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Marathon Ashland Petroleum (3165), Garyville

LDEQ Accident Report

Accident #141908
State Police #12-05247
Accident Date2012-08-08
Report Date 2012-08-10
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
Propane24mRBS FlareNONOYES0.1 pounds
n-Butane24mRBS FlareNONONO0.6 pounds
Isobutane24mRBS FlareNONOYES2.2 pounds
1-Butene24mRBS FlareNONOYES0.9 pounds
Isobutylene24mRBS FlareNONOYES1.1 pounds
T-butene224mRBS FlareNONONO1.1 pounds
cis-2-Butene24mRBS FlareNONONO0.8 pounds
Nitrogen Oxide24mRBS FlareNOYESYES0.5 pounds
Carbon Monoxide24mRBS FlareNOYESNO2.5 pounds
Particulate Matter 1024mRBS FlareNOYESNO0.1 pounds
Particulate Matter 2.524mRBS FlareNOYESNO0.1 pounds
1-Pentene24mRBS FlareNONOYESBRQ
1,3-Butadiene24mRBS FlareNONOYESBRQ
Volatile Organic Compounds (VOCs)24mRBS FlareNONOYES6.7 pounds

Accident Classified As: Below Reportable Quantity (BRQ)

Cause of Problem: Instrument Failure

False reading on the 66LT0511 level controller caused the two NC4 compressors to trip. The high pressure on the receiver, due to high liquid level, caused the 66PC0507 valve on the receiver to open the RBS flare. Approximately 6.67 lbs of VOCs were released as a result.

Discharge Preventable - No

The level transmitter failed without warning.

Notes/Remedial Actions

The operator blew down transmitter 66LT0511 and opened the bypass valve on the receiver to send the liquid back to the RBS tank. The faulty level transmitter was taken out of service and repaired.