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Marathon Ashland Petroleum (3165), Garyville

LDEQ Accident Report

Accident #157829
PDF AvailablePDF
State Police #14-03362
Accident Date2014-08-01
Report Date 2014-08-08
Follow-up Date 2014-09-30
Follow-up: Yes

Pollutants Released

Pollutant Duration Point Source Greenhouse Gas Criteria Pollutant Ozone forming chemical Amount of Release
Sulfur Dioxide14h 24mWet Gas CompressorNOYESNO3,297.0 pounds
Highly Reactive Volatile Organic Compounds (HRVOCs)14h 24mWet Gas CompressorNONONO363.0 pounds
NOxNONOYES580.9 pounds
Carbon MonoxideNOYESNO2,989.9 pounds
Volatile Organic Compounds (VOCs)NONOYES2,134.3 pounds
Particulate Matter 10NOYESNO230.7 pounds
Particulate Matter 2.5NOYESNO230.7 pounds
Hydrogen SulfideNONONO12.1 pounds
MethaneYESNOYES414.3 pounds
EthaneNONOYES107.4 pounds
EthyleneNONOYES18.2 pounds
AcetyleneNONONO0.4 pounds
PropaneNONOYES253.6 pounds
PropyleneNONOYES345.0 pounds
n-ButaneNONONO414.1 pounds
IsobutaneNONOYES2.0

Accident Classified As: Reportable Quantity

Cause of Problem: Equipment Failure

The wet gas compressor tripped due to a motor issue, which caused the overhead of the Fractionator to pressure up. The high pressure reached a safety limit and the unit shutdown. During the time that motor was undergoing repairs, fuel gas was routed into the unit to prevent excess oxygen from getting into the unit regenerator, fractionator and overhead accumulator which resulted in flaring. The unit was then started up in accordance with a written procedures. An incident investigation was conducted and identified Equipment Difficulty-Equipment/Parts Defective-Manufacturing as the Root Cause. Investigation states that the trip was initiated by the motor differential circuit detecting a differential of currency within the motor. The motor relay was initially expected to be the issue.

Discharge Preventable - No

This was an unanticipated failure of the motor relay. The motor and relay tested good during the day on 08/1/14. In addition, the relay passed all self tests by the relay manufacturer.

Notes/Remedial Actions

The SIS system reacted as designed to shutdown the Fluid Catalytic Cracking Unit (FCCU) due to the high pressure in the fractionator. An incident investigation was conducted and included the following recommendations: 1) Send relay to manufacturer for analysis (Complete), 2) Review findings from the manufacturer (Complete), 3) Test the differential circuit at the next available opportunity (Deadline-10/31/16)