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|State Police #||05-06744|
|Pollutant||Duration||Point Source||Greenhouse Gas||Criteria Pollutant||Ozone forming chemical||Amount of Release|
|Hydrogen||5 h 0 m||Hydrotreating Unit #2||NO||NO||NO||5,910.0 pounds|
Accident Classified As: Reportable Quantity
The tubing failed due to its susceptibility to Chloride cracking. The combination of Chlorides, H2O, stress, and stainless steel tubing created a condition that allowed stress corrosion cracking to occur in the Inside Diameter (ID).
The immediate air was evacuated, as IES and Motiva's emergency response staff responded to the incident. Air monitoring detected no off site impact. Release was stopped via water suppression and installation of valves at each release point. Motiva will verify that the material to replace the tubing is appropriate in resistance to stress, H2O and Chloride cracking. Will determine the presence of the tubing on HTU-2 documenting the items for replacement. Will establish a risk assessment criteria to identify and replace tubing that is high risk for ID initiated stress and corrosion cracking. Follow-up report: reported relese did exceed the 1,000 pound RQ for flammable gas