Multiple choice

The allowable net positive suction head (NPSH) for a pump provided by the manufacturer for a flow of 0.05 m3/s is 3.3 m. The temperature of water is 30oC (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

  1. 10.19 m

  2. 6.89 m

  3. 6.15 m

  4. 2.86 m
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

NPSH_available = (Patm - Pvap)/gamma - Hs - Hf. 3.3 = (100 - 0.44*9.81)/9.81 - Hs - 0.3. Solving for Hs gives 6.15 m.

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