It would end up using more power than using pumps with a more suitable curve, but could you use a recirculation loop to allow the pump to move more water and slide down the curve to a point where you have a large enough pressure differential between the operating point and the flat part of the curve to allow your high head shutoff?

I'm curious, why did the rebuild change the curve to create this situation? Was this a rebuild to allow the pumps to be retasked and reused?  It just seems like a pump rebuild shouldn't take pumps that operate at acceptable points on their curves and flatten the curves so they ride the curve in undesirable places.

Is starting over with more suitable pumps possible?  I'm pretty sure I know the answer, but I had to ask!  Screw pumps

2011-06-29

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