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Accident # | 79189 |
State Police # | 05-03283 |
Accident Date | 2005-05-19 |
Report Date | 2005-05-26 |
Follow-up Date | 0000-00-00 |
Follow-up: | No |
Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
Nitric Oxide | 9h | Hydrocracker Light Ends Plant - Butane Splitter Tower | NO | YES | NO | 77.0 pounds |
Sulfur Dioxide | 9h | Hydrocracker Light Ends Plant - Butane Splitter Tower | NO | YES | NO | 1,176.0 pounds |
Accident Classified As: Reportable Quantity
Unit upset, pressure increase: Excess feed to the Depropanizer Tower caused overpressure. Hydrocracker Light Ends Plant Butane Splitter Tower overpressured, which caused propane to exit to the Butane Splitter from the excess feed in the Depropanizer Tower via the Depropanizer Bottoms. The material was vented to the refinery flare system to reduce pressure.
Moves to reduce temperature and pressure were made in effort to prevent the depressurization of the Butane Splitter to the refinery flare system. Cooler back flushing was conducted in order to ensure that maximum cooling was available, heater firing was reduced in order to reduce tower temperatures and pressures.
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