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Calculate the maximum pressure drop that can be allowed to
occur across a control valve, so that we can prevent
cavitation / flashing from occurring. Use the following
formula:
Δ P allow = Km (P1 – PvapourA)
where,
Δ P allow - the maximum allowable differential pressure for
sizing purposes, or terminal pressure drop;
Km- the valve recovery coefficient from the manufacturer’s
catalogue;
P1 - absolute inlet fluid pressure;
PvapourA - absolute fluid vapour pressure at the inlet
temperature;
Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g),
PvapourA = 4 kPa, KM = 0.72
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