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Occupational Safety and Health Administration OSHA

Accident Report Detail

Accident: 14555072 - Jet Fuel Tanks In Testing Device Exploded

Accident: 14555072 -- Report ID: 0931800 -- Event Date: 04/13/1984
InspectionOpen DateSICEstablishment Name
181115704/13/19843720Lockheed California Company
THE THREE EMPLOYEES WERE PREPARING A UNIT TESTING DEVICE CONSISTING OF FUEL COMPARTMENTS WITH INTERNAL FUEL PIPING AND SWITCHING DEVICES. THE COMPARTMENTS CONTAINED RESIDUAL JP-4 JET FUEL, WITH AN LEL OF .8% BY VOLUME AND A FLASH POINT OF -4% F. WRITTEN SOP INSTRUCTIONS PRESCRIBED CLEANING AND VENTING TO REDUCE THE VAPORS TO LESS THAN 10% OF THE LEL. GAS FREEING WAS TO BE DONE AFTER ALL ELECTRICAL POWER AND ALL OTHER SOURCES OF IGNITION WERE REMOVED FROM THE UNIT AND SURROUNDING AREA. NO SYNTHETIC CLOTHING MATERIALS WAS TO BE ALLOWED IN THE WORK AREA. ALSO, CHECK LISTS WERE TO BE COMPLETED FOR ALL THE ABOVE, PLUS TESTING WAS TO BE ACCOMPLISHED WITH A COMBUSTIBLE GAS INDICATOR. WORK WAS PERMITTED TO PROCEED WITHOUT GAS FREEING AND TESTING, AND WITHOUT A POSITIVE DETERMINATION THAT ALL ELECTRICAL CIRCUITS WERE DEENERGIZED AND THAT WORKERS WERE NOT WEARING SYNTHETIC TYPE CLOTHING. THE RELATIVE HUMIDITY WAS 23% AT 80 DEGREES FARENHEIT. A SPARK, MOST LIKELY FROM AN ELECTRICAL CIRCUIT (28 VOLTS) TO A PRESSURE SWITCH, PROBABLY IGNITED THE VAPORS. CAUSE OF ACCIDENT: SOP WAS NOT FOLLOWED OR ENFORCED.
Keywords: electric arc, flammable vapors, venting, cleaning, explosion, jet fuel, tank
Employee # Inspection Age Sex Degree Nature Occupation
1 1811157 Hospitalized injury Burn/Scald(Heat) Occupation not reported
2 1811157 Hospitalized injury Burn/Scald(Heat) Occupation not reported
3 1811157 Hospitalized injury Burn/Scald(Heat) Occupation not reported

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