Bigben, I think you misunderstood. I said that the only thing you need to measure is flow rate if you have a good Q-H curve for your pump. If that's the case, you can read pressure drop (in terms of psi or feet) directly from your graph for the measured flow rate, and you have all the terms required for the calculation.
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Michael E. Robbins
M.A.Sc. Candidate, University of Toronto
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