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|Pollutant||Duration||Point Source||Greenhouse Gas||Criteria Pollutant||Ozone forming chemical||Amount of Release|
|Volatile Organic Compounds (VOCs)||7h 30m||Tank 15||NO||NO||YES||200.0 pounds|
Accident Classified As: Below Reportable Quantity (BRQ)
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.
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.