Abstract：The formulas for mechanical,hydraulic,cubage and overall pump efficiencies are given theoretically.The pump efficiency analogies and pumping system efficiency analogies are discussed.Various formulas for converting pump efficiency are evaluated and discussed.A new conversion method for efficiency coefficient and a new pump efficiency formula are derived.The formula and methods are useful to differentiate and evaluate the reliability of the pump characteristics and are instructional for developing new high efficient pumps.The formula derived from the centrifugal pump(the volute casing mixed flow pump) and the vertical axial flow pump(the vertical mixed flow pump) are also applicable to the pump system,of any size and any other parameters.The study gives a universal formula for the design of pumps and pump systems.
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