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|State Police #||13-05644|
|Pollutant||Duration||Point Source||Greenhouse Gas||Criteria Pollutant||Ozone forming chemical||Amount of Release|
|Carbon Monoxide||2d 12h 38m||OL-5 Ground (EPN 7-84) and Elevated (EPN 6-84)||NO||YES||NO||50,885.5 pounds|
|Nitrogen Oxide||2d 12h 38m||OL-5 Ground (EPN 7-84) and Elevated (EPN 6-84)||NO||YES||YES||9,351.9 pounds|
|Particulate Matter||2d 12h 38m||OL-5 Ground (EPN 7-84) and Elevated (EPN 6-84)||NO||YES||NO||1,760.4 pounds|
|Volatile Organic Compounds (VOCs)||2d 12h 38m||OL-5 Ground (EPN 7-84) and Elevated (EPN 6-84)||NO||NO||YES||25,921.6 pounds|
|1,3-Butadiene||2d 12h 38m||OL-5 Ground (EPN 7-84) and Elevated (EPN 6-84)||NO||NO||YES||913.3 pounds|
|Benzene||2d 12h 38m||OL-5 Ground (EPN 7-84) and Elevated (EPN 6-84)||NO||NO||YES||8.9 pounds|
Accident Classified As: Reportable Quantity
On December 18, 2013, Shell Chemical's OL-5 Unit shut down to complete scheduled maintenance. While walking out the unit, a pressure equipment inspector found a section of piping that was experiencing corrosion under insulation. After further investigation, a plan was devised to shut down the unit in order to repair this thinned section of piping and prevent additional unit upset conditions. Flaring to OL-5 Ground Flare (EPN 7-84) and OL-5 Elevated Flare (EPN 6-84) resulted from a unit shutdown to complete planned maintenance on a section of piping downstream of the ethylene refrigerant compressor experiencing corrosion.
It was uncertain this section of thin piping would be found during inspection.
To minimize additional unit upset conditions and impacts, the OL5 unit was shutdown and the thin wall piping was repaired. A review of the corrosion under insulation will be performed to identify improvements which can be made to prevent future re-occurrences.