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ExxonMobil Chemical Plant (286), Baton Rouge

Releases of Natural Gas

LDEQ Accident Number
Accident Date
Point Source(s) Notes Amount of Release
92930

2006-12-28
#4 Mox Boiler
Cause: Their #4 Mox boiler has a mechanically operated valve that opens at high pressure. High pressure in the line caused it to open, but they do not know what caused the high pressure yet.

Followup:

Notes: It was determined that Ethane, Methane, and Propylene were the chemicals involved in the fire. They believe they exceeded the RQ for VOC's.
19,000.0 pounds
110123

2008-10-15
Natural Gas blankets on tanks
Storage tanks
Cause:

Followup: No

Notes: Seepage of natural gas blanket from storage tanks occurring on 10/15/08. They were emitting it at a rate of 1005 lbs/day. Maintenance was planned for the next week. Report says no RQ exceedences.
110123

2008-10-15
Natural Gas blankets on tanks
Storage tanks
Cause:

Followup: No

Notes: Seepage of natural gas blanket from storage tanks occurring on 10/15/08. They were emitting it at a rate of 1005 lbs/day. Maintenance was planned for the next week. Report says no RQ exceedences.
109573

2008-09-25
Tanks #957, 991, 791, 792
Cause: Leaking emergency hatch on tank #791, 792, 957, 991.

Followup: No

Notes: Leaking emergency hatch on tanks 791, 792, 957, and 991. Leak rate was approximately 100 PPH per tank. They were trying to get them fixed. A copy of the written report dated 3/17/09 was faxed to LDEQ. Report said no RQs were exceeded during this release.
124978

2010-07-20
Tank 916
Cause: On 7/20/10 at approximately 10 am the LDEQ responded via phone to Exxon Mobil concerning a natural gas leak. The gas leak developed on top of Tank 916 at the Oxo Plant.

Followup: No

Notes: Operators quickly shut down the tank. Air monitoring was conducted. An unknown quantity of natural gas was released. Pictures included in report of Tank and how it was patched up where the leak occurred. Tank appears covered in rust.
132132

2011-06-29
Safety valve
Cause: Methane release occurred when a safety valve reached it's pressure setting. Released to atmosphere.

Followup: No

Notes: Due to prompt incident response to mitigate the event duration, no reportable quantities were exceeded.
79.0 pounds