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Dorbyl Building Four Schottel Rudder-Propeller Tugs The Schottel Group of Compa- nies, Spay/Rhine, Germany, has received an order to supply eight rudder-propellers for four trac- tor tugs building in South Africa. The twin-screw tugs are being built for South African Railways, Johannesburg, by Dorbyl Marine, Durban, and are scheduled to be delivered in mid-1982 and early 1983. Two of the tugs will serve in the Port of Durban and the others in East London. SOUTH AFRICAN Length overall 107' Beam 31 Depth 13'// Draft 19' Displacement (approx.) 500 tons Bollard Pull 40 tons Power (2) MAK Diesel engines type 6M332, each developing R.R. TUGS 1,100 kw (1,500 hp) at 850 rpm Propulsion (2) Schottel-Rudder- propellers type SRP 1100/1100 Gear reduction 4.12:1 Speed 12 knots Propeller diameter 2,400 mm in nozzles Class Lloyd's Register of Shipping Silhouette of the four Schottel-Rudder-propeller equipped tugs ordered by the South African Railways (S.A.R.), Johannesburg. March 1984 and then towed to the Arctic Ocean. The drilling rig will be used for the oil development now be- ing conducted in the Canadian Reaufort Sea by Gulf Canada Resources Inc. Conventional type oil drilling rigs cannot be used in the Arctic Ocean because of severe problems with solid and drift ice. As a result, the usual method has been to install rigs on artificial islands constructed of earth or sand. This method requires that a new artificial is- land be constructed in the harsh working environment every time the drilling point is changed. The new mobile Arctic caisson rig can be seated on a simple foundation built in the sea. When drilling at any point is com- pleted, the rig is floated and moved to the next drilling point, as in the case of conventional rigs. Ishikawajima-Harima Heavy Industries Co., Ltd., jointly with Mitsui & Co., Ltd., both of Japan, recently received an order for a mobile Arctic caisson rig, the first of its kind in the world, from Gulf Canada Resources Inc., a group company of Gulf Oil of the USA. The contract was con- cluded recently between the par- ties concerned in Canada. The steel caisson rig, to be used for oil development in the Arctic Ocean, will measure 111 by 111 meters (364 by 364 feet) in the lower section, 86.6 by 86.6 meters (284 by 284 feet) in the upper section, and 29 meters (95 feet) in height, and have a work- ing water depth of 21 meters (69 feet). The total weight will be about 33,000 tons. To be built at IHI's Aichi Works, the huge caisson rig will be delivered toward the end of IHI To Build World's First Mobile Arctic Caisson Rig For Beaufort Sea An artist's conception of the mobile Arctic caisson rig. uven /,uuu snips are Tinea witn Macuregor LO-LO access. A cover for every opening: side rolling, hydraulic folding, telescopic,single pull,flush sliding, piggyback, direct pull,pontoon Jlilo^PDrPnD and foldtite. lf7aCbllLuC/ll transfer and access equipment MacGregor Comarain Inc.,135 Dermody Street,Cranford.NJ 07016,USA. Telephone:(201)272-8440. Telex: 138618 MACGREGOR N CNFD. October 15, 1981 Write 3432 on Reader Service Card 55
