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ExxonMobil Chemical Plant (286), Baton Rouge

LDEQ Accident Report

Accident #113980
State Police #09-01685
Accident Date2009-04-06
Report Date 2010-03-25
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 Gas2 mRTO unitNONOYES1,000.0 pounds
Ethylene2 mRTO unitNONOYES2,348.0 pounds
Propylene2 mRTO unitNONOYES3,470.0 pounds
Volatile Organic Compounds (VOCs)2 mRTO unitNONOYES100.0 pounds
1,3-Butadiene2 mRTO unitNONOYES10.0 pounds
Benzene2 mRTO unitNONOYES10.0 pounds
Sulfur Dioxide2 mRTO unitNOYESNO500.0 pounds
Highly Reactive Volatile Organic Compounds (HRVOCs)NONONO 

Accident Classified As: No Information Given

Cause of Problem: Instrument Failure

RTO unit atmospheric safety and associated flaring caused by loss of an electronic card and computer failure. Failure of a computer control card resulted in several control valves to fail in the closed position and the atmospheric safety valve then lifted to the flare.

Discharge Preventable - No Information Given

Non preventable released as failure of computer card could not be anticipated.

Notes/Remedial Actions

The card was replaced with a spare and the unit operations were reduced to minimize released.