The discharge of a single suction centrifugal pump operating against a total head of 12 m is 50 L s⁻¹. If the pump is directly connected to a motor operating at 1440 rpm, the specific speed of the pump will be_______.
Official Answer Key:
49 to 50
Step-by-Step Solution & Explanation
Specific speed (metric, single-suction): N_s = N√Q / H^0.75, with N in rpm, Q in m³/s, H in m.
N = 1440 rpm, Q = 0.05 m³/s, H = 12 m.
√Q = √0.05 = 0.2236; H^0.75 = 12^0.75 = 6.448.
N_s = 1440 × 0.2236 / 6.448 = 322.0/6.448 = 49.9, within the accepted range.
Section 6
Evaporation and Drying
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