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Marathon Ashland Petroleum (3165), Garyville
LDEQ Accident Report
| Accident # | 141908 |
| State Police # | 12-05247 |
| Accident Date | 2012-08-08 |
| 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 |
| Propane | 24m | RBS Flare | NO | NO | YES | 0.1 pounds |
| n-Butane | 24m | RBS Flare | NO | NO | NO | 0.6 pounds |
| Isobutane | 24m | RBS Flare | NO | NO | YES | 2.2 pounds |
| 1-Butene | 24m | RBS Flare | NO | NO | YES | 0.9 pounds |
| Isobutylene | 24m | RBS Flare | NO | NO | YES | 1.1 pounds |
| T-butene2 | 24m | RBS Flare | NO | NO | NO | 1.1 pounds |
| cis-2-Butene | 24m | RBS Flare | NO | NO | NO | 0.8 pounds |
| Nitrogen Oxide | 24m | RBS Flare | NO | YES | YES | 0.5 pounds |
| Carbon Monoxide | 24m | RBS Flare | NO | YES | NO | 2.5 pounds |
| Particulate Matter 10 | 24m | RBS Flare | NO | YES | NO | 0.1 pounds |
| Particulate Matter 2.5 | 24m | RBS Flare | NO | YES | NO | 0.1 pounds |
| 1-Pentene | 24m | RBS Flare | NO | NO | YES | BRQ |
| 1,3-Butadiene | 24m | RBS Flare | NO | NO | YES | BRQ |
| Volatile Organic Compounds (VOCs) | 24m | RBS Flare | NO | NO | YES | 6.7 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.
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