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Shell Chemical East (26336), Norco

Releases in 2007

LDEQ Accident Number
Accident Date
Point Source/Release CauseNotes

Point Source(s):
OL-5 Flare (EPN #6-84)

Sulfur Dioxide - 74 pounds
Carbon Monoxide - 10 pounds
Nitrogen Oxide - 2 pounds
Particulate Matter - 0 pounds
Volatile Organic Compounds (VOCs) - 3 pounds
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.
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.