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Marathon Ashland Petroleum (3165), Garyville
LDEQ Accident Report
| Accident # | 157829 |
| State Police # | 14-03362 |
| Accident Date | 2014-08-01 |
| Report Date | 2014-08-08 |
| Follow-up Date | 2014-09-30 |
| Follow-up: | Yes |
Pollutants Released
| Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
| Sulfur Dioxide | 14h 24m | Wet Gas Compressor | NO | YES | NO | 3,297.0 pounds |
| Highly Reactive Volatile Organic Compounds (HRVOCs) | 14h 24m | Wet Gas Compressor | NO | NO | NO | 363.0 pounds |
| NOx | NO | NO | YES | 580.9 pounds | ||
| Carbon Monoxide | NO | YES | NO | 2,989.9 pounds | ||
| Volatile Organic Compounds (VOCs) | NO | NO | YES | 2,134.3 pounds | ||
| Particulate Matter 10 | NO | YES | NO | 230.7 pounds | ||
| Particulate Matter 2.5 | NO | YES | NO | 230.7 pounds | ||
| Hydrogen Sulfide | NO | NO | NO | 12.1 pounds | ||
| Methane | YES | NO | YES | 414.3 pounds | ||
| Ethane | NO | NO | YES | 107.4 pounds | ||
| Ethylene | NO | NO | YES | 18.2 pounds | ||
| Acetylene | NO | NO | NO | 0.4 pounds | ||
| Propane | NO | NO | YES | 253.6 pounds | ||
| Propylene | NO | NO | YES | 345.0 pounds | ||
| n-Butane | NO | NO | NO | 414.1 pounds | ||
| Isobutane | NO | NO | YES | 2.0 |
Accident Classified As: Reportable Quantity
Cause of Problem: Equipment Failure
The wet gas compressor tripped due to a motor issue, which caused the overhead of the Fractionator to pressure up. The high pressure reached a safety limit and the unit shutdown. During the time that motor was undergoing repairs, fuel gas was routed into the unit to prevent excess oxygen from getting into the unit regenerator, fractionator and overhead accumulator which resulted in flaring. The unit was then started up in accordance with a written procedures. An incident investigation was conducted and identified Equipment Difficulty-Equipment/Parts Defective-Manufacturing as the Root Cause. Investigation states that the trip was initiated by the motor differential circuit detecting a differential of currency within the motor. The motor relay was initially expected to be the issue.
Discharge Preventable - No
This was an unanticipated failure of the motor relay. The motor and relay tested good during the day on 08/1/14. In addition, the relay passed all self tests by the relay manufacturer.
Notes/Remedial Actions
The SIS system reacted as designed to shutdown the Fluid Catalytic Cracking Unit (FCCU) due to the high pressure in the fractionator. An incident investigation was conducted and included the following recommendations: 1) Send relay to manufacturer for analysis (Complete), 2) Review findings from the manufacturer (Complete), 3) Test the differential circuit at the next available opportunity (Deadline-10/31/16)
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