The similarity rules for centrifugal pumps dictate that homologous operating points of a certain pumps (changing velocity) have same efficiency. Starting at BEP of a pump runing, say, 1750 rpm (max. efficiency = 80%), the similarity rules predict that there must be an homologous operating point at lower velocity, say, 1500 rpm with the same max. efficiency = 80%. But practice indicates that at lower velocity the max. efficiency is also lower, then 80% eff. is no possible al 1500 rpm. Theory fails?
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