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Australian floating crane Titan
''Titan'' was a floating crane that operated in Sydney Harbour from 1919 until 1991. She was fabricated in Carlisle in the United Kingdom, then sent to Cockatoo Island Dockyard in Sydney for assembly, before entering service with the Royal Australian Navy (RAN).
After being declared surplus to requirements, the crane became the property of Cockatoo Island Dockyard, which operated it until the dockyard's closure in 1991. Although heritage-listed, ''Titan'' was sold to a Singaporean company, and authorisation was given to tow her to Singapore in 1992. During the tow, the crane's barge inverted on 24 December, and the crane was scuttled five days later.
==Design and construction==
''Titan'' was fabricated in the United Kingdom during World War I by Cowans, Sheldon & Company of Carlisle, then transported to Australia in parts for assembly at Cockatoo Island Dockyard, Sydney.〔Jeremey, ''Cockatoo Island'', p. 75〕 Ordered on 5 October 1916, construction at Cockatoo commenced on 7 March 1917.〔Jeremey, ''Cockatoo Island'', p. 220〕 The crane was launched on 5 December 1917.〔 However, during construction, the 40-ton lead screws for the crane's jib arm were lost when the merchant ship ''Afric'' was torpedoed.〔 The crane could be used in a limited capability, although it was not until 1919 that replacement screws of sufficient quality were acquired.〔 ''Titan'' was completed on 3 December 1919.〔 On completion, the crane was handed over to the RAN.〔Lucas, ''Death of a Titan'', p. 20〕
''Titan''s cantilever-jib arm could reach above the surface at maximum extension.〔Jeremey, ''Cockatoo Island'', p. 187〕 The crane could lift up to at an arm radius of , or at .〔 Two counterweights were used to ballast the load; water ballast tanks could also be used, but this rarely occurred.〔〔 The crane was supported by a lattice mast fitted to a riveted-steel pontoon barge that was long, wide, and had a depth of .〔〔 The crane was not self-propelled, and required two or three tugboats to manoeuvre her around.〔 Power for lifting and rotating was supplied by a coal-fired boiler supplying three steam generators (two 220 kilowatt generators and a 44 kilowatt auxiliary).〔 The only connection between the crane arm and the lattice mast were drive shafts for the slewing (rotational) motors.〔 ''Titan'' had a maximum displacement of .〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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