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Derating centrifugal pump performance for low NPSHa
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...- Gadsen
- Post #7
- Forum: Pump engineering
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Derating centrifugal pump performance for low NPSHa
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...- Gadsen
- Post #5
- Forum: Pump engineering
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Derating centrifugal pump performance for low NPSHa
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...- Gadsen
- Post #3
- Forum: Pump engineering
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Derating centrifugal pump performance for low NPSHa
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...- Gadsen
- Thread
- Replies: 6
- Forum: Pump engineering
