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Louisiana Refinery Accident Database

ExxonMobil Refinery (2638), Baton Rouge

LDEQ Accident Report

Pollutants Released

Accident Classified As: Reportable Quantity

Cause of Problem: Human Factors

On February 24th, 2011, at approximately 8:23 am, there was a Tail Gas Incineration event at the ExxonMobil Baton Rouge Refinery. The Sulfur Recovery Unit (SRLA) was undergoing monthly equipment evaluation when material that is normally routed from SRLA to the Tail Gas Clean Up Unit (TGCU) instead bypassed TGCU and was directed to the SRLA incinerators. This resulted in approximately 476 pounds of sulfur dioxide emissions above the incinerator permit limit. The cause of this release was inadvertent human error. Within the same twenty four hour period, the Powdered Catalyst Unit(PCLA) experienced seal leaks on furnace F-301. The furnace produces steam, and the steam production tubes exit the furnace convection section. Seals where the steam tubes exit the furnace were leaking, allowing flue gas containing sulfur dioxide to exit the furnace. The leaks released 30 pounds of sulfur dioxide to the atmosphere. Together, these two releases emitted approximately 506 pounds of SO2. There were no offsite impacts, injuries, or complaints as a result of this incident.

Discharge Preventable - Yes

No further information provided.

Notes/Remedial Actions

To end the release, SRLA tail gas was routed through the Tail Gas Clean Up Unit (TGCU). After further review, ExxonMobil determined that the leaks from the Powdered Catalyst Unit were successfully repaired prior to February 24, 2011. Approximately 476 pounds of sulfur dioxide were released on February 24 due to Tail Gas Incineration. No reportable quantities were exceeded. Total sum of two incidents in 24 hours was 506 lbs which is reportable quantity.