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Placid Refining (2366), Port Allen

Causal Factor: Process Upset

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

Cause: planned flaring during start up of an unit.

Followup: No



Cause: Water from the farm tank reached the crude unit, that result in flaring of preflash gas.

Followup: Yes

Notes: No Information Given


Sulfur plants #2 and #3
Cause: Sulfur Plant No. 2 Shutdown causing the No. 1 Incinerator to exceed the CEMS 500 ppm sulfur dioxide span until all of the acid gas load was shifted to Sulfur Plant No. 3. The increased load cause the No. 2 Incinerator to exceed the CEMS 500 ppm sulfur dioxide span until Sulfur Plant No. 2 was restarted. Both of the incinerators are permitted sources.

Followup: No

Notes: Restarted Sulfur Plant No. 2.
Sulfur Dioxide: 134.0 pounds
Hydrogen Sulfide: 5.3 pounds

Cause: Reformer Compressor shutdown due to electric failure.

Followup: No

Notes: Process upset was routed to the flare for release control. Operations safely shutdown the reformer unit and switched downstream unit to pipeline hydrogen.


FLARE: Tailgas treater unit
Cause: The tailgas treater unit from SRU2 was bypassed due to plugging in quench tower servicing #1TGTU.

Followup: No

Notes: They swept the catalyst bed with sweet gas and washed the quench tower with fresh water. "Malfunction was corrected" No offsite monitoring, no onsite monitoring, not able to determine if offsite was impacted but they note air dispersion.
Sulfur Dioxide: 3,696.0 pounds

Cause: The main air blower tripped in the FCC unit. Because the feed was pulled from the unit there was potential for a release.

Followup: No

Notes: They were bringing the unit back up and waiting for stabilization.


Tank 15
Cause: The temperature in Tank 15, which stores Heavy Slurry/No. 6 fuel oil, increased to nearly 220 degrees Fahrenheit, which increased the pressure inside the tank, overwhelming the vapor control line and causing the pressure relief device to open resulting in uncontrolled emissions.

Followup: No

Notes: On November 17, 2012 at 7:15 Placid's terminal operators discovered the vacuum breaker relieving from the tank. TANK 15 is controlled by the facilities enclosed vapor combustor (Source ID 1-91) during normal operations therefore no emissions are authorized directly from the Source. In the report, they classify this as a single point of contact incident. Tank 15 steam coils, which are used to keep its heavy contents from becoming solid, were removed from service and additional adjustments were made to cool the product rundown in the operating unit to decrease Tank 15 temperature. 7.5 hours later, the breaker closed and the venting stopped.
Volatile Organic Compounds (VOCs): 200.0 pounds

Amines process unit
Cause: A process unit upset caused liquid carryover to the amine treatment unit reducing the H2S scrubbing capacity and a valve was inadvertently left open allowing untreated fuel gas (high H2S) gas to mix with the refinery's fuel gas system.

Followup: No

Notes: The valve was closed and fresh amine was added to restore treatment capacity
Sulfur Dioxide: 3,959.8 pounds

Sulfur Recovery Unit
Cause: The Sulfur Recovery Unit process was upset. Subsequent downwind readings were executed to measure ambient air , but no values were recorded. Placid calculated the excess emissions that occurred during the #3 Sulfur Plant startup and confirmed they were less than the established reportable quantity.