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Accident # | 141583 |
State Police # | 12-04922 |
Accident Date | 2012-07-27 |
Report Date | 2012-08-02 |
Follow-up Date | 2012-09-10 |
Follow-up: | Yes |
Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
1,3-Butadiene | 1m | Relief Valve at Residual Catalytic Cracking Unit | NO | NO | YES | BRQ |
Benzene | 1m | Relief Valve at Residual Catalytic Cracking Unit | NO | NO | YES | BRQ |
Flammable Gas | 1m | Relief Valve at Residual Catalytic Cracking Unit | NO | NO | YES | 2,189.0 pounds |
Volatile Organic Compounds (VOCs) | 1m | Relief Valve at Residual Catalytic Cracking Unit | NO | NO | YES | BRQ |
Accident Classified As: Reportable Quantity
Motiva's Residual Catalytic Cracking Unit (RCCU) experienced a premature opening of a relief valve (RV) on the RCCU debutanizer column. The RCCU was operating under normal conditions at the time of the release, and operational data proves that the associated equipment did not reach the relief valve set point pressure to cause the RV to open. A contract pressure equipment company was called out to help identify any mechanical problems with the RV. Additionally, RCCU operations lowered the debutanizer column pressure 3psig aas a precautionary measure until troubleshooting efforts are completed. An update report was provided by Motiva on September 10, 2012.
This discharge was not preventable. RCCU operations had no indication of the imminent threat of RV-7205 relieving prematurely. This was classified as an unusual event. The valve was serviced and replaced.
A contract pressure equipment company was called out to help identify any mechanical problems with the RV. Additionally, RCCU operations lowered the debutanizer column pressure 3psig as a precautionary measure until troubleshooting efforts are completed. Upon investigation, the reportable quantity for flammable gas was exceeded in this release. 2189 pounds of flammable gas were were reported through the SPOC. The reportable quantity of flammable gas includes 1000 pounds. Refinery's attachment of listed pollutants released is too unfocused/fuzzy to read accurately.
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