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Shell Facility (3462), St. Rose

Releases in 2007

LDEQ Accident Number
Accident Date
Point Source/Release CauseNotes
99717

2007-09-24
Point Source(s):
5-77 (St. Rose Flare)

Pollutant(s):
Benzene - 10 pounds
Carbon Monoxide - 5,128 pounds
Ethylbenzene - 1,000 pounds
Hexane - 5,001 pounds
Nitrogen Oxide - 34 pounds
Particulate Matter - 5,004 pounds
Sulfur Dioxide - 502 pounds
Toluene - 101 pounds
Volatile Organic Compounds - 5,077 pounds
Xylene - 101 pounds
Cause of Problem: Power Failure

Power failure allowed two pressure relief valves to open to the flare to prevent over-pressuring of the unit
The power failure was unexpected. They secured the process unit until the power was restored. Electrical support will work with the energy supplier to understand what caused the failure and take appropriate corrective action to prevent reoccurence. Word for word what happened the prior month
98868

2007-08-23
Point Source(s):

EPN 5-77 St. Rose Flare

Pollutant(s):
Xylene - 101
Toluene - 1 pounds
Hexane - 2 pounds
Xylene - 2 pounds
Ethylbenzene - 0 pounds
Benzene - 1 pounds
Volatile Organic Compounds (VOCs) - 78 pounds
Particulate Matter - 4 pounds
Sulfur Dioxide - 8 pounds
Nitrogen Oxide - 21 pounds
Carbon Monoxide - 12 pounds
Cause of Problem: Power Failure

Power failure allowed two pressure relief valves to open to the flare to prevent over-pressuring of the unit
The power failure was unexpected. They secured the process unit until the power was restored. Electrical support will work with the energy supplier to understand what caused the failure and take appropriate corrective action to prevent it from reoccurring.
98478

2007-06-03
Point Source(s):
5-77 St. Rose Flare
Tank TK-8552
Tank TK-8553

Pollutant(s):
Xylene - 101
Toluene - 110 pounds
Hydrogen Sulfide - 101 pounds
Ethylbenzene - 1,000 pounds
Hexane - 5,027 pounds
Benzene - 18 pounds
Sulfur Dioxide - 513 pounds
Volatile Organic Compounds - 5,686 pounds
Particulate Matter - 5,019 pounds
Nitrogen Oxide - 112 pounds
Carbon Monoxide - 5,558 pounds
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
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