when pump is maitaind throughly and installed perfectly then why pump vibrates

when pump is maitaind throughly and installed perfectly
then why pump vibrates on above standard vibration level?

Question Posted / rajiv kumar

4 Answers
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when pump is maitaind throughly and installed perfectly then why pump vibrates on above standard v..

Answer / 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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when pump is maitaind throughly and installed perfectly then why pump vibrates on above standard v..

Answer / umesh parmar

Please check operating conditions,It shall be as per
Manufacturer's catalouge.

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1 Yes

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when pump is maitaind throughly and installed perfectly then why pump vibrates on above standard v..

Answer / dinesh

when it runs with out any liquid to pump

Is This Answer Correct ?

5 Yes

6 No

when pump is maitaind throughly and installed perfectly then why pump vibrates on above standard v..

Answer / jimit shah

wen there is more than 80% load on the pump

Is This Answer Correct ?

1 Yes

6 No

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