It is desired to operate a pump at 1750 rpm by driving it with a four-pole electric motor....

It is desired to operate a pump at 1750 rpm by driving it with a four-pole electric motor. For each of the following conditions, compute the specific speed using Eq. (13–17). Then, recommend whether to use an axial pump, a mixed-flow pump, a radial-flow pump, or none of these, based on the discussion related to Fig. 13.53.

a. 500 gal/min of water at 80 ft of total head

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b. 500 gal/min of water at 800 ft of head

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c. 3500 gal/min of water at 80 ft of head

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d. 80 gal/min of water at 8000 ft of head

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e. 80 gal/min of water at 800 ft of head

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f. 8000 gal/min of water at 200 ft of head

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g. 8000 gal/min of water at 60 ft of head

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h. 8000 gal/min of water at 12 ft of head

FIGURE 13.53 Specific speed versus specific diameter for centrifugal pumps—An aid to pump selection. (Excerpted by special permission from Chemical Engineering, April 3, 1978. Copyright © 1978 by McGraw-Hill, Inc., New York)