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Marathon Ashland Petroleum (3165), Garyville

LDEQ Accident Report

Accident #146138
PDF AvailablePDF
State Police #13-00251
Accident Date2013-01-17
Report Date 2013-01-25
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
Nitrogen Oxide3h 44mUnit 259 North Ground FlareNOYESYES89.6 pounds
Carbon Monoxide3h 44mUnit 259 North Ground FlareNOYESNO487.3 pounds
Volatile Organic Compounds (VOCs)3h 44mUnit 259 North Ground FlareNONOYES1,138.0 pounds
Particulate Matter 103h 44mUnit 259 North Ground FlareNOYESNO9.8 pounds
Particulate Matter 2.53h 44mUnit 259 North Ground FlareNOYESNO9.8 pounds
Highly Reactive Volatile Organic Compounds3h 44mUnit 259 North Ground FlareNONOYES1.3 pounds
Methane3h 44mUnit 259 North Ground FlareYESNOYES96.1 pounds
Ethane3h 44mUnit 259 North Ground FlareNONOYES11.9 pounds
Ethylene3h 44mUnit 259 North Ground FlareNONOYES0.7 pounds
Propane3h 44mUnit 259 North Ground FlareNONOYES75.7 pounds
Propylene3h 44mUnit 259 North Ground FlareNONOYES0.6 pounds
n-Butane3h 44mUnit 259 North Ground FlareNONONO565.1 pounds
Isobutane3h 44mUnit 259 North Ground FlareNONOYES442.3 pounds
1-Butene3h 44mUnit 259 North Ground FlareNONOYES3.4 pounds
Pentene Plus3h 44mUnit 259 North Ground FlareNONONO46.0 pounds
Carbon Dioxide3h 44mUnit 259 North Ground FlareYESNONO3.4 pounds
Hydrogen3h 44mUnit 259 North Ground FlareNONONO3.2 pounds
Nitrogen3h 44mUnit 259 North Ground FlareNONONO7.4 pounds

Accident Classified As: Below Reportable Quantity (BRQ)

Cause of Problem: Instrument Failure

Unit 222 Sats Gas Plant experienced an upset due to an over-pressure condition on the debutanizer column. As a result, pressure relief valves lifted, sending debutanizer overhead material to the refinery's North Ground Flare. Root cause was a faulty pressure transmitter.

Discharge Preventable - Not Applicable

According to their letter from january 23, 2013, "NA; the event does not reach the level of a reportable release."

Notes/Remedial Actions

The Board Operator decreased pressure on the debutanizer column. The faulty transmitter was replaced. Initial reports from January, 2013 stated no permit limits were exceeded concerning released pollutants. Final calculations from April 4, 2013 determined otherwise.