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Valero (26003), Norco

LDEQ Accident Report

Accident #140250
State Police #12-03454
Accident Date2012-06-05
Report Date 2012-06-11
Follow-up Date 0000-00-00
Follow-up: No

Pollutants Released

Pollutant Duration Point Source Greenhouse Gas Criteria Pollutant Ozone forming chemical Amount of Release
Carbon Monoxide9mwet gas compressorNOYESNO54.0 pounds
Nitrogen Oxide9mwet gas compressorNOYESYES10.0 pounds
Volatile Organic Compounds (VOCs)9mwet gas compressorNONOYES20.0 pounds
Sulfur Dioxide9mwet gas compressorNOYESNO1,160.0 pounds
Hydrogen Sulfide9mwet gas compressorNONONO3.0 pounds

Accident Classified As: Reportable Quantity

Cause of Problem: Equipment Failure

The wet gas compressor in the delayed coking unit malfunctioned resulting in excess H2S and SO2 emissions at Flares 1 and 2.

Discharge Preventable - Under Investigation

The refinery stated this information would be provided in a follow up report but no follow up was given.

Notes/Remedial Actions

Gas from the coker was combusted in flare 1 and flare 2 and the resulting combustion byproducts rapidly dispersed. Emissions were minimized by restarting the wet gas compressor. The incident is still under investigation. No procedures or preventative measures have been identified at this time.