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Marathon Ashland Petroleum (3165), Garyville

LDEQ Accident Report

Accident #157392
PDF AvailablePDF
State Police #14-03067
Accident Date2014-07-13
Report Date 2014-07-18
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
Methane21mUnit 215, Hydrocracking UnitYESNOYES12.0 pounds
Ethane21mUnit 215, Hydrocracking UnitNONOYES2.8 pounds
Propane21mUnit 215, Hydrocracking UnitNONOYES3.2 pounds
n-Butane21mUnit 215, Hydrocracking UnitNONONO1.4 pounds
Hydrogen21mUnit 215, Hydrocracking UnitNONONO435.1 pounds
Hydrogen Sulfide21mUnit 215, Hydrocracking UnitNONONO4.6 pounds

Accident Classified As: Below Reportable Quantity (BRQ)

Cause of Problem: Seal or Gasket

While checking the 215-PSV-7006 cold HP separator for a leak, the downstream 12-inch block valve was closed and a leak developed around the valve bonnet gasket. The leak size was assumed to be 1/64-inch in thickness and 2 inches in width based on operator reports. Emission occurred in Unit 215, Hydrocracking Unit.

Discharge Preventable - Under Investigation

Results of internal investigation will determine whether release was preventable.

Notes/Remedial Actions

The line containing the valve was blocked in and the pressure reduced. An incident investigation will result in recommendation items designed to prevent the recurrence of this event.