Drag chains protect offshore hoses and cables
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Kabelschlepp Metool product story
Edited by the Engineeringtalk editorial team
Oct 19, 2004
Kabelschlepp Metool has supplied five drag chains, including what is believed to be the world's largest ever side-running design, for offshore platforms in the Caspian Sea.
Kabelschlepp Metool has supplied five drag chains, including what is believed to be the world's largest ever side-running design, for offshore platforms in the Caspian Sea.
Supplied as a package, complete with structural steelwork and hoses, the five chains are of stainless steel construction to withstand the harsh offshore environment.
The platforms are subject to high potential seismic activity and special designs have been developed to ensure that the drag chains can remain intact following a seismic event.
The upright drag chains are all from Kabelschlepp Metool's heavy-duty 7000 range and are deployed in pairs with one chain inside another in order to carry more facilities within the same space.
They have a maximum travel of 28.6m and carry high pressure hoses, water, power and control cables to the drilling derrick, controlling movement in two directions while preventing the hoses and cables being damaged or becoming entangled as the derrick is skidded between well slots.
The side-running chain is a special design, also of stainless steel, optimised to make best use of the space available on the deck.
It carries a number of high pressure hoses, including two 5in mud lines, a 3in cement line and an 8in fire water/deluge line.
Kabelschlepp invented the drag chain 50 years ago and its subsidiary Kabelschlepp Metool pioneered concept in a variety of oil-drilling applications, including turret transfer systems for FPSO vessels, telescopic personnel bridges, BOP actuation diverters, BOP cranes, riser pipe handling systems and jack-ups for skid-off or cantilever drilling.
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