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… Date (Y-M-D): 1991-03-15 Subject: Pressure Vessels and Hydrostatic Testing Resulting from a recent incident, it … mm x Ø 355 mm) that failed its first periodic hydrostatic test. A small crack was found, caused by an undercut weld, at … manifested itself only at the time of the hydrostatic test. Your attention is drawn to the requirement that unfired …
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