2. The characteristics of two centrifugal pumps at constant speed are as follows: Q(m3/s) 0.0 006 0.012 0.018 0.024 0.030 0.036 Pump A H(m) 22.6 21.9 20.3 17.7 14.2 9.7 3.9 n(%) 32 74 86 85 66 28 Pump BH ( m) 1 6.2 13.6 1 1.9 11.6 10.7 9.0 6.4 n(%) 14 34 60 80 80 60 A pumps is required to lift water continuously through 3.2 m of vertical lift and the pipe to be used is 21 m long, 10 cm diameter and friction coefficient is 0.005. Select the more suitable pump between pump A and B for this duty and justify your selection. What power input will be required by the selected pump?

2. The characteristics of two centrifugal pumps at constant speed are as follows: Q(m3/s) 0.0 006 0.012 0.018 0.024 0.030 0.036 Pump A H(m) 22.6 21.9 20.3 17.7 14.2 9.7 3.9 n(%) 32 74 86 85 66 28 Pump BH ( m) 1 6.2 13.6 1 1.9 11.6 10.7 9.0 6.4 n(%) 14 34 60 80 80 60 A pumps is required to lift water continuously through 3.2 m of vertical lift and the pipe to be used is 21 m long, 10 cm diameter and friction coefficient is 0.005. Select the more suitable pump between pump A and B for this duty and justify your selection. What power input will be required by the selected pump?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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For the model pump below (impeller size: 37.1 cm; shaft speed: 2133.5 rpm), if it is operated to achieve a pump efficiency of 60% at a discharge within the range between 0 and 0.25 m³/s, using a shaft speed of 1800 rpm instead, what will most approximately be the power coefficient? Assume water density 1000 kg/m³. 250 Head, m; power, kW 200 150 100 000 0 50 O 0.69 O 0.73 O 0.88 O 0.52 Efficiency 0.05 Head (AH), m N=2133.5 rpm = 35.6 rps D = 37.1 cm 0.15 Discharge, m³/s 0.10 Power input, kW 0.20 0.25 100 80 60 40 20 0
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