Page 42: of Maritime Reporter Magazine (August 15, 1969)

NKK Uses Computers For Preliminary Design Of Four Supertankers To meet the increasing tide of worldwide demand for large tank-ers and offset costs of operating giant ships, a computer-designed, 250,000-dwt tanker with high econ-omy performance levels has been developed by Nippon Kokan, Ja-pan's only integrated shipbuilder-steelmaker. Hiroo Ikematsu, NKK's New York naval architect, said the new design will be applied to four tank-ers slated for construction at the company's $42-million Tsu Yard in central Japan. Two of the four ves-sels are 250,000 deadweight tonners for Canadian Pacific (Bermuda); the others are 256,000-dwt ships for Anders Jahre A/S of Norway. NKK reports the new standard design vessel is one of the most economical supertankers in exis-tence. It incorporates such compu-ter-designed features as: optimum size and arrangement of tanks which can be loaded and unloaded at two ports with two types of crude oil; a piping system to re-duce loading and unloading time; high efficiency vessel performance when empty and loaded, and in-creased maneuverability to compen-sate for vessel size. The NKK tanker requires a crew of 45 to 50; is about 1,109 feet 3 inches long overall; has a molded breadth of about 169 feet 11 inches; depth molded to the upper deck amidship of about 87 feet 7 inches; maximum draft, extreme of about 68 feet 7 inches. Gross tonnage is about 128,000; deadweight tonnage?about 256,-000. The steam turbine engine will have a service output of 31,000 shp and vessel cruising speed is about 15.6 knots. Mr. Ikematsu said that when the diesel engine selection is made, all main particulars will be subject to minor changes. The company's fully-integrated computer system for ship designing was used in the model experiment, performance testing, and initial de-sign phases of the new supertank-er's development. In the initial planning phase, general specifications identified by NKK engineers and particular re-quirements of Canadian Pacific and Anders Jahre were applied to the characteristics of a standard-type tanker which had been previously fed into the Shipbuilding Division computer, an IBM 360/75. Calcula-tions were then begun of various data for the new design including draft, trim, dimensions, stability, displacement, deadweight, and lon-gitudinal strength factors such as bending moment and shearing force. Following this procedure, initial drawings were automatically pre-pared by Numericon and Panac units, computer controlled equip-ment made by Muto Kogyo Co. Ltd. and Essi Kinzmatic of Japan. Each design included slight altera-tions of configuration. The system enabled NKK to evaluate multiple initial designs each accompanied by detailed computer-prepared explan-ations. statistics, and recommenda-tions for optimum design. After the new type tanker initial design was selected, complete plans were drafted by each section of NKK's basic ship design depart-ment. Alden Electronic Issues Publication Describing Graphic Recording Alden Electronic & Impulse Re-cording Equipment Company, Inc., Washington Street, Westboro, Mass., has announced the availa-bility of their recent 16-page pub-lication entitled "Instant Graphic Recording News." The publication-is available free on a first come first serve basis until the supply is exhausted. 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