Page 42: of Maritime Reporter Magazine (January 1978)

Oceanographic Deck Machinery

Subject Of Paper Presented

At Pacific Northwest Section

Shown at the Officer's Club in Seattle, left to right:

Paul Zankich, vice chairman, Puget Sound Area, Pa- cific Northwest Section; John M. Trondsen, vice pres- ident, T & L Associates Inc., author; Gerald Talbot, chairman, P.N.W. Section, and William Dahlbeck, Pa- pers Committee chairman, P.N.W. Section.

Approximately 80 members and guests of the Pacific Northwest Section of The Soci- ety of Naval Architects and Marine Engi- neers attended a regular meeting at Pier 91

Officer's Club, Seattle, Wash.

After the dinner, a technical paper entitled "Oceanographic Deck Machinery" was pre- sented by John M. Trondsen, vice president,

T & L Associates Inc., who furnished his au- dience 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 ma- rine deck cranes versus land cranes and a description of the design, purpose and ap- plication of fixed sheaves, flag blocks and hanging or gallows blocks. Winch design was also discussed, particularly the electro- hydraulic types using high-speed hydraulic motors connected to the drum through gear reducers alternatively low-speed high-torque hydraulic motors direct connected. Consid- erable emphasis was placed on the art of wire rope spooling, and grooved shells in- stalled 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 multi- plicity of remotely controlled functions, in- cluding brake release, acceleration and de- celeration, tension, speed and horsepower limitations, direction sensing, etc.

In conclusion, the author stressed the im- portance 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 mainte- nance.

Discussors were Robert A. Schelling and

W.H. Etter.

Copies of the paper can be obtained from the Section librarian. 1176' BIG BERTHA

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AA/D -A STROA/G POSS/&/L/7-V

OP RA/A/. MY CO/?// HURT'S. " 44 Maritime Reporter/Engineering News