CENTRIFUGAL PUMPS Fluid FlowSummaryThe main points from this chapter are summarized below.Centrifugal Pumps Summary• Net positive suction head is the difference between the pump suctionpressure and the saturation pressure for the fluid.• Cavitation is the formation and subsequent collapse of vapor bubbles on theimpeller of a pump as the local pressure falls below and then rises abovethe saturation pressure of the fluid being pumped.• The pump laws can be used to determine the effect of varying the speed ofa centrifugal pump on the flow, head, and power.V_{1}n_{2}n_{1}V_{2}H_{p}1n_{2}n_{1}2H_{p}2p_{1}n_{2}n_{1}3p_{2}• The combined pump curve for two centrifugal pumps in parallel can bedetermined by adding the individual flows for any given head.• The combined pump curve for two centrifugal pumps in series can bedetermined by adding the individual heads for any given flow.• The operating point (head and flow) of a system can be determined byplotting the pump curve and the system head loss curve on the same axes.The system will operate at the intersection of the two curves.HT-03 Page 56 Rev. 0

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