A centrifugal pump tested at nominal speed 1750 rpm. Data measured during the test are given in the following table: Rate of flow Suction Motor current Discharge pressure kgf/cm2 3.73 (L/s) pressure(mm Hg) amp 58.61 18 31.5 37.93 3.39 26.2 50.5 6.9 2.98 31 63 -22.56 2.61 33.9 69.5 -39.11 2.34 35.2 75.7 -58.76 1.99 36.3 88 -100.1 1.14 38 94.6 -124.4 0.6 39 The diameters of the suction and delivery pipes are 15 cm. The motor is supplied at 460 volt, 3 phase and has a power factor of 0.875 and has a constant efficiency of 90%. A) Calculate by hand the net head delivered and the efficiency of the pump at flow rate of 63 L/s. B) Use excel sheet and its formula to solve the equations and plot the pump head, power input, and efficiency versus the pump flow rate.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
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A) Calculate by hand the net head delivered and the efficiency of the
pump at flow rate of 63 L/s. B) Use excel sheet and its formula to solve the
equations and plot the pump head, power input, and efficiency versus the pump
flow rate

A centrifugal pump tested at nominal speed 1750 rpm. Data measured during the
test are given in the following table:
Rate of flow
Suction
Discharge
pressure kgf/cm2
3.73
Motor current
(L/s)
pressure(mm Hg)
amp
58.61
18
31.5
37.93
3.39
26.2
50.5
6.9
2.98
31
63
-22.56
2.61
33.9
69.5
-39.11
2.34
35.2
75.7
-58.76
1.99
36.3
88
-100.1
1.14
38
94.6
-124.4
0.6
39
The diameters of the suction and delivery pipes are 15 cm. The motor is supplied
at 460 volt, 3 phase and has a power factor of 0.875 and has a constant efficiency
of 90%. A) Calculate by hand the net head delivered and the efficiency of the
pump at flow rate of 63 L/s. B) Use excel sheet and its formula to solve the
equations and plot the pump head, power input, and efficiency versus the pump
flow rate.
Transcribed Image Text:A centrifugal pump tested at nominal speed 1750 rpm. Data measured during the test are given in the following table: Rate of flow Suction Discharge pressure kgf/cm2 3.73 Motor current (L/s) pressure(mm Hg) amp 58.61 18 31.5 37.93 3.39 26.2 50.5 6.9 2.98 31 63 -22.56 2.61 33.9 69.5 -39.11 2.34 35.2 75.7 -58.76 1.99 36.3 88 -100.1 1.14 38 94.6 -124.4 0.6 39 The diameters of the suction and delivery pipes are 15 cm. The motor is supplied at 460 volt, 3 phase and has a power factor of 0.875 and has a constant efficiency of 90%. A) Calculate by hand the net head delivered and the efficiency of the pump at flow rate of 63 L/s. B) Use excel sheet and its formula to solve the equations and plot the pump head, power input, and efficiency versus the pump flow rate.
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