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Safety Recommendation Details

Safety Recommendation M-74-040
Details
Synopsis: ON FEBRUARY 1, 1972, THE TANKSHIP V.A. FOGG DEPARTED FREEPORT, TEXAS, EN ROUTE TO THE GULF OF MEXICO TO CLEAN CARGO TANKS THAT CARRIED BENZENE RESIDUE. THE VESSEL WAS DUE TO ARRIVE IN GALVESTON, TEXAS, ON FEBRUARY 2. AT APPROXIMATELY 1545 FEBRUARY 1, THE V.A. FOGG SUFFERED MULTIPLE EXPLOSIONS AND SANK. ALL 39 PERSONS ABOARD DIED AS A RESULT OF THIS CASUALTY.
Recommendation: UTILIZE SYSTEMS SAFETY TECHNIQUES TO: EVALUATE PROPOSED METHODS OF TANK CLEANING OPERATIONS BEFORE APPROVING CARGO-TANK INTERNAL DESIGN FEATURES OF TANKSHIPS.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Reconsidered
Mode: Marine
Location: Gulf of Mexico, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: 80125
Accident Reports: ​SS V.A. FOGG, Gulf of Mexico, February 1, 1972. (issued jointly with USCG)
Report #: MAR-74-08
Accident Date: 2/1/1972
Issue Date: 9/13/1974
Date Closed: 6/30/1981
Addressee(s) and Addressee Status: USCG (Closed - Reconsidered)
Keyword(s): Hazmat

Safety Recommendation History
From: NTSB
To: USCG
Date: 6/30/1981
Response:

From: USCG
To: NTSB
Date: 2/11/1981
Response: U.S. COAST GUARD LTR: TWO POSSIBLE SAFETY BENEFITS WERE DETERMINED FROM THE COAST GUARD'S REVIEW OF THE POSSIBILITY OF ENHANCING THE SAFETY OF TANK CLEANING OPERATIONS BY OPTIMIZING TANK INTERNAL DESIGN: (A) MINIMIZATION OF THE DURATION OF TANK CLEANING WITH A REDUCTION IN THE LENGTH OF TIME A CARGO TANK WOULD BE VULNERABLE, AND (B) REDUCTION IN THE MAGNITUDE OF ELECTROSTATIC POTENTIALS DEVELOPED DURING TANK CLEANING. TANK WASHING STUDIES CARRIED OUT IN RELATION IN IMPLEMENTING ANNEX II OF THE 1973 MARINE POLLUTION CONVENTION HAVE SHOWN THAT THE INTERNAL DESIGN OF A TANK ONLY MINIMALLY AFFECTS THE EASE WITH WHICH A TANK CAN BE CLEANED. OPTIMIZING THE EFFICIENCY OF THE TANK CLEANING PROCESS HAS RECEIVED CONSIDERABLE ATTENTION WITHIN THE 1973 MARINE POLLUTION CONVENTION. IT SHOULD BE NOTED IN 33 CFR 157.34 THAT EACH CARGO TANK MUST BE DESIGNED FOR LONGITUDINAL AND TRANSVERSE DRAINING DURING CRUDE OIL WASHING OPERATIONS. STUDIES ON ELECTROSTATICS HAVE ALSO SHOWN THAT THE LOCATION OF INTERNAL FRAMING ALSO ONLY MINIMALLY AFFECTS THE STRENGTH OF ELECTROSTATIC POTENTIALS. THE SIGNIFICANCE OF OPTIMIZING THE INTERNAL DESIGNS WILL BE FURTHER REDUCED BY THE INSTALLATION OF INERT GAS SYSTEMS. DUE TO THE MINIMAL SAFETY BENEFITS GAINED BY OPTIMIZING TANK DESIGNS AND DUE TO THE FITTING OF INERT GAS SYSTEMS ON MANY TANK VESSELS, THE COAST GUARD BELIEVES THAT NO FURTHER WORK ON THIS RECOMMENDATION IS WARRANTED.

From: USCG
To: NTSB
Date: 2/25/1976
Response: USCG LTR: THE DESIGN OF CARGO TANK INTERNALS FOR ACID AND CAUSTIC CARRIERS PRESENTLY TAKES INTO ACCOUNT TANK CLEANING REQUIREMENTS. SIMILAR DESIGNS COULD BE APPLIED TO CARGO TANKS CARRYING INFLAMMABLE AND COMBUSTIBLE LIQUIDS. THIS AREA WILL BE GIVEN EVALUATION.