Hydraulics and Fluid Mechanics in ME
Cavitation will begin when

pressure is increased
pressure becomes more than critical pressure
flow is increased
the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid

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Hydraulics and Fluid Mechanics in ME
Manometric head, in case of a centrifugal pump, is equal to

Work-done per kN of water Losses within the impeller
Energy per kN at outlet of impeller Energy per kN at inlet of impeller
Suction lift + Loss of head in suction pipe due to friction + Delivery lift + Loss of head in delivery pipe due to friction + Velocity head in the delivery pipe
All of these

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