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Marathon Ashland Petroleum (3165), Garyville

Releases of 1-Pentene

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

kerosene hydrotreater unit
Cause: 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.

Followup: Yes

Notes: the line was isolated, and the valve was closed.
0.5 pounds

exchanger 05-1313
Cause: Pinhole leak from exchanger, 05-1313, caused a release of naphtha to the coker unit pad.

Followup: Yes

Notes: the exchanger was isolated, and contents were directed to the oily water sewer.
2.5 pounds

Platformer Debutanizer Trim Cooler, #1 Cooling Tower EQI: 61a-74
Cause: A high LEL was found at the #1 cooling tower, operations started checking for leaks and found that the debutanizer overhead trim cooler, 12-1309, was leaking hydrocarbons into the cooling water. Leak caused by under deposit corrosion.

Followup: Yes

Notes: The debutanizer trim cooler was isolated and leaking tubing plugged.
54.0 pounds

Emissions from Flare
emissions from flare and Unit 45 Thermal Oxidizer
Cause: Marathon experienced a partial power outage caused by a malfunctioning substation in the refinery resulted in multiple pieces of equipment in the refinery losing power. Low pressure stripper Offgas flared in the South Flare due to partial power outage. Enterprise incident due to a plant farther downstream that had uncharacteristically ceased operation due to an upset condition. The pressure safety valve, as designed, released discharging natural gas to atmosphere due to high pressure on the pipeline caused by the upset condition farther down the line. Emission points involved were the Unit 59 North Flare and the Unit 45 Thermal Oxidizer.

Followup: No

Notes: Marathon power was restored and the equipment that was shutdown was restarted to minimize further releases. An incident investigation will result in recommendation items designed to prevent the recurrence of this event. High sulfur dioxide from one of the thermal oxidizer stacks in Unit 45 and in addition to a small amount of Unit 15 low pressure stripper offgas was flared which contains a small amount of hydrogen sulfide which is converted to sulfur dioxide in the North Flare. Emission points involved were the Unit 59 North Flare and the Unit 45 Thermal Oxidizer. Enterprise personnel immediately began the process of taking the plant down in order to end the release event. Amount of natural gas released is above reportable quantity.
0.2 pounds

RBS Flare
Cause: False reading on the 66LT0511 level controller caused the two NC4 compressors to trip. The high pressure on the receiver, due to high liquid level, caused the 66PC0507 valve on the receiver to open the RBS flare. Approximately 6.67 lbs of VOCs were released as a result.

Followup: No

Notes: The operator blew down transmitter 66LT0511 and opened the bypass valve on the receiver to send the liquid back to the RBS tank. The faulty level transmitter was taken out of service and repaired.