Page 64: of Maritime Reporter Magazine (May 15, 1969)

GQ 4 TOWING-CHARTER TUGS STEEL SCOWS 39 BROADWAY, NEW YORK, N.Y. 10006 (212) WHiteMI 3-5534 RADIATOR SPECIALTY CO. CHARLOTTE, N. C. 28201 NKK Uses World's First Shipboard Computer System For Strength Calculations Highly successful 100-day test operation of Cargo Comp, reportedly the world's first ship-board computer system for performing various calculations of vessel strength, has been an-nounced by Nippon Kokan, Japan's only inte-grated shipbuilder-steelmaker. Hiroo Ikematsu, the company's New York naval architect, said the system, developed jointly by NKK and Oki Electric Industry Co., Ltd. of Tokyo, performed all assigned func-tions during the 100-day voyage of the 97.580-dwt ore/oil carrier, Kohfukusan Maru, which began in October 1968. Manufacture and sale of the system are being conducted by Oki Electric. Cargo Comp employs a digital computer for calculating various factors such as hull longi-tudinal strength, trim, stability, draft, displace-ment and deadweight to enable optimum load-ing and maintain vessel trim under varying sea conditions. The test unit was ordered by Mitsui O.S.K. Lines, owner of the ore/oil carrier which was delivered in June, 1968. Mr. Ikematsu said the system's versatility and simplicity eliminates the need for opera-tion by specially trained personnel. All system handling during the 100-day test was controlled by second and third mates. During the voyage, the total of 3,367 calculations completed re-quired only 2,015 minutes, or slightly over 30 seconds per calculation. Most important of the many calculations were those for hull longitudinal strength. This involved determination of bending moment and shearing force at 14 transverse bulkhead points. Various conditions were programmed into the calculations including sagging and hog-ging both at sea and in sheltered waters. L. Smit's Salvage Subsidiary Increasing Fleet Capability The fleet of W. A. van den Tak's Salvage Co. Ltd., a subsidiary of L. Smit's Interna-tional Tug Service of Rotterdam, Holland, is being increased by two oceangoing salvage vessels and a crane vessel. These units have been recently ordered in Holland. The 2,300-gt diesel-electric, self-propelled, seagoing crane vessel features a sheerleg type crane with a lifting capacity of 800/1200 tons. The owners say that this unit will be the biggest of its type in the world. Four tackles (two of 250 tons and two of 150 tons) will give the vessel a lifting capacity of 800 tons with a spread of 33 feet. It will be further equipped with four deck tackles with a com-bined lifting capacity of 600 tons. The new unit is designed in such a way that, except for the lifting of sunken vessels, it will be suitable to remove wrecks, quay walls, dams, moles, etc. For removing obstacles from a channel, the unit is fitted with a dual wreck gripper. Both shackling wires of the gripper will be connected to the 250-ton tackles, so that apart from the gripper's own weight of 100 tons, an additional effective 400-ton pull can be achieved. The gripper consists of two grippers which are independent of each other, but can be operated simultaneously. The crane vessel, which is being built by Rotterdam Drydock Company, has a length of 197 feet, a breadth of 78 feet and a depth of 17 feet. It will be propelled by twin variable-pitch propellers. A bow thruster is also in-stalled for maneuvering. Following delivery in December of this year, it will proceed to Liverpool for removing wrecks in the Mersey River. The salvage vessels consist of two units. One is 148 feet long and is propelled by two 740-hp diesel engines driving variable-pitch pro-pellers. It will be equipped with 10-ton, 30-ton and 100-ton derricks and all the necessary equipment for complete salvage operations. The other salvage vessel is smaller, having a length of 93 feet but similarly equipped as the larger vessel. Van den Tak also has acquired a Mark IV diving system, designed by the Ocean Engi-neering Division of Reading & Bates Offshore Drilling Company, for salvage and bottom sur-vey work. It was also announced that the van den Tak organization has acquired the worldwide license rights for the use of the polystyrene spheres salvage method developed by Karl Kroyer of Denmark. Big River To Build Two Oil-Well Supply Boats Tidewater Marine Service, Inc., New Or-leans, La., has contracted Big River Shipbuild-ing, Inc., Vicksburg, Miss., to build two off-shore, oil-well supply boats. Each vessel will have dimensions of 165 feet by 38 feet by 13 feet and will be equipped with 1,700-total-bhp diesels. Brent Ship Building Triple-Screw Towboat Logan Charter Service, Inc., of Greenville, Miss., has awarded a contract to Brent Ship-yard, Greenville, Miss., for the construction of a triple-screw towboat. To be named Hilman Logan, this boat will be powered with 4,800-total-bhp General Motors diesels and will have the following dimensions: 140 feet in length, 45 feet in beam and 11 feet in depth. for faster turn around TURN TO BREWER ? Marine Repairs and Construction ? 5 Sectional Drydocks up to 8500 tons ? Deepwater Vessels or Harborcraft ? Pierside work-24 hr. service DRY DOCK COMPANY MARINERS HARBOR, STATEN ISLAND 3, N.Y. YUkon 1-3500 ESTABLISHED 1899 SPECIALISTS IN DECK CHAIRS Joiner Work Shipboard Furniture Manufacturing and Repairing Most complete line of aluminum and wooden deck chairs for the maritime industry. Supplying the steamship trade for over 45 years REX CABINET AND LINOLEUM 531-23rd Street, Union City, N. J. 07087 212 LOngacre 4-2945 ? 201 UNion 5-5146 68 Maritime Reporter/Engineering News