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Accident # | 148240 |
State Police # | 13-01715 |
Accident Date | 2013-04-20 |
Report Date | 2013-04-25 |
Follow-up Date | 2013-10-23 |
Follow-up: | Yes |
Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
Sulfur Dioxide | 1H 23M | Unit 259 North Ground Flare | NO | YES | NO | 75.9 pounds |
Methane | 1H 23M | Unit 259 North Ground Flare | YES | NO | YES | 17.5 pounds |
Ethane | 1H 23M | Unit 259 North Ground Flare | NO | NO | YES | 1.7 pounds |
Ethylene | 1H 23M | Unit 259 North Ground Flare | NO | NO | YES | 0.1 pounds |
Propane | 1H 23M | Unit 259 North Ground Flare | NO | NO | YES | 3.9 pounds |
n-Butane | 1H 23M | Unit 259 North Ground Flare | NO | NO | NO | 2.3 pounds |
Isobutane | 1H 23M | Unit 259 North Ground Flare | NO | NO | YES | 2.1 pounds |
1-Butene | 1H 23M | Unit 259 North Ground Flare | NO | NO | YES | 0.0 pounds |
cis-2-Butene | 1H 23M | Unit 259 North Ground Flare | NO | NO | NO | 0.0 pounds |
Carbon Dioxide | 1H 23M | Unit 259 North Ground Flare | YES | NO | NO | 43.7 pounds |
Hydrogen | 1H 23M | Unit 259 North Ground Flare | NO | NO | NO | 4.1 pounds |
Nitrogen | 1H 23M | Unit 259 North Ground Flare | NO | NO | NO | 0.9 pounds |
Hydrogen Sulfide | 1H 23M | Unit 259 North Ground Flare | NO | NO | NO | 0.8 pounds |
NOx | 1H 23M | Unit 259 North Ground Flare | NO | NO | YES | 3.0 pounds |
Carbon Monoxide | 1H 23M | Unit 259 North Ground Flare | NO | YES | NO | 16.1 pounds |
Volatile Organic Compounds (VOCs) | 1H 23M | Unit 259 North Ground Flare | NO | NO | YES | 8.5 pounds |
Particulate Matter 10 | 1H 23M | Unit 259 North Ground Flare | NO | YES | NO | 0.3 pounds |
Particulate Matter 2.5 | 1H 23M | Unit 259 North Ground Flare | NO | YES | NO | 0.3 pounds |
Highly Reactive Volatile Organic Compounds (HRVOCs) | 1H 23M | Unit 259 North Ground Flare | NO | NO | NO | 0.1 pounds |
Accident Classified As: Below Reportable Quantity (BRQ)
On April 20, 2013 the Unit 210 Crude Unit experienced an upset due to a change in the incoming crude state. The flaring in U210 and U222 associated with the upset started at 7:12 AM on April 20, 2013 and was complete at 8:35 AM on April 20, 2013. The duration of Unit 210 and 222 venting to the North Ground Flare was 83 minutes. Approximately 75 pounds of sulfur dioxide were released. The Unit 210 Crude Unit experienced an upset due to a change in the incoming crude state. The incoming crude had a greater quantity of light components as well as some water. The upset resulted in high liquid levels in vessels upstream of the crude off-gas compressors and the sals gas compressor. In order to minimize the amount of liquid sent to the compressors, which could cause a shutdown of the compressor, a portion of the liquid generated in the upset was routed to the North Ground Flare knock out drum. This action reduced the severity of the incident.
The routing of liquids to the flare was done intentionally to remove excess liquid in the gas streams faster and prevent a shutdown of the crude off-gas compressor, which would have resulted in a flaring event with a significantly higher quantity of emissions.
The crude tank line up was modified to remove the tank thought to be the cause of the water and light ends going to the Crude Unit. In addition, the crude charge rate was reduced to help manage the unit upset. The routing of liquids to the flare knock out drum was an attempt to minimize the results of the upset and prevent equipment shutdowns which would ahve resulted in a much more significant release. An additional followup on 10/23/13 corrected the initial followup report's emissions data regarding greenhouse gas releases.
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