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Occupational Safety and Health Administration OSHA

Accident Report Detail

Accident: 170116040 - Employee Struck And Killed By Exploding Dome Assembly

Accident: 170116040 -- Report ID: 0215600 -- Event Date: 01/22/1991
InspectionOpen DateSICEstablishment Name
10277875001/24/19913599Handy Tool
Employee #1, a shop foreman, and two coworkers were working in the production area of a small tool and manufacturing company. They were using compressed air to pressure test an aluminum dome assembly unit that was being manufactured for the Department of Defense. (The unit was approximately 20 in. in diameter; 7 in. high; and weighed approximately 10 lb.) It was secured to an aluminum base plate by 15 aluminum clips and 1-in.-long, 0.25-in. steel bolts, which were evenly spaced around the perimeter of the dome flange and inserted into threaded holes in the base plate. The base plate measured approximately 25 in. by 25 in. by 0.75 in. and weighed approximately 751 lb. The shop compressor supplied the compressed air. The line pressure was unknown; D.O.D. specifications required 75 psi. After introducing the compressed air into the unit, Employee #1 heard the hissing sound of escaping air. He leaned over the unit to run his hand around the outside perimeter and locate the air leak. At this point, 11 of the 15 clips holding the dome unit in place failed, and the dome unit exploded upward. The unit struck Employee #1 on the forehead and fractured his skull. He died several hours later in the hospital.
Keywords: hold-down clamp, fracture, pressure vessel, work rules, compressed air, equipment failure, explosion, skull, high pressure, struck by
Employee # Inspection Age Sex Degree Nature Occupation
1 102778750 Fatality Fracture Occupation not reported

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