Actually I now have the problem solved. It was primarily political. I now have them, with your help, conviced that there is no other answer than to core through the wall and the back of the water fall/cooling tower in order to improve the suction side of the situation.
As it exists now I have...
scalleke,
The one thing I had not considered was turning out the impeller eye.
The existing eye diameter is 2.293". If I leave .030 (per side) for material integrity (SWAG), I could increase the eye diameter to a max of 2.550.
Do you have a method for predicting the performance change, or is...
Thank You rmw. I had already implemented all of your suggestions that were applicable, but was hoping for a magic bullet, which I probably really knew didn't exist. I've been handed a mess here (which they want to expand!), guess it's just time to recommend the drastic changes I've been trying...
Does anyone have a formula or method for predicting the performance for a single stage centrifugal pump based on lower than required NPSH?
I would like to be able to re-draw a pump curve based on the difference between the NPSHr denoted on a pump curve vs. the NPSHa I have in the real world...
