| http://www.w3.org/ns/prov#value | - The method of claim 54, wherein the centrifugal pump is operatively connected in a plumbing system disposed within and including the wellbore of a well, and the method further comprises calculating the flow Q by performing steps comprising: a) determining a combined characteristic equation for the centrifugal pump operating in the system as a function of the fluid level Xc in the wellbore; b) solv
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