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|State Police #||12-07383|
|Pollutant||Duration||Point Source||Greenhouse Gas||Criteria Pollutant||Ozone forming chemical||Amount of Release|
|Carbon Monoxide||3h 45m||Olefins Flare (EPN 6-84)||NO||YES||NO||11.4 pounds|
|Nitrogen Dioxide||3h 45m||Olefins Flare (EPN 6-84)||NO||YES||YES||2.1 pounds|
|Particulate Matter||3h 45m||Olefins Flare (EPN 6-84)||NO||YES||NO||0.4 pounds|
|Sulfur Dioxide||3h 45m||Olefins Flare (EPN 6-84)||NO||YES||NO||149.7 pounds|
|Volatile Organic Compounds (VOCs)||3h 45m||Olefins Flare (EPN 6-84)||NO||NO||YES||4.7 pounds|
Accident Classified As: Below Reportable Quantity (BRQ)
On November 13, 2012 at 08:45 hours, Motiva's Diesel Hydrotreater (DHT) flared vent gas to Shell Chemical's OL-5 elevated flare. This flaring was due to the DHT vent gas compressor (K-5337) tripping as a result of a high liquid level in the stripper's overhead accumulator (PV-1987) and in the compressor's interstage knock out pot (PV-1988). In addition, the DHT's recycle compressor (K5339) tripped due to high level in the recycle gas compressor knock out pot (PV-2028).
No remedial actions were given. The flaring occurred at Shell Chemical East, but was caused by a compressor tripping at Motiva Enterprises Norco Refinery's Diesel Hydrotreater (DHT) unit. No reportable quantities were exceeded; however the permitted limits for sulfur dioxide were exceeded as a result of this release. Only gives the total VOCs released in the Permitted Source Emissions table; no breakdown per chemical even though they stated some of the released VOCs in their written notification (ethane, hydrogen sulfide, isobutane, methane, n-butane, and propane). SPOC states that 6000-7000 lbs per hour were sent to the elevated flare, and with a 99% flare efficiency it only resulted in 32 lbs of hydrocarbons being released per hour.