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Marathon Ashland Petroleum (3165), Garyville

LDEQ Accident Report

Accident #148807
PDF AvailablePDF
State Police #13-02196
Accident Date2013-05-19
Report Date 2013-05-23
Follow-up Date 2013-07-17
Follow-up: Yes

Pollutants Released

Pollutant Duration Point Source Greenhouse Gas Criteria Pollutant Ozone forming chemical Amount of Release
Methane38mFlow indicator 15FI0214YESNOYES829.2 pounds
Ethane38mFlow indicator 15FI0214NONOYES797.6 pounds
Propane38mFlow indicator 15FI0214NONOYES1,063.9 pounds
n-Butane38mFlow indicator 15FI0214NONONO382.4 pounds
Isobutane38mFlow indicator 15FI0214NONOYES412.7 pounds
n-Pentane38mFlow indicator 15FI0214NONONO105.5 pounds
Pentene Plus38mFlow indicator 15FI0214NONONO556.6 pounds
Hydrogen38mFlow indicator 15FI0214NONONO1,847.9 pounds
Hydrogen Sulfide38mFlow indicator 15FI0214NONONO28.8 pounds
Isopentane38mFlow indicator 15FI0214NONOYES218.5 pounds

Accident Classified As: Reportable Quantity

Cause of Problem: Equipment Design

On May 19, the impulse lines on flow indicator 15FI0214 pulled away from the root valve. Blow taps on the valve blew off and released make-up hydrogen to the atmosphere. The causal factors leading to the failure of the tubing was Equipment Difficulty/Design Specs/Problem Not Anticipated. There were issues with the metallurgy of the tubing and the elevation of the transmitter in relation to the orifice taps.

Discharge Preventable - No

There were issues with the metallurgy of the tubing and the elevation of the transmitter in relation to the orifice taps.

Notes/Remedial Actions

Water from the fire monitors was sprayed on the release to help disperse the gas and prevent ignition. The board operator began depressurizing the unit through the dump valve in preparation for emergency shutdown. The line was isolated from the rest of the process unit to prevent further release of make-up hydrogen. To prevent recurrence, the following recommendations were made: 1) relocate the transmitter above the orifice taps on 15FE0214, and 2) replace stainless steel components of 15FT0214, including the impulse tubing with Hastelloy to prevent chloride-induced stress corrosion cracking. Also to tag the instrument tubing to indicate that the material is Hastelloy. Approximately 6.214 pounds of compressed flammable gas and 28 pounds of hydrogen sulfide were released.