12.18 WEY The performance characteristics of a certain centrifu- gal pump having a 9-in.-diameter impeller and operating at 1750 rpm are determined using an experimental setup similar to that shown in Fig. 12.10. The following data were obtained during a series of tests in which z₂z₁ = 0, V₂ = V₁, and the fluid was water. - 21 Q (gpm) 20 40 60 80 100 120 140 P2 - P₁ (psi) 40.2 40.1 38.1 36.2 33.5 30.1 25.8 Power input (hp) 1.58 2.27 2.67 2.95 3.19 3.49 4.00 Based on these data, show or plot how the actual head rise, ha, and the pump efficiency, n, vary with the flowrate. What is the design flowrate for this pump?

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12.18 WEY The performance characteristics of a certain centrifu-
gal pump having a 9-in.-diameter impeller and operating at 1750 rpm
are determined using an experimental setup similar to that shown in
Fig. 12.10. The following data were obtained during a series of tests
in which z₂ Z₁ = 0, V₂ = V₁, and the fluid was water.
Q (gpm)
20 40 60 80 100 120 140
25.8
P2 - P₁ (psi) 40.2 40.1 38.1 36.2 33.5 30.1
Power input (hp) 1.58 2.27 2.67 2.95 3.19 3.49 4.00
Based on these data, show or plot how the actual head rise, ha, and
the pump efficiency, n, vary with the flowrate. What is the design
flowrate for this pump?
(1).
Figure 12.10
(2)
22-21
1
Transcribed Image Text:12.18 WEY The performance characteristics of a certain centrifu- gal pump having a 9-in.-diameter impeller and operating at 1750 rpm are determined using an experimental setup similar to that shown in Fig. 12.10. The following data were obtained during a series of tests in which z₂ Z₁ = 0, V₂ = V₁, and the fluid was water. Q (gpm) 20 40 60 80 100 120 140 25.8 P2 - P₁ (psi) 40.2 40.1 38.1 36.2 33.5 30.1 Power input (hp) 1.58 2.27 2.67 2.95 3.19 3.49 4.00 Based on these data, show or plot how the actual head rise, ha, and the pump efficiency, n, vary with the flowrate. What is the design flowrate for this pump? (1). Figure 12.10 (2) 22-21 1
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