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Shell Facility (3462), St. Rose

LDEQ Accident Report

Accident #98478
State Police #07-04516
Accident Date2007-06-03
Report Date 2007-08-14
Follow-up Date 0000-00-00
Follow-up: No

Pollutants Released

Pollutant Duration Point Source Greenhouse Gas Criteria Pollutant Ozone forming chemical Amount of Release
Xylene2h 5mTank TK-8552NONONO101.0
Toluene3h 0m5-77 St. Rose FlareNONONO110.0 pounds
Hydrogen Sulfide2h 5mTank TK-8552NONONO101.0 pounds
Ethylbenzene2h 5mTank TK-8552NONOYES1,000.0 pounds
Hexane2h 5mTank TK-8552NONONO5,027.0 pounds
Benzene3h 0m5-77 St. Rose FlareNONOYES18.0 pounds
Sulfur Dioxide3h 0m5-77 St. Rose FlareNOYESNO513.0 pounds
Volatile Organic Compounds (VOCs)3h 0m5-77 St. Rose FlareNONOYES5,686.0 pounds
Particulate Matter3h 36mTank TK-8553NOYESNO5,019.0 pounds
Nitrogen Oxide3h 36mTank TK-8552NOYESYES112.0 pounds
Carbon Monoxide3h 36m5-77 St. Rose FlareNOYESNO5,558.0 pounds

Accident Classified As:

Cause of Problem: Process Upset

During a crude tank switch there was a unit upset when water and emulsion from a feed tank was introduced into the process, leading to the over pressuring of a de-salter vessel to the flare, a spill of water and emulsion to the water treatment facility and the shutdown of the compressor with additional flaring. During this unit upset tanks TK-8552 and TK-8553 roof legs inadvertently landed on the floor

Discharge Preventable - Yes

Notes/Remedial Actions

Initial written report issued 6/20/07 but investigation revealed additional vent streams were routed to the flare so the numbers were updated on 8/14/07. To prevent this the water in the crude oil tank should have been drained prior to being placed in service. The crude tank was switched back to prevent further water and emulsion from being fed into the unit. Necessary steps were taken to clean up the wastewater treatment facility & return unit to normal. Tanks TK-8552 and TK-8553 were refilled to their normal levels. In the future, the water in the crude tank will be drained before the tank is placed into service