Re: pump suction-cavitation

From: <Gang>
Date: Sat May 18 2002 - 02:25:00 EDT

Dear Srinivas,

Any text book on hydraulics will discuss the phenomenon of cavitaion.

It is basically a problem at centrifugal pump suction region ( more at the eye of the impeller )on account of the vapour trapped / formed. The vapour separated from the pumped fluid occurs at the lowest pressure zone. The nascent bubbles impinge / break at the metal surface of the impeller ( eye ) causing severe pitting resulting in loss of material. If allowed to continue for long time it results in imbalance of the shaft dynamics and causes vibration problems and subsequently failure of the pump. Installation of an eccentric reducer FSB causes vapour pocket to be permanent at the suction nozzle. This aggravates the otherwise potent problem of cavitation. The only precaution to ward off this monster is to have a good cushion / margin of ( NPSH available minus NPSHrequired ) NPSHr will be furnished by the pump vendor.

I suggest you read further about this in some standard text-book / hand-book on hydraulics.

Good luck!!!
C. V. Gangadharan.
--- Musthi_S_Srinivas@ril.com wrote:
> To avoid cavitation the eccentric reducer at pump
> suction nozzle is kept
> flat up.
> can you brief me how cavitation occurs if the
> reducer is kept flat down.
>
>
> regards
> srinivas
>
>
>
>
>
>
>

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