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Marathon Ashland Petroleum (3165), Garyville

LDEQ Accident Report

Accident #119673
State Police #093811
Accident Date2009-11-23
Report Date 2009-10-25
Follow-up Date 2009-12-14
Follow-up: Yes

Pollutants Released

Pollutant Duration Point Source Greenhouse Gas Criteria Pollutant Ozone forming chemical Amount of Release
Nitrogen8 minuteskerosene hydrotreater unitNONONO24.2 pounds
Hydrogen8 minuteskerosene hydrotreater unitNONONO3.7 pounds
Hydrogen Sulfide8 minuteskerosene hydrotreater unitNONONO3.5 pounds
Methane8 minuteskerosene hydrotreater unitYESNOYES0.5 pounds
Ethane8 minuteskerosene hydrotreater unitNONOYES0.8 pounds
Propane8 minuteskerosene hydrotreater unitNONOYES2.7 pounds
n-Butane8 minuteskerosene hydrotreater unitNONONO2.0 pounds
1-Pentene8 minuteskerosene hydrotreater unitNONOYES0.5 pounds
n-Pentane8 minuteskerosene hydrotreater unitNONONO3.2 pounds
Butane8 minuteskerosene hydrotreater unitNONOYES5.0 pounds

Accident Classified As:

Cause of Problem: Human Factors

During start-up of the kerosene hydrotreater unit (KHT), a bleeder valve o a piperack outside the unit was inadvertently left open, releasing gas into the atmosphere.

Discharge Preventable - Yes

a valve was left open.

Notes/Remedial Actions

the line was isolated, and the valve was closed.