fluid velocity requirements,based on the vpour pressure

In general,the damaging effects of cavitation are a typical signal that fluid velocities are not being controlled.High fluid velocity and insufficient staging will result in interstage cavitation damage,reducing the effectiveness of the valve as a flow modulating device and exposing the trim to damage,whiche lead to a leaking valve.fluid vlocity requirements based on the vapor pressure(at design temperature),is governed by the following equation: V=sqrt(1000*(P2-Pv)/gravity).

continuous service single phase fluid : 30m/s

cavitation & multi-phase fluid :23m/s

Vibration-sensitive systems :12m/s