188,500-DWT Tanker For Transport Of Alaskan Oil Christened At National Steel And Shipbuilding

Christening ceremonies were recently performed at National Steel and Shipbuilding Co., San Diego, Calif., aboard the S/S B.T. San Diego, the second of two 188,500-deadweight-ton San Diego-class tankers for long-term use by Shell Oil Company.

Mrs. Chauncey W. Cook, whose husband is a member of the board of directors of Shell Oil Company and the former chairman of the board of General Foods Corporation, sponsored the new tanker.

Mrs. John A. Cole, wife of the senior vice president of Texas Commerce Bank, assisted as matron of honor. Others participating in the ceremonies included Chauncey W. Cook, principal speaker, San Diego Mayor Pete Wilson, C. Larry French, president, National Steel and Shipbuilding Company (NASSCO), and John M. Murphy, vice president, Sales and Public Relations, NASSCO.

The San Diego was launched from NASSCO's building basin on May 6, 1978, and delivered on October 20, 1978. Her sistership, the S/S B.T. Alaska, was launched in July 1977 and delivered in March of this year.

The two ships, the largest ever built on the West Coast, represent the first flight of San Diegoclass tankers to be designed and built by NASSCO. Each tanker has a crude oil cargo capacity of about 188,000 long tons (about 1.3 million barrels) and is chartered to Shell Oil Company of Houston, Texas, for long-term service in the transportation of crude oil from Alaska to mainland United States ports.

The two ships are 951 feet in length, 166 feet in beam, 78 feet molded depth, and have a loaded draft of about 59 feet. Propulsion is by a twin-boiler geared steam turbine plant which is capable of being operated continuously at 28,000 shaft horsepower. Engine speed and direction can be controlled from a console on the bridge.

The ships include the latest environmental features. They have full double bottoms and sufficient clean segregated ballast to comply with U.S. Coast Guard and proposed IMCO "International" Rules for Prevention of Pollution of the Sea by Oil. Current rules of the Environmental Protection Agency for no overboard discharge of sewage are met by full onboard retention in holding tanks. The vessels are also fitted with a collision avoidance radar system.

An inert gas system, designed to fill the void spaces in the cargo tanks, thereby minimizing the possibility of an explosive vapor mixture, has been fitted. The cargo system is designed with a holding tank to collect oil from tank washings for discharging to shore facilities. The bilge system contains apparatus to effectively separate and retain oil from the bilge waters for discharge to shore in accordance with the U.S. Coast Guard requirement.

NASSCO is owned equally by Kaiser Industries Corporation and Morrison-Knudsen Company, Inc.

Other stories from November 15, 1978 issue

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