DECK EQUIPMENT
with the rail tracks widened to suit the Russian standard gauge. The owner also decided to automate the mooring winches. In a short time Hatlapa was able to supply
new electrically driven winches for automatic mooring operation, with a nominal pull of 100kN. Uetersen-based Hatlapa has now supplied
more than 500 winches with frequency inverter controlled AC motors, and notes that this feature provides the winches with creation of nominal pull even at zero speed. ‘This is a decisive advantage for mooring winches in their holding
function and is also applicable as ex-proof design for all kinds of tankers and gas carriers,’ said the company. The company also noted recently that,
following concentration in the Norwegian market, Hatlapa is now one of two manufacturers of large low pressure hydraulic high-torque motors with pressures of 65bar. In April 2006, the managing partners at
Hatlapa decided to take over the core assets of the ship technology and cargo handling division of KGW, creating a new company with a maritime focus in the form of KGW
Frequency control for simpler installation W
HILE many LNG carriers specify hydraulic drives for their deck machinery, some
yards and owners are favouring electrically- driven winches with frequency converter control, and Rolls-Royce is providing systems to meet their requirements. Electric deck machinery has benefits related to its installation, and in a modern shipyard the crucial installation lead time can be shortened due to the easier cable work, and for the owner this system offers benefits in the form of reduced maintenance costs. DSME (Daewoo Shipbuilding & Marine
Engineering) is a well-known builder of LNG carriers, and two ships for Korea Line Corp being built by that company will be equipped with Rolls-Royce frequency-controlled electric deck machinery. Hull 2260 is a 145,700m3 ship and Hull 2261 a 151,800m3
vessel. Rolls-Royce’s scope of delivery includes two
combined anchor and mooring winches and seven mooring winches. The mechanical elements of the winches and cable lifters are built-up on the modular concept, designed for easy mounting, and the electric motors are controlled by frequency converter systems to give stepless speed control of mooring lines and anchor chain. In this case, the windlass handles 107mm chain and the split type mooring drums store 275m of 42mm line with an 11m-long nylon tail rope.
Frequency-controlled electric winches – such as these Rolls-Royce models - can be an attractive solution.
On mooring winches speed is variable from zero
up to 15m/min under a 30tonne load, and 45m/min on a light line. The mooring brakes are of fail-safe type applied by spring and released hydraulically, and the speed of the winches can be controlled both
locally and at either side of the ship. Windlasses are equipped with remote anchor lowering system. With this fully automatic electro hydraulic system the smooth and accurate lowering of anchors is controlled by push button.
Marine GmbH. Cruise lines, navies and many customers in the US have been among KGW’s preferred clientele. Hatlapa has also recently joined forces with Oil States Skagit Smatco, a well known US offshore service company, with whom Hatlapa will produce large towing winches of circa 2000kN capacity. In doing so, Hatlapa is to some extent ‘returning to its roots’ in the offshore industry of the 1980s. Its know-how – especially with regard to the high power low pressure Hatlapa hydraulic motor – was taken into consideration by Oil States when looking for a partner.
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THE NAVAL ARCHITECT FEBRUARY 2007 51
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