A pump operating at 1750 rpm delivers 1 m3/s of water via a pipeline of 100 cm d

Question

A pump operating at 1750 rpm delivers 1 m3/s of water via a pipeline of 100 cm diameter. If the entrance loss coefficient is 0.1 and the bend loss coefficient is 0.20, calculate the net positive suction head. The pump is located 10 m above the reservoir water level. Assume vapour pressure is 17.54mmHg and neglect friction loss. The reservoir is opened to the atmosphere. (10 marks) A pump has the characteristics curve shown in the following figures. If the pump is operating under 80 m head and speed of 2000 rpm. Calculate the discharge the pump can deliver. Determine power requirement for the operation of the pump in the given conditions. What type of pump should be used to pump water at a rate of 0.4 m3/s and under head of 70m? Assume N = 1100 rpm. (10 marks)

Explanation / Answer

Answer

486 N/m2
165 N/m2

192 N
45 N

1.27 Pa
1.40 Pa

217 mm-Hg

6.15 N/m2
13 m

1.72 N/m2

0.66 kg/m3

3146 N
2457 N

4640 N
2320 N

9.4 m/s

83 m/s

0.53 atm

634 m3/s

2212 N

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