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|State Police #||11-02206|
|Pollutant||Duration||Point Source||Greenhouse Gas||Criteria Pollutant||Ozone forming chemical||Amount of Release|
|Sulfur Dioxide||3h 4m||Sulfur Unit (SRU-4); TGTU No 4||NO||YES||NO||1,467.0 pounds|
Accident Classified As: Reportable Quantity
State police report states that an unplanned shutdown occurred due to an upset in the sulfur unit, causing a release in sulfur dioxide. The incident originated with the unit re-start of the Fluid Catalytic Cracking Unit (FCCU) which then affected the processes of the Amine Recovery Unit (ARU).
Motiva's Upset Notification Form states that the incident was a result of lighter than usual (gasoline range) material getting into the process vessels. The lighter material caused the level instrumentation to read incorrectly in a false indication that levels were acceptable.
Operations modified the start-up procedure to better diagnose a buildup of backpressure from downstream.