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A white cast iron water-line plug in a fire sprinkler systems split during leak repair. Examination revealed no material flaws, fatigue, or excessive corrosion. The plug head exhibited signs of excessive loads used in attempts to force the plug farther into the pipe. The evidence obtained indicated that the failure resulted from human error.

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David O. Leeser, 1992. "Failure of a High-Pressure Water-Line Plug in a Fire Sprinkler System", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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