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Marathon Ashland Petroleum (3165), Garyville

Causal Factor: Other - See text

LDEQ Accident Number
Accident Date
Point Source(s) Notes Amount of Release

No Information Given
Cause: LDEQ report states that a truck coming into the plant caught fire. FIRE.

Followup: No

Notes: No Information Given. LDEQ Report only. No Refinery Letter.



Unit 59 North Flare
Cause: The initiating incident was a pump seal fire in the Gasoline Desulfurization Unit (Unit 55). The fire was fueled by a leaking seal on the pump. Extinguishing the fire was delayed by inability to close an EIV on the suction side of the pump. This resulted in emergency shutdown of the unit. Two other events also occurred on this day including an upset in Sulfur Plant Unit 234 and a flame-out of the North Flare. Due to the fire and emergency shutdown of the Gasoline Desulfurization Unit, the Fluid Catalytic Cracking Unit cut feed, sending vent gas to the North Flare. Process vent gas was sent to the North Flare which increased the steam to the flare suddenly, snuffing the flare out.

Followup: Yes

Notes: PDF too large to upload (109 pages) To re-light the North Flare, steam was gradually decreased and natural gas was added to the flare gas to allow the two available igniters to relight the North Flare. Parts to repair the North Flare pilot system were already on order when this incident occurred. The North Flare was taken out of service when the parts were received and repaired on October 31, 2012. Spare pilot and igniter assemblies are now in stock so that repairs can be made in a timely fashion if an incident like this is to occur again. Total amount of pollutants released was 59438.44 lbs, but 90% was claimed to be efficiently burned off, resulting in 5943.59 lbs that were actually released. The reportable quantity for Highly Reactive Volatile Organic Compounds (HRVOCs) (100 pounds) was exceeded during the 24 hour period.
Volatile Organic Compounds (VOCs): 2,223.2 pounds
Highly Reactive Volatile Organic Compounds: 105.2 pounds
Nitrogen Oxide: 275.0 pounds
Carbon Monoxide: 1,496.5 pounds
Sulfur Dioxide: 260.1 pounds
Volatile Organic Compounds (VOCs): 5,133.2 pounds
Particulate Matter 10: 30.1 pounds
Particulate Matter 2.5: 30.1 pounds
Highly Reactive Volatile Organic Compounds (HRVOCs): 123.2 pounds
Benzene: 15.2 pounds
Hydrogen Sulfide: 1.3 pounds
Butane: 4.7 pounds
n-Butane: 74.3 pounds
Isobutane: 14.1 pounds
Pentane: 256.0 pounds
n-Pentane: 142.9 pounds
Pentene Plus: 727.1 pounds
Cyclohexane: 3.3 pounds
n-Hexane: 19.8 pounds
Toluene: 40.6 pounds
Propane: 30.7 pounds
T-butene2: 11.1 pounds
Methane: 61.0 pounds
Ethane: 28.6 pounds
Ethylene: 2.7 pounds
Propylene: 6.1 pounds
1-Butene: 8.4 pounds
Carbon Dioxide: 1.5 pounds
Hydrogen: 15.6 pounds
Nitrogen: 20.4 pounds
Oxygen: 0.4 pounds

FCCU Scrubber Vent (EQT#165, EIQ# 86-74)
Cause: There was no upset. The unit is operating as designed. Marathon performed the original stack test in response to learning of the possibility of the existence of HCN from a stack test performed at the Robinson, IL refinery. Robinson performed the stack test per the ICR issued by the U.S. EPA in March 2011. An incorrect stack diameter of 91.75 inches was use to calculate the mass emission rate. The correct stack diameter is 156 inches. Using the lower stack diameter caused the emission rate to be under reported in the 2012 report. 01/27/12- Caller reports a continuous release of hydrogen cyanide through the fluidized catalitic cracking unit. Upper bound reported as 150 lbs/day. http://www.nrc.uscg.mil/reports/rwservlet?standard_web+inc_seq=1001479 10/08/13- Caller states that based on updated stack test, hydrogen cyanide is being released over the permit limit (198 lbs/day). It is from fluidize catalytic cracking unit and it is continuous. The facility is permitted to release 235 lbs/day. Upper bound of release is 433 lbs/day. http://www.nrc.uscg.mil/reports/rwservlet?standard_web+inc_seq=1062414

Followup: Yes

Notes: The emissions were found during a stack test of the FCU and the Title V operating Permit will be modified to include these emissions. There were no remedial actions taken. A permit application is being prepared for submittal to the LDEQ. Additional testing will be performed November 2013 to verify emissions. Report states that modeling has been performed to determine teh ambient air concentrations and ensure that they are less than the Louisiana Toxic Air Program Ambient Air Standards for Hydrogen Cyanide.
Hydrogen Cyanide: 158,045.0 pounds