Page 53: of Maritime Reporter Magazine (April 1984)

early 1970s, the U.S. Navy imple- mented a program for underwater cleaning of Navy ships. New methods were developed for clean- ing, inspection, and performance rating. More than 40 ships in- volved in multiple cleanings were included in the program over a six-year period. Interactions of hull cleaning with paint performance were studied. Performance factors that evolved included chemical re- actions of the copper-based anti- fouling paints, blistering of the anticorrosion paints, brushing in- tensity during cleaning, and cath- odic protection systems. Underwa- ter cleaning was established as a viable option for extending the service life of antifouling coatings. 11:00 a.m. "Organotin Antifouling Paints and the Environment—Drydock

Phase," by Carl M. Adema and

Paul Schatzberg.

Fuel savings of several hundred million dollars annually are ex- pected from a pending Navy deci- sion to use antifouling hull paints based on tributyltin compounds.

Several Navy and commercial ship trials have demonstrated that these paints routinely outperform the current military specification paints based on cuprous oxide. Additional savings are expected as a result of less frequent drydocking and the elimination of underwater hull cleaning.

However, because the organotin compounds are more toxic than cu- prous oxide, the potential effect on the environment must be consid- ered. Organotin discharge regula- tions and current drydock prac- tices are reviewed, and the quantity of organotin generated during dry- dock operations is estimated. An environmental assessment of the

Fleet-wide use of organotin anti- fouling paint is being prepared un- der contract.

Palladian Room—Session 4A

Hull Design

Moderator:

Capt. Roger M. Nutting, USN

Edward N. Comstock, assistant 2:30 p.m. " 'No Frame' Concept—Its Im- pact On Shipyard Cost," by Na- tale S. Nappi, Ronald W. Walz, and Christopher J. Wiernicki.

A proposed cost-effective alter- native to current U.S. Navy ship design and production practices is presented in this paper. This pro- posed design for producibility con- cept involves the elimination of structural stanchions and trans- verse web frames. The potential impact of this "no frame" concept on structural design, weight, and construction material costs for frigates and destroyers is reflected in 1) reduced costs for installation of distributive systems, 2) a re- duced number and complexity of structural details providing a more reliable and less costly structure,

March 15, 1984 3) reduced total ship depth, and 4) reduced primary hull girder stresses. 3:15 p.m. "Advanced Technology In Ship

Design Analysis and Production," by M.N. Parker, A.Y. Odabasi,

P.A. Fitzsimmons, and C.J.

Goggin.

Within the past 10 years, ship design, shipbuilding, and ship op- eration have witnessed the emer- gence of new micro-computer tech- nologies that have had a dramatic impact on the way ships are de- signed, built, and operated. This paper presents the development of the BRITDES computer-aided de- sign and detailing system and its utilization of microcomputers in ship design, analysis, and production. 4:00 p.m. "An Advanced Methodology for

Preliminary Hull Form Develop- ment," by Wen-Chin Lin, Wil- liam G. Day Jr., Jeffrey J.

Hough, Robert G. Keane Jr.,

David Walden, and In-Young

Koh.

An advanced methodology is presented for developing hull forms that attain improved performance in both seakeeping and resistance.

Contrary to traditional practice, (continued on page 58)

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