Calculate NPSHa for VS4 pumps

[Sabergg1981]

Hi All

Does NPSHa for VS4 pumps calculate as usual as OH2 pumps?

 

[bimr]

Yes, here are some condiderations:

http://www.eng-tips.com/viewthread.cfm?qid=314350

 

[Pumpsonly]

NPSHA = (absolute press above the liquid - vapour Press.)X 10 / S.G + liquid level above the impeller inlet.

 

[1gibson]

More often than not, minimum submergence will be the limiting factor, rather than NPSH.

If you plan to use a VS4 where NPSH is the limiting factor (in an application other than an open sump or a tank) then you might have the wrong pump type.