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Halpern. The award is named af- ter the late T. Douglas MacMul- len, West Coast correspondent for Marine Engineering / Log maga- zine, who suggested that the spouse of the Section chairman should be recognized by a special award for her patience and un- derstanding during his tenure. The technical portion of the program consisted of a paper by Mark R. liuetzow of Chevron Shipping Company titled "De- jumboizing of Four 212,000-dwt VLCC's to 150,000 dwt." Between January and October 1980, the tanker D.L. Bower and three sis- ter vessels were shortened by re- moving 101 feet of parallel mid- body from each. Various other modifications were carried out to meet current safety and pollution control regulations as well. The vessels are now in service be- tween Indonesia and the U.S. West Coast. Economic and engineering con- siderations that led to the con- versions as an alternative to pur- chase of new vessels were de- scribed in the paper. The paper also gave characteristics of the vessels before and after conver- sion, and details of how the con- version was accomplished. The presentation was illustrated with slides showing the shortening process, and was followed by an extensive discussion. Seaport Asks Title XI On Two Derrick Barges To Cost $7.5 Million Total Seaport, Inc., New Orleans, has applied to the Maritime Adminis- tration for a Title XI guarantee to aid in financing the construc- tion of two 250-foot derrick barges to be operated in New Orleans Harbor. The applicant is a subsidiary of Southern Harbor & Towing, Inc., Metairie, La. The barges are being built by Bergeron Industries, Braithwaite, La., and Todd Shipyards, Galves- ton, Texas, with deliveries sched- uled during the first and second quarters of 1981. The requested guarantee is for $6,562,000, which is 87% percent of the $7,500,000 estimated cost of both vessels. Mobil Orders Sperry Advanced Navigation System For The 'Mobile Search' Mobil Exploration and Produc- ing Services, Inc., a unit of the Exploration and Producing Divi- sion of Mobil Oil Corporation, has awarded the Sperry Division, Great Neck, N.Y., of Sperry Cor- poration contracts to develop and produce one of the most advanced navigation systems ever devel- oped for a commercial ship. The navigation system will be used aboard Mobil's second Seis- mic Research Vessel, the Mobile Search, whose keel is expected to be laid in mid-1981 by Mitsubishi Heavy Industries Ltd. of Japan. The Sperry navigation system May 15, 1981 will allow Mobil to conduct world- wide seismic oil exploration with high positioning accuracy. In- cluded in the equipment being provided by Sperry are: two Sperry MK 29 Mod 1 high accu- racy gyrocompasses, a newly de- veloped Sperry Parametric Array Doppler Sonar (PADS) system, two Sperry SRD 301 speed logs, two specially modified Sperry CAS II collision avoidance systems, a dual Sperry Universal Gyropilot and both X- and S-band models of the Sperry MK 4016 SEA- THRU radars. In addition, Sperry will provide the computer equipment, Loran C and satellite navigation receivers and the navigation system dis- plays and controls. The entire system will be integrated utiliz- ing all available navigation in- puts and appropriate sensor in- formation to produce the best possible estimate of ship position and velocity at all times. Ad- vanced signal processing pro- grammed on a powerful 32-bit minicomputer will enable the Sperry navigation system to ex- ceed the accuracy limitations in deep water of previous commer- cial navigation systems. The sys- tem is easily expandable to in- clude inputs from a bottom acous- tic transponder system and, when available, the Navstar Global Po- sitioning System. Inert Gas Systems • Equipment Supply • Survey and Drawings • Pipework and Cabling • Installation Supervision • Commissioning PEABODY HOLMES COVER THE WORLD USA EUROPE ATCO Marine Corporation, Peabody Holmes Ltd, 603 Dean St, BROOKLYN NY 11238 Tel: (212) 857-1050 Telex: 223357 17-27 Garratt Lane, LONDON SW18 4BY Tel: 01 -874 6491 Telex: 928632 JAPAN Kashiwa Co Ltd 2-1,1-chome, Marunouchi, CH1Y0DA-KU, TOKYO Tel: 281 3951-4 Telex: 222484 Peabody Holmes Write 118 on Reader Service Card Write 497 on Reader Service Card 13
