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Shell Facility (3462), St. Rose
LDEQ Accident Report
| Accident # | 98478 |
| State Police # | 07-04516 |
| Accident Date | 2007-06-03 |
| 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 |
| Xylene | 2h 5m | Tank TK-8552 | NO | NO | NO | 101.0 |
| Toluene | 3h 0m | 5-77 St. Rose Flare | NO | NO | NO | 110.0 pounds |
| Hydrogen Sulfide | 2h 5m | Tank TK-8552 | NO | NO | NO | 101.0 pounds |
| Ethylbenzene | 2h 5m | Tank TK-8552 | NO | NO | YES | 1,000.0 pounds |
| Hexane | 2h 5m | Tank TK-8552 | NO | NO | NO | 5,027.0 pounds |
| Benzene | 3h 0m | 5-77 St. Rose Flare | NO | NO | YES | 18.0 pounds |
| Sulfur Dioxide | 3h 0m | 5-77 St. Rose Flare | NO | YES | NO | 513.0 pounds |
| Volatile Organic Compounds (VOCs) | 3h 0m | 5-77 St. Rose Flare | NO | NO | YES | 5,686.0 pounds |
| Particulate Matter | 3h 36m | Tank TK-8553 | NO | YES | NO | 5,019.0 pounds |
| Nitrogen Oxide | 3h 36m | Tank TK-8552 | NO | YES | YES | 112.0 pounds |
| Carbon Monoxide | 3h 36m | 5-77 St. Rose Flare | NO | YES | NO | 5,558.0 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
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