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Accident # | 101968 |
State Police # | 07-4488 |
Accident Date | 2007-12-29 |
Report Date | 2008-01-04 |
Follow-up Date | 0000-00-00 |
Follow-up: | No |
Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
Hydrogen Sulfide | 6 hours (21:15-3:15) | Unit 34 thermal oxidizer | NO | NO | NO | BRQ |
Sulfur Dioxide | 6 hours (21:15-3:15) | Unit 34 termal oxidizer | NO | YES | NO | BRQ |
Accident Classified As:
The Amine Unit 47 shutdown when amine circulation was lost because of a control valve failing to close.
Under investigation to determine if accident was preventable. Investigation will be completed in 60 days.
The shutdown of Unit 45 Sulfur Recover unit reduced the acid gas (hydrogen sulfide-H2S) processing capacity by 1/3. To reduce the acid gas Marathon implemented "sulfur shedding procedures", involving reducing feed desulfurization units and the Coker . A manual bypass valve was opened to restore circulation. Sulfur dioxide limit (250 ppm) on Unit 34 thermal oxidizer and hydrogen sulfide limit 160ppm on the fuel gas system were exceeded.
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