Paper On Real Time Monitoring Presented At Pacific Northwest SNAME

At the spring meeting in Vic- toria, British Columbia, Canada, the Pacific Northwest Section of The Society of Naval Architects 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 & Associates, Inc., was followed by "Selection and Design of Hydraulic Systems Including Arctic Operation," by Karl H. Strauss of Western Hydrostatic System Ltd.

The Real Time Motion Paper was brought about by the shipment by barge of a 240-ton failed steam generating unit from the Surry, Va., nuclear power plant in the spring of 1980, which provided an opportunity to apply modern state-of-the-art motion monitoring and damage avoidance techniques to a towed ocean barge. This paper reports on: (1) The project background, including pre-voyage risk analysis which resulted in the recommendation that real time motion monitoring be provided; (2) The design and installation of the motion 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 predictions based on log book and hindcast sea state data.

It was concluded that the real time motion monitoring worked well on the subject barge shipment, and achieved the primary objective of providing useful feedback to the tug master concerning the effects of his actions on the barge and cargo. It was suggested that the technique is sufficiently promising to warrant wider use by the offshore tug/ barge industry.

The Selection and Design paper was broken into five parts: hydraulics and the arctic environment; key features and capabilities; hydraulic system structure; components—selection and recommendations; and fluids, materials causes and effects. The first four sections of this paper provide a practical guide to the different hydraulic system types, their capabilities and applications.

The last section deals more with the theory and principles involved, upon which some of the recommendations made are based.

The material covered is primarily based on hydrostatic systems for northern climates; however, the principles covered apply to most systems in all environments.

Maritime Reporter Magazine, page 12,  Jul 1981

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