Final report on Tesoro refinery blast OKd

first_imgANACORTES — A final report on the 2010 Tesoro refinery explosion that killed seven employees was presented and approved by the Chemical Safety Board on Thursday night in Anacortes.The report noted that problems in the facility’s safety culture, industry standards and state and federal oversight of the industry helped lead to a catastrophic rupture of a heat exchanger at the refinery, which leaked and ignited hydrogen and naphtha, a flammable petroleum solvent.A draft report detailing investigation findings and recommendations was released by the board in January.After receiving input from the United Steelworkers, the American Petroleum Institute, the Western States Petroleum Association, American Fuel and Petrochemical Manufacturers and a list of other stakeholders in industry operations and regulation, the board made a few substantial revisions to the report in its final form.The explosion was caused by high temperature hydrogen attack, or HTHA, which severely cracked and weakened carbon steel tubing leading to a rupture, according to the report.The report found the carbon steel tubing that burst in the heat exchanger due to HTHA was estimated to be operating within the petroleum industry’s current Nelson Curve for that material.last_img read more

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