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ExxonMobil Refinery (2638), Baton Rouge

LDEQ Accident Report

Accident #127174
State Police #10-06165
Accident Date2010-10-21
Report Date 2010-10-26
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
Flammable Vapor1 h 39 mAlkytation UnitNONOYES706.0 pounds

Accident Classified As: Below Reportable Quantity (BRQ)

Cause of Problem: Corrosion

The Baton Rouge Refinery (BRRF) Alkylation Unit experience a release. This release did not exceed RQ. However a second release occurred at the Refinery's Mixed Gas Oil tanks within the same 24 hours, and the sum of these emissions exceed RQ for flammable vapor. The Alky Unit leak is described in this report. Please see report for Louisiana State Police Incident #10-06175 for a description of the MGO tank release as well as the sum of the day's emissions. A leak in the body of an orbit valve in Alky Unit's Stratco Train was discovered. The valve is located on the purge refrigeration gas system. Upon discovery, the purge gas system was depressured and shut down to end the release.

Discharge Preventable - No

This leak was not preventable as it was caused by unanticipated corrosion.

Notes/Remedial Actions

Stracto Train's purge gas system was shut down. The corroded carbon steel valve has been replaced with a stainless steel valve. Release was BRQ. Exxon exceeded the reportable quantity threshold for flammable vapors when combined with a second release that occurred within 24 hours. The second release had the LDEQ number 127179. Combined 1,563 pounds for both incidents. Although this individual incident is BRQ, the sum of the two incidents are RQ.