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ExxonMobil Chemical Plant (286), Baton Rouge

Releases of Methylcyclopentane

LDEQ Accident Number
Accident Date		 Point Source(s) Notes Amount of Release
113260

2009-03-09		WILA tanks #8 and 9

Cause: The release was caused by the pumping of low flash material into WILA Tanks 8 and 9. The material evolved a greater amount of vapor than the tank's vapor recovery system could manage. The evolution of the vapor caused the pressure in the tanks to exceed that of the pressure vent set point.

Followup: No

Notes: Introduction of low flash point material into these tanks was immediately halted. They could not expect the flash material to evolve too much vapors. Tanks could not handle the vapors and valve lifted. Operators will be trained to communicate better to prevent the overpressure happening again. RQs exceeded for benzene. Total release of hydrocarbons is 600 pounds.		12.0 pounds