How Does Specific Gravity Impact NPSH in Centrifugal Pumps?

[WesTech]

Head psa(suction surface pressure) = 2.31xP/specific gravity

This is one of the factors to calc NPSH. Shows how much head is pushing liquid through the pump.

What does the specific gravity have to do with surface pressure of a liquid before it goes into the pump? Isn't it just involving the atmospheric pressure pushing on the liquid?

 

[Nidum]

This question is about centrifugal pumps and Net Positive Suction Head at the inlet ?

A value of NPSH above a critical minimum is needed to ensure that the pump can draw in fluid effectively and not have problems with inlet cavitation .

See if these help :

http://www.pumpschool.com/applications/NPSH.pdf
http://www.engineeringtoolbox.com/npsh-net-positive-suction-head-d_634.html

If not then please come back .