SNAME Pacific Northwest Section Holds Joint Meeting With ASNE
Members and guests of the Pacific Northwest Section of The Society of Naval Architects and Marine Engineers met on June 2 at the Puget Sound Naval Shipyard Officer's Club in a joint session with the Puget Sound Section of the American Society of Naval Engineers. Election results were announced and a technical paper was presented.
Opening remarks were offered by SNAME chairman Doug Hendrix and ASNE chairman Capt.
Lawrence Taylor Jr. Both societies were welcomed in remarks by Capt. James K. Nunneley, Shipyard Commander.
SNAME officers for 1978 include Gerald Talbot of Talbot, Jackson and Associates of Vancouver, British Columbia, as chairman of the Pacific Northwest Section; Edward Stewart of Todd Shipyards as secretary-treasurer, and Gene Frampton of the U.S. Coast Guard as executive board member. Paul Zankich was elected as vice chairman for the Seattle, Wash., area. In the British Columbia area, Elijah Horner of Vancouver Shipyards was elected as vice chairman, and Robert M. Brown, Burrard Iron Works, was elected as assistant treasurer. In the Columbia River area, Tony Zager, U.S. Army Corps of Engineers, was elected vice chairman, and John D. Horner of the U.S. Coast Guard was elected assistant secretary-treasurer.
The technical paper, titled "Bimetal Aircraft Securing Fitting Development," was presented by Charles B. Dick, PE, of Puget Sound Naval Shipyard Design Code 230.3. In his paper, Mr. Dick discussed the development, testing and ultimate selection for prototype evaluation of a bimetal collar securing fitting. The fitting consists of an explosively bonded aluminum/steel collar with the steel welded to a Navy Standard securing fitting and the aluminum welded to the ship's aluminum deck.
Mr. Dick explained that many of the helicopter decks on destroyers are 5000 series aluminum.
The present method of attaching steel aircraft securing fittings to aluminum decks is by welding a stainless steel collar to a type 1 securing fitting cup and crossbar and bolting the assembly to the deck. Severe corrosion conditions due to exfoliation and galvanic action have resulted in costly repairs. On-site inspection of the Atlantic-based FF1052- class ship selected for prototype installation and evaluation demonstrated damage in some cases reaching beyond a 14-inch diameter and up to 25 percent of the deck plate thickness.
Bimetal fittings were manufactured at Puget Sound Naval Shipyard for installation by a private contractor using conventional aluminum welding techniques in January 1977. The fittings were preserved in a fashion which permit observation and comparison of corrosion patterns under various conditions expected during the evaluation period while the ship was experiencing normal helicopter "traffic." Copies of the paper are available from the section librarian, C.S. Bracken, Todd Shipyards Corporation, P.O. Box 3806, Seattle, Wash. 98124.