The question of npsh required by a pump /impeller design have been well covered here and will continue to be a subject of interest and study. An archive article appearing on the pumpzone site by terry henshaw is well reading.Much art as well as science still exists in this area ie cavitation...
The important point to take note of is that proper submergence of the pump impeller takes place within the pump pit. Submergence requirements for pumps vary with size of pump and also its speed of rotation. As a rough working guide -good practice dictates that for eye velocities of about 20...
Sorry for coming in late on this question -which hopefully by now has been correctly resolved.The pump suction and fluid flow entry to the eye of the impeller are vital notably in the prevention of cavitation.Centrifugal pumps have both a required npsh value [based on the pump design ,geometry...
