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Marathon Ashland Petroleum (3165), Garyville

LDEQ Accident Report

Accident #136157
State Police #11-08042
Accident Date2011-12-27
Report Date 2012-01-03
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
Nitrogen Oxide20 m205 Coker Unit to Unit 259 North Ground FlareNOYESYES6.4 pounds
Particulate Matter 1020 m205 Coker Unit to Unit 259 North Ground FlareNOYESNO0.6 pounds
Carbon Monoxide20 m205 Coker Unit to Unit 259 North Ground FlareNOYESNO6.8 pounds
Sulfur Dioxide20 m205 Coker Unit to Unit 259 North Ground FlareNOYESNO591.0 pounds
Hydrocarbon20 m205 Coker Unit to Unit 259 North Ground FlareNONOYES55.7 pounds
Highly Reactive Volatile Organic Compounds (HRVOCs)20 m205 Coker Unit to Unit 259 North Ground FlareNONONO1.3 pounds
Volatile Organic Compounds (VOCs)20 m205 Coker Unit to Unit 259 North Ground FlareNONOYES8.5 pounds

Accident Classified As: Reportable Quantity

Cause of Problem: Process Upset

The incident occurred when the facility was switching from the online drum to the blowdown drum. During the switch, the Wet Gas Compressor surge controller attempted to open the second stage spillback valve. The valve hesitated to open, causing a spillback to trip open. This caused the frac and blowdown to pressure up and the compressor to send the product to the flare until the operations pressure returned to normal. At the time of the written notification, the incident was still being investigated to determine the cause of the overpressure condition.

Discharge Preventable - Under Investigation

Marathon is further investigating the incident, but at the time of the written notification, the incident did not appear to have been preventable. An incident investigation was ongoing at the time of the written notification in order to determine specific remedial action necessary to prevent recurrence.

Notes/Remedial Actions

The unit pressure levels were automatically corrected by the wet gas compressor surge control system.