CENTRIFUGAL PUMPSFluid Flowwhere:n = speed of pump impeller (rpm)= volumetric flow rate of pump (gpm or ft3/hr)VHp = head developed by pump (psid or feet)p = pump power (kW)Using these proportionalities, it is possible to develop equations relating the condition at onespeed to those at a different speed.(3-23)V1n2n1V2(3-24)Hp1n2n12Hp2(3-25)p1n2n13p2Example: Pump LawsA cooling water pump is operating at a speed of 1800 rpm. Its flow rate is 400 gpm ata head of 48 ft. The power of the pump is 45 kW. Determine the pump flow rate, head,and power requirements if the pump speed is increased to 3600 rpm.Solution:Flow rateV2V1n2n1(400 gpm)3600 rpm1800 rpm800 gpmHT-03 Page 50 Rev. 0
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