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11 February, 15:13

g A pump is required to deliver 100 gpm at a head of 100 ft, but the pump rated capacity is 150 gpm at a head of 100 ft. If the pump speed is constant, what will be the effect of valving the pump discharge to reduce flow

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  1. 11 February, 15:56
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    Answer: valving the pump discharge to reduce the flow will only result in an increase in the water velocity according to the laws of continuity of flow.

    Q = AV = constant.

    The pump speed of 150 gpm is, and will remain constant. Valving simply reduces flow area A, which is balanced out by increased velocity V of water through the pipe.

    This does not affect the pump speed Q (flow rate) and hence it remains the same.
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