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A combination of movements from the two winches enables lifting, transfer and lowering of the cargo.
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Cargo handling wires run from two winches and join at the hook. Topping wires fix the height of the derricks and stays to the deck may be used to prevent fore and aft movement. One derrick is positioned over the quayside and the other almost vertically over the hold. it will hold the load if power fails or the machine is stopped.Ī derrick rig is known as 'union purchase'. Manually operated band brakes may be fitted and the drive motor will have a brake arranged to fail-safe, i.e. A warp end may be fitted for operating the derrick topping lift. In the cargo winch, spur reduction gearing transfers the motor drive to the barrel shaft. The unit is rated according to the safe working load to be lifted and usually has a double-speed provision when working at half load. Each method has its advantages and disadvantages for particular duties or locations.Ĭargo winches are used with the various derrick systems arranged for cargo handling. Two forms of power are currently in use: hydraulic and electric. The drive force and control arrangements adopted will influence the operations. The operations of mooring, cargo handling and anchor handling all involve controlled pulls or lifts using chain cables, wire or hemp ropes. Other items include lifeboats and life rafts, emergency equipment, watertight doors, stabilisers and bow thrusters. These include deck machinery such as mooring equipment, anchor handling equipment, cargo handling equipment and hatch covers. There are the various items of machinery and equipment found outside of the machinery space.