![]() ![]() The MAWP (Maximum Allowable Working Pressure) may be assumed to be the same as the design pressure when calculation are not made to determine the MAWP (Maximum Allowable Working Pressure). If end client or the equipment owner does not specify the MAWP (Maximum Allowable Working Pressure) as the design criteria then we may select the UG-99 (b) (36) – endnote (36) i.e.LSR= (material stress at its operating temperature)/(material stress at its design temperature) Hydro test Pressure = 1.3 x Design Pressure x LSR. Hydrostatic test pressure at every point in the vessel is at least equal to 1.3 times the maximum allowable working pressure multiplied by the lowest stress ratio (LSR) for the materials of which the vessel is constructed.all NDT tests) have to be performed, except those required after the hydro-test. ![]() Before hydro test all operations must be completed as no one can alter equipment thicknesses once hydro test is done.Requirements as per ASME Boiler and Pressure Vessel Code Section VIII DIV.1 (Rules for Construction of Pressure Vessels), UG-99 – For hydro test as per ASME code manufacturer of the equipment must follow ASME Boiler and Pressure Vessel Code Section VIII DIV.1 ( Rules for Construction of Pressure Vessels), UG-99. We will discuss hydro test requirement in this discussion. ![]()
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