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Shell Chemical East (26336), Norco

LDEQ Accident Report

Accident #97746
PDF AvailablePDF
State Police #07-03822
Accident Date2007-07-10
Report Date 2007-07-17
Follow-up Date 2007-11-28
Follow-up: Yes

Pollutants Released

Pollutant Duration Point Source Greenhouse Gas Criteria Pollutant Ozone forming chemical Amount of Release
Sulfur Dioxide1d 1h 15mOL-5 Flare (EPN #6-84)NOYESNO73.9 pounds
Carbon Monoxide1d 1h 15mOL-5 Flare (EPN #6-84)NOYESNO10.5 pounds
Nitrogen Oxide1d 1h 15mOL-5 Flare (EPN #6-84)NOYESYES1.9 pounds
Particulate Matter1d 1h 15mOL-5 Flare (EPN #6-84)NOYESNO0.4 pounds
Volatile Organic Compounds (VOCs)1d 1h 15mOL-5 Flare (EPN #6-84)NONOYES2.8 pounds

Accident Classified As: Reportable Quantity

Cause of Problem: Process Upset

Instrument problems at DHT (diesel hydrotreater) Process Unit caused a vent gas compressor to trip, resulted in flaring at Shell Chemical's OL-5 elevated flare.

Discharge Preventable - No

Notes/Remedial Actions

Upon discovery, Motiva operations secured the DHT unit and shutdown the unit. Motiva's long-term plan to prevent recurrence is to install plug connectors on the unused pins of the DeltaV backplans. The plug connectors will be installed once the manufacturer provides suitable plugs that have been tested to allow problem-free installation and as control systems can be powered down during planned unit shutdowns to allow the installations of the plugs.