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Accident # | 96570 |
State Police # | 07-02787 |
Accident Date | 2007-05-29 |
Report Date | 2007-06-04 |
Follow-up Date | 0000-00-00 |
Follow-up: | Yes |
Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
Sulfur Dioxide | 10h 30m | High vibration trip in the HCU Recycle Gas Compressor | NO | YES | NO | 789.0 pounds |
Accident Classified As:
the startup of the #3 Sulfur Recovery Unit was a result of a shutdown of said unit which was the result of a lack of feed after an automatic safety shutdown of the Hydrocracker (high vibration trip in the HCU Recycle Gas Compressor). The vibration in the compressor was apparently due to surging in the unit during low flow conditions.
This incident was not preventable because the erratic performance was not a predictable event. Remedial Measures - MOUSA installed mechanical stops on the spillback valves to prevent erratic performance during low flow situations. MOUSA modified its startup procedure to eliminate the TGT Bypass.
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