| http://www.w3.org/ns/prov#value | - In practicing this aspect of the invention, the inventors have noted and made advantageous use of the fact that pump head pressure Hp at zero flow of the centrifugal pump 32 follows the affinity scaling law Hpz=Hr (Qp=0)(Upz/Ur)???n, where n is a value substantially in the range of 1.5 to 2.5.
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