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The winch had 2,500 feet (760 m) of 2 + 1 ⁄ 4-inch IWRC 6×37 wire rope with a poured end fitting and a breaking strain of 424,000 lbf (1.89 MN). The cable weighed approximately 8.5 lb per foot (12.6 kg/m), making the weight of the wire approximately 21,500 lb (10.75 short tons ) excluding the weight of any chain bridle used on the ship being ...
Each drum carries 3,000 feet (910 m) of 2 + 1 ⁄ 4-inch-diameter (57 mm), drawn galvanized, 6×37 right-hand lay, wire-rope towing hawsers, with closed zinc-poured sockets on the bitter end. The towing machine uses a system to automatically pay-in and pay-out the towing hawser to maintain a constraint strain.
Traditionally, fibre optic cables were pulled through cable ducts in the same way as other cables, via a winch line. Every time the fibre passes a bend or undulation in the duct, the pulling force is multiplied by a friction-dependent factor (which can be reduced by using lubricant [2]). This means that the higher the local pulling force is ...
The winch consists of a gas-powered engine, spool, rope, frame, and sometimes a simple transmission. The person being towed walks (or swims) away from the winch, while extending the rope. When the winch is engaged, it pulls the boarder in at a speed ranging from 25 to 40 kilometres per hour (16 to 25 mph).
In offshore applications, huge lengths of rope are often housed on drums. The anchor winches on Saipem's Semac 1 pipe laying barge, for example, each hold 2,800 metres of 76mm (3 inch) diameter wire rope in 14 layers. Saipem's Castorone, the world's largest pipe laying vessel uses a wire rope that is 3,850m long and 152mm in diameter. It weighs ...
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