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A centrifugal pump tested at nominal speed 1750 rpm

Mechanical Engineering

A centrifugal pump tested at nominal speed 1750 rpm. Data measured during the test are given in the following table:

Rate of flow (L/s)

Suction pressure(mm Hg)

Discharge pressure kgf/cm2

Motor current amp

0

58.61

3.73

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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