If the pump having the characteristics shown in Problem 14.14 is tripledin size but halved...

If the pump having the characteristics shown in Problem 14.14 is tripledin size but halved in rotational speed, what will be the discharge rate and head when operating at maximum efficiency?

Problem 14.14

Performance curves for an operating centrifugal pump are shown below in both conventional units and in dimension-less form. The pump is used to pump water at maximum efficiency at a head of 90 m. Determine, at these new conditions, (a) the pump speed required and (b) the rate of discharge.