cast_iron_tee - On the 29th of December 1999 a component of...

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On the 29 th of December, 1999, a component of a dry pipe fire sprinkler circuit failed, releasing several thousand gallons of water into one of the living areas of an assisted living community. The system had been pressurized on 12/26/99 The system had been pressure tested at 200 psi for 2 hours in September of 1999.
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3/4x3/4x1/2 reducing “tee” 3/4x3/4x1/2 reducing “tee” Fracture origin located in area of smallest wall thickness of the casting mounted specimen prepared by EFI for metallurgical analysis
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origin Another perspective of fractured fitting Note that nearly half the fitting has been lost
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Note change in orientation of the fracture surface with respect to the longitudinal axis of the fitting Cracks always propagate in directions perpendicular to a tensile stress metallurgical specimen
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Specimen containing origin of the fracture – Note location of origin and texture of casting walls and fracture surface
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brittle fracture of casting
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cast_iron_tee - On the 29th of December 1999 a component of...

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