UNIT IV - BOARD PRESENTATION OF INCIDENT.pptx

UNIT IV - BOARD PRESENTATION OF INCIDENT.pptx - EXXONMOBIL...

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EXXONMOBIL REFINERY CHEMICAL RELEASE AND FIRE BRANDON DESOTO COLUMBIA SOUTHERN UNIVERSITY
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INCEDENT SUMMARY INCEDENT SUMMARY November 22, 2016, the EXXONMOBILE Refinery in Baton Rouge Louisiana, a fire erupted during maintenance activities severely burning 4 workers. The fire developed in the refinery’s sulfuric acid alkylation unit. Within that unit, isobutanes and olefins are converted into a major component of gasoline in a reaction involving sulfuric acid. ON THE DAY OF THE INCIDENT , two operators were preparing to put a spare isobutane pump into service. To do so, the operators needed to open the pumps inlet plug valve which is operated manually. A hand wheel and a piece of equipment called a gearbox were connected to the valve by a support bracket. The gearbox uses gears to makes it easier to turn the valve stem into the open or closed position. The operators turned the hand wheel on the spare pump’s inlet plug valve, but the gear box was not working properly and the valve would not open.
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SUMMARY OF INCIDENT… continued SUMMARY OF INCIDENT… continued The gear box was connected to the valve body by the support bracket using bolts. The operators removed four vertical bolts from the valve. But unknown to the operators these bolts also secured a critical pressure containing component of the valve known as the top cap. Approximately 3% of the numerous plug valves in the refinery’s alkylation unit were designed so that the gear box support bracket attached to the top cap. With this 30 plus
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  • Fall '19
  • Valve, Manual transmission, plug valve

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