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Re: pump cavitation

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Posted by jim on October 06, 2006 at 12:14:57:

In Reply to: pump cavitation posted by joey on September 30, 2006 at 02:41:16:

: Our two feedwater pumps cavitate and make gurgling noises and the such on one of our Deaerators. Also the discharge pressures bounce up and down from 170psi to 220psi. What should my pump pressures be? The temperature of this tank reads from 218F to 230F. Isn't this too high of a feedwater temperature? Are the pumps steambound? Boiler is a 200hp S'toon firetube with operating pressure of 110psi. Our other boiler and pumps do not make these noises comiing from the other D.A. That tank reads 180F all the time. Should we adjust the steam into D.A.#1 to bring down temperature? Everyone here just disregards this and goes on about it like the noise will go away. Again, I'm new to this plant and still trying to figure this quirky place out.
: Any comments would be appreciated. Thanks everyone.
: JF

Pump discharge should be 30 or so psi above highest safety valve setting.
Is your feed pump recirc aligned and is your recirc oriface sized correctly?
IS your suction strainer plugged?
Is your da level and pressure stable?
Is anything flashing or quenching your da tank?
Is your boiler feed control valve hunting?
Dont lower your da temp.

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