, Daewoo shipyard, Resource Rigging, Sea Drill, Frontier Drilling, Larsen OIl & Gas, Noble Corperation, Wartsila, Transocean and Napro Services. More>
FPSO mooring
yoke and pendulum installation using strand jacks >>
DLT have been responsible for the installation of a number of FPSO mooring yoke and pendulum structures weighing up to 1040 tonnes using strand jacks for lifting and final alignment to make the permanent connections. Our clients for this type of operation have so far been SMOE and Keppel Singmarine in Singapore, with work being carried out in Singapore and Azerbaijan. More >
DLT were responsible for the design, supply & operation of a modular jacking tower system that has so far been used to erect 58 vessels weighing up to 1,557 tonnes and up to 114.5m long. More>
DLT were responsible for the conceptual and detailed design of this 2500 tonne lifting capacity modular strand jack tower system, specifically designed for the Chinese refinery construction market. The tower system is owned and operated by the No 4 Construction company of SINOPEC and has many new features including self-erection and luffing under full load. More>
<< 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.
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.
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.
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:
B.P. Bruce Jacket (right) - 8,900 tonnes, B.P. Bruce Deck - 10,000 tonnes
Shell Nelson Jacket - 8,600 tonnes, Marathon East Brae Jacket - 9,800 tonnes
Shell Dunbar Jacket - 8,000 tonnes