Pumps, Fans, and Blowers 10.8 Data from tests of a water suction pump operated at 2000 rpm with a 12-in.-diameter impell

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Pumps Fans And Blowers 10 8 Data From Tests Of A Water Suction Pump Operated At 2000 Rpm With A 12 In Diameter Impell 1 (97.88 KiB) Viewed 37 times

Pumps, Fans, and Blowers 10.8 Data from tests of a water suction pump operated at 2000 rpm with a 12-in.-diameter impeller are Flow rate, Q (cfm) Total head, H (ft) Power input, P (hp) 36 190 25 50 195 30 74 176 35 88 162 40 125 120 46 Plot the performance curves for this pump; include a curve of effi- ciency versus volume flow rate. Locate the best efficiency point and specify the pump rating at this point. 10.9 Data measured during tests of a centrifugal pump driven at 3000 rpm are Parameter Outlet, Section 2 Gage pressure, p (psi) Elevation above datum, z (ft) Average speed of flow, 7 (ft/s) Inlet, Section 12.5 6.5 6.5 32.5 15 The flow rate is 65 gpm and the torque applied to the pump shaft is 4.75 lbf.ft. The pump efficiency is 75 percent, and the electric motor efficiency is 85 percent. Find (a) the electric power required and ( (b) the gage pressure at the pump outlet.