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JAPANESE MARITIME REVIEW Japan's first jetfoil service, and today it operates a fleet of five diesel ferries and five jetfoils. The company's high-speed, reli- able service has been so effective that in 1996, its only competition — an airline — stopped flying to Sado Island. That year, Sado Kisen vessels carried 650,000 peo- ple, most of them tourists. Sado Kisen's jetfoils, built by Boeing Corp., are powered by avia- tion-type Allison gas turbines. The units create a waterjet system (Continued from previous page) handle the offloading hose. The cargo tank of the FSO is designed by the Leak Before Failure (LBF) concept in conformi- ty with the self-supporting tank type B in IMO Gas Code. In fatigue design of the type B tank, the builder insisted that the actual structural construction tolerance be better than the tolerance assumed in the design. Although the hull structure is not subjected to the type B by IMO Gas Code, it was evaluated in order to ensure reliability equivalent to that of the cargo tank. Principal Particulars Length, o.a 565 ft. (172.1 m) Length, b.p 466.2 ft. (142.1 m) Breadth, molded 118.1 ft. (36 m) Design draft, molded 77 ft. (23.4 m) DWT 37,354 GT 40,681 Cargo tank IHISPB system (3) Accommodation 50 Diesel generator 1,750 kW (4) LPG refrigeration plant, R22 cascade type 1,885 kW (2), 920 kW (2) Reliquification plant, direct type 1,897 cu. m./hr. (3) Cargo pump, deep-well type —530 cu. m./hr, (6) Inert gas generator 3,600 cu. m./hr. Loading capacity 1,075 cu. m./d (normal) 3,180 cu. m./d (maximum) Pictured is the FEM analysis model of hull and tank (top external, bottom internal view). that, according to Boeing, helps to decouple the vessel ^^^ from surface water, providing a smooth ride even in heavy seas. With foils extended, the vessels cruise at approximately 43 knots. The propulsion system operates on a waterjet principle, using pumps to discharge water at high pressures through nozzles ^^^ directed aft. Each vessel has two pumps which deliver 24,000 gallons per minute. Each pump is powered by a gas turbine system. According to Sado Kisen engi- neers, the most critical challenge for a jetfoil engine lubrication sys- Organised by: Seatrade Miller Freeman Japan Co. Ltd Sponsored by: The Shipbuilders' Association of Japan The Japanese Shipowners' Association Japanese Marine Equipment Association Japan Ship Exporters' Association tem comes from accumulated sodi- um chloride crystallized from sea- water, which causes oil-path plug- ging. Analyzing used oil is the best way to monitor such accumula- tions, but detecting seawater in a used oil sample in extreme high temperature atmospheres is diffi- cult. To solve the problem, Mobil To book space or for further information contact \n. Miller Freeman A United News & Media company Seatrade events are owned by Miller Freeman and organised in association with the Seatrade Organisation Christopher Eve Miller Freeman Japan Co. Ltd No. 23, Chuo Building 4-2 Nihonbashi-Kodenmacho Chuo-ku, Tokyo 103, Japan Tel:+81 3 3669 5811 Fax: +81 3 3669 5830 E-mai1: 7165101421 @compuserve.com or The International Sales Agents: Seatrade Seatrade House 42 North Station Road Colchester C011RB, UK. Tel:+44 1206 545121 Fax:+44 1206 545190 E-mai 1:100125.543@compuserve.cotn Announcing The Leading Shipbuilding Nation in the World The Leading Maritime Exhibition in Asia SEA EXHIBITION 98 APAN INTERNATIONAL MARITIME EXHIBITION PACIFICO YOKOHAMA 11-13 March 1998 Third in the series of highly successful Sea Japan exhibitions December, 1997 Circle 267 on Reader Service Card 71