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The allowable net positive suction head (NPSH) for a pump provided by the manufacturer for a flow of 0.05 m3 /s is 3.3m. The temperature of water is 30°C (vapour pressure head absolute = 0.44 m), atmospheric pressure is 100 kPa absolute and the head loss from the reservoir to pump is 0.3 N-m/N. The maximum height of the pump above the suction reservoir is
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- 10.19 m
- 6.89 m
- 6.15 m
- 2.86 m
Correct Option: C
| Head loss , hL = 0.3 | = 0.3 m of water | |
| N |
NPSH = Hatm – Hv – hs – hL
| 3.3 = | - 0.44 - hs - 0.3 | |
| 1000 × 9.81 |
⇒ hs = 6.15 m
