A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit E. to deliver water at a flow rate of 0.001 m3/s? The Fanning friction factor, f is 0.0062 ?
Correct answer: B. 11 m
- A. 10 m
- B. 11 m
- C. 11.8 m
- D. 30 m
Explanation
The static elevation head is 10 m, while friction loss is approximately 4f(L/D)(v²/2g) = 0.99 m, using v = Q/A ≈ 0.51 m/s. Thus the required pump head is about 10.99 m, or 11 m.
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