For single stage centrifugal pump, if my rated flow is 135% higher than the normal flow; then what about my BEP and pump actual performance in the field? I am not having pump curves, we are just deciding over the flow design margin as our desing flows are 20% higher than normal, add on that we have taken more 10% margin of desing flow. is worth designing pump this way?
I am quite worried about pump performance and efficiencies!