Quote:
Originally posted by Skulemate
One other thing. If the pressure at the intake were negative, then the flowrate would be less than I predicted since the pump is using some of its head to lift the water to the intake. The flowrate from the pump would only be greater than I determined from the H-Q curve if the pressure at the intake head was positive (i.e. if the intake pressure is 1 psi, and the pressure at the pump discharge is 8.5 psi, the pump only imparted 7.5 psi to the water, not 8.5).
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Actually, I meant that the pump is taking a negative pressure (say -1.0 psi) and outputting 8.5psi, which translates into a 9.5 psi pressure increase through the pump, so yes you're right, it means less flow.
I've got to find who measured that...