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Shell Chemical East (26336), Norco
LDEQ Accident Report
| Accident # | 97746 |
| State Police # | 07-03822 |
| Accident Date | 2007-07-10 |
| 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 Dioxide | 1d 1h 15m | OL-5 Flare (EPN #6-84) | NO | YES | NO | 73.9 pounds |
| Carbon Monoxide | 1d 1h 15m | OL-5 Flare (EPN #6-84) | NO | YES | NO | 10.5 pounds |
| Nitrogen Oxide | 1d 1h 15m | OL-5 Flare (EPN #6-84) | NO | YES | YES | 1.9 pounds |
| Particulate Matter | 1d 1h 15m | OL-5 Flare (EPN #6-84) | NO | YES | NO | 0.4 pounds |
| Volatile Organic Compounds (VOCs) | 1d 1h 15m | OL-5 Flare (EPN #6-84) | NO | NO | YES | 2.8 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.
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