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|State Police #||12-07869|
|Pollutant||Duration||Point Source||Greenhouse Gas||Criteria Pollutant||Ozone forming chemical||Amount of Release|
|1,3-Butadiene||3H||OL-5 Elevated Flare (EPN 6-84)||NO||NO||YES||117.1 pounds|
|Nitrogen Oxide||3H||OL-5 Elevated Flare (EPN 6-84)||NO||YES||YES||69.5 pounds|
|Carbon Monoxide||3H||OL-5 Elevated Flare (EPN 6-84)||NO||YES||NO||378.1 pounds|
|Particulate Matter||3H||OL-5 Elevated Flare (EPN 6-84)||NO||YES||NO||13.1 pounds|
|Volatile Organic Compounds (VOCs)||3H||OL-5 Elevated Flare (EPN 6-84)||NO||NO||YES||272.3 pounds|
Accident Classified As: Reportable Quantity
Shell Chemical's OL-5 Process Unit experienced an unexpected unit upset which led to flaring at the OL-5 Elevated Flare. This process upset was caused by the production of off specification debutanizer overhead product. The off specification debutanizer overhead product was caused by temperature control issues while OL-5 operations was in the process of swapping heat exchangers.
This incident was not preventable by Shell. The fouling of the exchanger was not expected.
OL-5 Operations left both exchangers in service to regain temperature control and recover from the unit upset and stop the flaring. OL-5 Operations will return to single exchanger operation as soon as practical and clean the fouled exchanger. The cause of the exchanger fouling is attributred o the breaking off of polymer produced in the process. The polymer was believed to have been broken off and moved into the exchanger causing it to be fouled during a recent, unexpected process upset. A further investigation into the cause of this incident will be conducted and any preventative actions discovered will be implemented.