how to resolve cavitation problem
how to resolve cavitation problem
(OP)
I suppose that I have cavitation problem in the miltistage horozontal pump i want to know how to eliminate this cavitation and how to improve the performance for this pump
thank you for your help.
thank you for your help.





RE: how to resolve cavitation problem
Is this a new installation or has it always been a problem in an existing installation.
The usual cause of cavitation is insufficient NPSHa which can be from a multitude of reasons.
You will need to supply a lot more detail to get to the cause of the problem.
RE: how to resolve cavitation problem
Cavitation and the Centrifugal Pump by Griist is a classic text worth investing in.
RE: how to resolve cavitation problem
'Supposing' you have a cavitation problem indicates you are not entirely sure of what cavitation is to be begin with.
RE: how to resolve cavitation problem
1) Determine if you actually have cavitation (dont assume)
2) Calculate your NPSHa
3) Compare to your NPSHr
4) If this agrees with your theory about cavitation then look for high losses in the suction line, elevation changes and the like.
There are no magical tricks here and the bottom line may be that you have a poor design here.
Best regards
Morten
RE: how to resolve cavitation problem
RE: how to resolve cavitation problem
"Why don't you knock it off with them negative waves? Why don't you dig how beautiful it is out here? Why don't you say something righteous and hopeful for a change?" Oddball, "Kelly's Heros" 1970
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RE: how to resolve cavitation problem
If the level is close to the maximum and pump is still cavitating - you probably bought a wrong pump or there IS a gravel in the pump.
Good luck.
RE: how to resolve cavitation problem
RE: how to resolve cavitation problem
Inadequate NPSHa is the most common culprit. The NPSHr published by the manufacturer is when the pump is brand new. If the pump is older, it will actually have a higher NPSHr due to wear on the pump seals.
Are you dealing with an open or closed system? If your system is closed, then you have some sort of leak, or the air was not vented properly at start up. Is there an air separator and air vents installed? Are they working correctly?
If your system is open, then check out the NPSH situation. Is there some connectivity in the piping system that is short circuiting the NPSHa? This could be in the form of a cooling tower bypass line connected to a low point in the return piping to the pump suction (for example).
Many details must be known about the system as a whole in order to diagnose the problem...
RE: how to resolve cavitation problem