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and Marine Engineers heard two papers. "Experience with Real Time Motion Monitoring on the Barge Foss 245," presented by Robert E. Nichol of Diehl & Lundgaard, Inc. and Bruce L. Hutchison of L.R. Glosten & As- sociates, Inc., was followed by "Selection and Design of Hydrau- lic Systems Including Arctic Op- eration," by Karl H. Strauss of Western Hydrostatic System Ltd. The Real Time Motion Paper was brought about by the ship- ment by barge of a 240-ton failed steam generating unit from the Surry, Va., nuclear power plant in the spring of 1980, which pro- vided an opportunity to apply modern state-of-the-art motion monitoring and damage avoid- ance techniques to a towed ocean barge. This paper reports on: (1) The project background, in- cluding pre-voyage risk analysis which resulted in the recommen- dation that real time motion mon- itoring be provided; (2) The de- sign and installation of the mo- tion monitoring system; and (3) The tug master's experience during the voyage with the real time motion feedback. The paper concludes by comparing selected motion records from the motion monitoring system to motion pre- dictions based on log book and hindcast sea state data. It was concluded that the real time motion monitoring worked well on the subject barge ship- ment, and achieved the primary objective of providing useful feed- back to the tug master concern- ing the effects of his actions on the barge and cargo. It was sug- gested that the technique is suf- ficiently promising to warrant wider use by the offshore tug/ barge industry. The Selection and Design pa- per was broken into five parts: hydraulics and the arctic envi- ronment; key features and capa- bilities; hydraulic system struc- ture; components—selection and recommendations; and fluids, ma- terials causes and effects. The first four sections of this paper provide a practical guide to the different hydraulic system types, their capabilities and applica- tions. The last section deals more with the theory and principles in- volved, upon which some of the recommendations made are based. The material covered is pri- marily based on hydrostatic sys- tems for northern climates; how- ever, the principles covered apply to most systems in all environ- ments. Dravo Acquires The Ryan-Walsh Group Dravo Corporation, Pittsburgh, Pa., announced it has acquired the Ryan-Walsh group of com- panies following approval by shareholders of the Mobile-based cargo-handling organization. The acquisition was made on the ba- sis of 18.825 Dravo common shares for each of the 21,911 shares of Ryan-Walsh common stock issued and outstanding. Ryan-Walsh is one of the larg- est cargo handlers on the Gulf and South Atlantic Coasts. The firm operates bulk terminals or other facilities at New Orleans, Mobile, and 10 other Southern ports, handling both bulk com- modities and general cargoes. Through several subsidiaries, Ryan-Walsh also is engaged in container leasing and repair, crating, and steamship agency and barge fleeting services. Ryan- Walsh had revenue of about $65 million in 1980. Robert Dickey III, Dravo chair- man and president, said that "the increasing volume of grain and coal exports being routed through Gulf Coast ports should provide attractive growth opportunities for Ryan-Walsh, as should the anticipated completion of the Ten- nessee Tombigbee Waterway, which will dramatically increase activity at the Port of Mobile." Mr. Dickey noted the expected operating synergies between Ryan-Walsh and several existing Dravo activities including barge transportation, design and erec- tion of bulk terminal facilities and fabrication of bulk materials handling equipment. Inert Gas Systems • Equipment Supply • Survey and Drawings • Pipework and Cabling • Installation Supervision • Commissioning PEABODY HOLMES COVER THE WORLD USA ATCO Marine Corporation, 603 Dean St, BROOKLYN NY 11238 Tel: (212) 857-1050 Telex: 223357 EUROPE Peabody Holmes Ltd, 17-27 Garratt Lane, LONDON SW18 4BY Tel: 01-874 6491 Telex: 928632 JAPAN Kashiwa Co Ltd 2-1,1-chome, Marunouchi, CH1YODA-KU, TOKYO Tel: 281 3951-4 Telex: 222484 Peabody Holmes July 1, 1981 Write 503 on Reader Service Card 13 R 481 13
