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Marathon Ashland Petroleum (3165), Garyville
LDEQ Accident Report
| Accident # | 157392 |
| State Police # | 14-03067 |
| Accident Date | 2014-07-13 |
| Report Date | 2014-07-18 |
| 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 |
| Methane | 21m | Unit 215, Hydrocracking Unit | YES | NO | YES | 12.0 pounds |
| Ethane | 21m | Unit 215, Hydrocracking Unit | NO | NO | YES | 2.8 pounds |
| Propane | 21m | Unit 215, Hydrocracking Unit | NO | NO | YES | 3.2 pounds |
| n-Butane | 21m | Unit 215, Hydrocracking Unit | NO | NO | NO | 1.4 pounds |
| Hydrogen | 21m | Unit 215, Hydrocracking Unit | NO | NO | NO | 435.1 pounds |
| Hydrogen Sulfide | 21m | Unit 215, Hydrocracking Unit | NO | NO | NO | 4.6 pounds |
Accident Classified As: Below Reportable Quantity (BRQ)
Cause of Problem: Seal or Gasket
While checking the 215-PSV-7006 cold HP separator for a leak, the downstream 12-inch block valve was closed and a leak developed around the valve bonnet gasket. The leak size was assumed to be 1/64-inch in thickness and 2 inches in width based on operator reports. Emission occurred in Unit 215, Hydrocracking Unit.
Discharge Preventable - Under Investigation
Results of internal investigation will determine whether release was preventable.
Notes/Remedial Actions
The line containing the valve was blocked in and the pressure reduced. An incident investigation will result in recommendation items designed to prevent the recurrence of this event.
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