Oceanographic Deck Machinery Subject Of Paper Presented At Pacific Northwest Section

Approximately 80 members and guests of the Pacific Northwest Section of The Society of Naval Architects and Marine Engineers attended a regular meeting at Pier 91 Officer's Club, Seattle, Wash.

After the dinner, a technical paper entitled "Oceanographic Deck Machinery" was presented by John M. Trondsen, vice president, T & L Associates Inc., who furnished his audience with an excellent review of current oceanographic deck machinery, describing operational requirements, capabilities, design considerations and maintenance.

The paper contained typical specifications for hydrographic and oceanographic winches and u-frames, a specific comparison of marine deck cranes versus land cranes and a description of the design, purpose and application of fixed sheaves, flag blocks and hanging or gallows blocks. Winch design was also discussed, particularly the electrohydraulic types using high-speed hydraulic motors connected to the drum through gear reducers alternatively low-speed high-torque hydraulic motors direct connected. Considerable emphasis was placed on the art of wire rope spooling, and grooved shells installed on the drum are well advised when more than a few layers of cable have to be spooled. It was pointed out that the area of greatest change in oceanographic winches is in the control and monitoring systems which can now electronically provide for a multiplicity of remotely controlled functions, including brake release, acceleration and deceleration, tension, speed and horsepower limitations, direction sensing, etc.

In conclusion, the author stressed the importance of oceanographic deck machinery being designed for operation on the open main or weather decks.

Due to this exposure and an overlapping responsibility between the deck crew and engine room personnel, particular attention should be paid to deck machinery maintenance.

Discussors were Robert A. Schelling and W.H. Etter.

Copies of the paper can be obtained from the Section librarian.

Maritime Reporter Magazine, page 44, Jan 1978

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