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Marathon Ashland Petroleum (3165), Garyville
LDEQ Accident Report
| Accident # | 115023 |
| State Police # | 091520 |
| Accident Date | 2009-05-16 |
| Report Date | 2009-05-20 |
| Follow-up Date | 2009-10-01 |
| Follow-up: | Yes |
Pollutants Released
| Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
| Methane | 29 hours | Platformer Debutanizer Trim Cooler, #1 Cooling Tower EQI: 61a-74 | YES | NO | YES | 0.9 pounds |
| Ethane | 29 hours | Platformer Debutanizer Trim Cooler, #1 Cooling Tower EQI: 61a-74 | NO | NO | YES | 36.9 pounds |
| Propane | 29 hours | Platformer Debutanizer Trim Cooler, #1 Cooling Tower EQI: 61a-74 | NO | NO | YES | 157.8 pounds |
| Isobutane | 29 hours | Platformer Debutanizer Trim Cooler, #1 Cooling Tower EQI: 61a-74 | NO | NO | YES | 102.0 pounds |
| n-Butane | 29 hours | Platformer Debutanizer Trim Cooler, #1 Cooling Tower EQI: 61a-74 | NO | NO | NO | 504.0 pounds |
| 1-Pentene | 29 hours | Platformer Debutanizer Trim Cooler, #1 Cooling Tower EQI: 61a-74 | NO | NO | YES | 54.0 pounds |
| n-Pentane | 29 hours | Platformer Debutanizer Trim Cooler, #1 Cooling Tower EQI: 61a-74 | NO | NO | NO | 28.0 pounds |
| Volatile Organic Compounds (VOCs) | 29 hours | Platformer Debutanizer Trim Cooler, #1 Cooling Tower EQI: 61a-74 | NO | NO | YES | 1,779.5 pounds |
Accident Classified As:
Cause of Problem: Corrosion
A high LEL was found at the #1 cooling tower, operations started checking for leaks and found that the debutanizer overhead trim cooler, 12-1309, was leaking hydrocarbons into the cooling water. Leak caused by under deposit corrosion.
Discharge Preventable - No
Failure was unforeseeable.
Notes/Remedial Actions
The debutanizer trim cooler was isolated and leaking tubing plugged.
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