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Marathon Ashland Petroleum (3165), Garyville

LDEQ Accident Report

Accident #120620
PDF AvailablePDF
State Police #10-00113
Accident Date2010-01-15
Report Date 2010-01-08
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
Sulfur Dioxide1h 10mSouth Ground Flare (EQT 0284)NOYESNO2,413.0 pounds
Hydrogen1h 10mSouth Ground Flare (EQT 0284)NONONO1.2 pounds
Methane1h 10mSouth Ground Flare (EQT 0284)YESNOYES2.6 pounds
Ethane1h 10mSouth Ground Flare (EQT 0284)NONOYES5.7 pounds
Propane1h 10mSouth Ground Flare (EQT 0284)NONOYES12.5 pounds
Isobutane1h 10mSouth Ground Flare (EQT 0284)NONOYES6.1 pounds
n-Butane1h 10mSouth Ground Flare (EQT 0284)NONONO11.5 pounds
Pentane1h 10mSouth Ground Flare (EQT 0284)NONOYES0.2 pounds
n-Pentane1h 10mSouth Ground Flare (EQT 0284)NONONO0.1 pounds
Pentene1h 10mSouth Ground Flare (EQT 0284)NONONO7.8 pounds
Hydrogen Sulfide1h 10mSouth Ground Flare (EQT 0284)NONONO6.4 pounds
Water1h 10mSouth Ground Flare (EQT 0284)NONONO0.6 pounds

Accident Classified As:

Cause of Problem: Equipment Failure

New Naphtha Hydrotreating Unit relief valve failed--opened intermittently at lower pressures than it was supposed to and sent stream to flare. Discovered problem thanks to citizen complaint re: the smell. Reportable quantity for SO2 exceeded. Duration given below is an estimate; emissions were intermittent from 1758 hrs to 2215 hrs.

Discharge Preventable - No

"Unforeseeable failure."

Notes/Remedial Actions

RQ. Faulty valve taken out of service & sent for repairs. RQ. Detailed release calculations attached to refinery letter.