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Marathon Ashland Petroleum (3165), Garyville
LDEQ Accident Report
| Accident # | 145377 |
| State Police # | 12-07880 |
| Accident Date | 2012-12-15 |
| Report Date | 2012-12-21 |
| Follow-up Date | 2013-10-09 |
| Follow-up: | Yes |
Pollutants Released
| Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
| Water | South Flare | NO | NO | NO | BRQ | |
| Nitrous Oxide | 18h 40m | South Flare | YES | YES | YES | 7.5 pounds |
| Compressed Flammable Gas | 18h 40m | South Flare | NO | NO | YES | 1,335.8 pounds |
| Nitrogen Oxide | 18h 40m | Unit 59 South Flare | NO | YES | YES | 385.0 pounds |
| Carbon Monoxide | 18h 40m | Unit 59 South Flare | NO | YES | NO | 2,095.0 pounds |
| Sulfur Dioxide | 18h 40m | Unit 59 South Flare | NO | YES | NO | 121.8 pounds |
| Volatile Organic Compounds (VOCs) | 18h 40m | Unit 59 South Flare | NO | NO | YES | 1,573.5 pounds |
| Particulate Matter 10 | 18h 40m | Unit 59 South Flare | NO | YES | NO | 42.2 pounds |
| Particulate Matter 2.5 | 18h 40m | Unit 59 South Flare | NO | YES | NO | 42.2 pounds |
| Highly Reactive Volatile Organic Compounds (HRVOCs) | 18h 40m | Unit 59 South Flare | NO | NO | NO | 9.9 pounds |
| Hydrogen Sulfide | 18h 40m | Unit 59 South Flare | NO | NO | NO | 395.0 pounds |
| Methane | 18h 40m | Unit 59 South Flare | YES | NO | YES | 893.6 pounds |
| Ethane | 18h 40m | Unit 59 South Flare | NO | NO | YES | 6.0 pounds |
| Ethylene | 18h 40m | Unit 59 South Flare | NO | NO | YES | 839.8 pounds |
| Propane | 18h 40m | Unit 59 South Flare | NO | NO | YES | 3.9 pounds |
| Propylene | 18h 40m | Unit 59 South Flare | NO | NO | YES | 3.9 pounds |
| n-Butane | 18h 40m | Unit 59 South Flare | NO | NO | NO | 264.5 pounds |
| Isobutane | 18h 40m | Unit 59 South Flare | NO | NO | YES | 264.5 pounds |
| n-Pentane | 18h 40m | Unit 59 South Flare | NO | NO | NO | 2.1 pounds |
| T-butene2 | 18h 40m | Unit 59 South Flare | NO | NO | NO | 2.8 pounds |
| cis-2-Butene | 18h 40m | Unit 59 South Flare | NO | NO | NO | 166.6 pounds |
| Pentene Plus | 18h 40m | Unit 59 South Flare | NO | NO | NO | 5,674.2 pounds |
| Carbon Dioxide | 18h 40m | Unit 59 South Flare | YES | NO | NO | 5,660.0 pounds |
| Hydrogen | 18h 40m | Unit 59 South Flare | NO | NO | NO | 1,255.4 pounds |
| Nitrogen | 18h 40m | Unit 59 South Flare | NO | NO | NO | 125.7 pounds |
| Oxygen | 18h 40m | Unit 59 South Flare | NO | NO | NO | 5.9 pounds |
| Compressed Flammable Liquid | 18h 40m | Unit 59 South Flare | NO | NO | YES | 10.6 pounds |
| Isopentane | 18h 40m | Unit 59 South Flare | NO | NO | YES | 6.3 pounds |
| n-Hexane | 18h 40m | Unit 59 South Flare | NO | NO | NO | 952.4 pounds |
| Ammonia | 18h 40m | South Flare | NO | NO | NO | 7.5 pounds |
Accident Classified As: Reportable Quantity
Cause of Problem: Piping or Tubing
A tube leaked on the Unit 15 Hot Separator Overhead Fin Fans at 17:52 hours. At 18:00, the unit was undergoing emergency shutdown procedures and the U15 dump valve was opened to the flare. The incident was a Gas Oil leak in the Unit 15 Hot separator Overhead Fin Fan Exchangers. This leak caused a vapor release of hydrocarbons and hydrogen in addition to a small amount of hydrogen sulfide.
Discharge Preventable - Under Investigation
Not known at this time; the results of the incident investigation will determine whether or not this was preventable.
Notes/Remedial Actions
PDF was too large to upload. Unit 15 was depressurized to the South Flare to safely isolate the leaking Overhead Fin Fan. Once the unit pressure was sufficiently low in the unit, the Fin Fans were isolated and the leak stopped. An incident investigation will result in recommendations to prevent recurrence. The reportable quantities for hydrogen sulfide, compressed flammable gas, and compressed flammable liquid were exceeded during this event. A report on October 9, 2013, removed greenhouse gas emissions and revised the estimate of VOC emissions.
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