Now we will see how to enter the hydro static requirement while designing of the vessel in PV Elite software However, if the hydrostatic test pressure is allowed to exceed, either intentionally or accidentally, the value determined as prescribed in ASME Boiler and Pressure Vessel Code Section VIII DIV.1 (Rules for Construction of Pressure Vessels), UG-99 – (c) above to the degree that the vessel is subjected to visible permanent distortion, the Inspector shall reserve the right to reject the vessel.

This Division does not specify an upper limit for hydrostatic test pressure.

Above equation represent the minimum standard hydrostatic test pressure as per ASME section VIII Div.1.

The hydrostatic test pressure reading shall be adjusted to account for any static head conditions depending on the difference in elevation between the chambers being tested and the pressure gauge.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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