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Accident # | 129573 |
State Police # | 11-01145 |
Accident Date | 2011-03-01 |
Report Date | 2011-03-04 |
Follow-up Date | 0000-00-00 |
Follow-up: | No |
Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
Sulfur Dioxide | 16 m | Flare | NO | YES | NO | 1,014.0 pounds |
Accident Classified As: Reportable Quantity
Malfunction of the compressor spillback valve. The Fluidized Catalytic Cracker (FCC) main fractionator overhead accumulator pressure control valve (79PC502F) began to open to flare due to a sudden increase in pressure in the accumulator, which led to flaring at the #1 Flare. The sudden pressure increase was the result of a stuck compressor spillback valve.
Not Preventable. The valve malfunction was unpredicted and unforeseen.
Feed rate to the unit was reduced, pressure was reduced and the pressure control valve setpoint was raised. CRLLC has determined the cause of this release to be a malfunction of the compressor spillback valve. The valve has been evaluated by a technician and the pressure control valve setpoints are being reviewed.
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