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Occupational Safety and Health Administration OSHA

Accident Report Detail

Accident: 14241210 - Employee Struck By Oil Well Choke Valve

Accident: 14241210 -- Report ID: 0627700 -- Event Date: 09/06/1984
InspectionOpen DateSICEstablishment Name
139813009/12/19841389The Western Company Of North America
EMPLOYEE #1 WAS BLEEDING THE PRESSURE OFF THE WELLHEAD THROUGH A CHOKE VALVE WHICH WAS MOUNTED ON THE WELLHEAD CONTROL (TREE). THE CHOKE VALVE WAS OPENED JUST ENOUGH TO ALLOW PRESSURE TO ESCAPE AT THE UNION, WHICH WAS DISCONNECTED FROM THE SEPARATOR LINE. EMPLOYEE #1 INSTRUCTED ANOTHER WORKER TO RAISE THE WELLHEAD PROTECTOR OUT OF THE TREE. AS THE WELLHEAD PROTECTOR CUP WAS RAISED PAST THE CHOKE VALVE, THE CHOKE VALVE ASSEMBLY WAS PRESSURIZED BY PRESSURE FROM WITHIN THE TREE. THIS PRESSURE BUILDUP CAUSED THE CHOKE VALVE TO SPIN OFF THE MOUNTING NIPPLE. IT BLEW OUTWARD OFF THE TREE AND STRUCK EMPLOYEE #1 IN THE CHEST.
Keywords: chest, high pressure, valve, oil well servicing, struck by, wellhead, pressure release
Employee # Inspection Age Sex Degree Nature Occupation
1 1398130 Fatality Fracture Occupation not reported

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