Answer Posted / mohan tayade

Cavitation

Cavitation also can cause pump vibration. It occurs when the
system's available net-positive suction head (NPSHa) is less
than the pump's requirement (NPSHr). Indications of a
cavitating pump can include noise, fluctuating flow rates, a
decrease in discharge pressure, and vibration.
Cavitation-induced vibration is caused by imploding vapor
bubbles that introduce shock waves in a pump, shortening the
life cycle of all of the pump's mechanical components. The
components that commonly fail prematurely are impellers,
wear rings, and casings. If cavitation is present, NPSHa
should be increased above NPSHr by making changes in the
system design or operation to reduce or eliminate
cavitation. Cavitation does not always produce pump
vibration, and the induced vibration often is random and
unmeasurable.

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