Topic: Fluid Mechanics and Machinery
The maximum depth from which a centrifugal pump can draw water is-
- A. Dependent on the speed N of the pump
- B. Dependent on the power of the pump
- C. Around 10 m
- D. Dependent on $N^{2}$
Answer: C. Around 10 m
Explanation: The maximum depth from which a centrifugal pump can draw water is theoretically equivalent to the atmospheric pressure head, which is around 10 m of water column. We know that $P_{atm} = \rho \times g \times h \Rightarrow 101.3 \times 10^{3} = 1000 \times 9.81 \times h \Rightarrow h \approx 10.33 m$. Practically, due to losses, it is around 10 m. This is the maximum height to which water can be raised by a suction pump.