I am trying to refine some performance calculations by using pressure gauges on both sides of a circulator to more accurately determine flow. It appears that I may have NPSH on the circulator inlet, at least the 30 psi gauge does not shift the needle off "0." For example, at Speed 2: outlet pressure 8 psi, inlet pressure 0. While at Speed 1: outlet pressure 6.25, inlet pressure 1.0.
May I use the 8 psi pressure to determine flow, or does an adjustment have to be made for the (undetermined) negative pump suction head on the inlet side? I will need a vacuum gauge on the inlet to determine actual NPSH, which I do not have.
Thanks.
May I use the 8 psi pressure to determine flow, or does an adjustment have to be made for the (undetermined) negative pump suction head on the inlet side? I will need a vacuum gauge on the inlet to determine actual NPSH, which I do not have.
Thanks.