Page 376 - Centrifugal Pumps 2E
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Shaft Design and Axial Thrust   341

        bushing. The deflection calculated by this formula is conservative and
        should be used for relative comparisons; the actual value will be less.
          The calculation of shaft deflection for a horizontal multi-stage pump is
        complicated by the fact that the distributed weight of the shaft as well as
        the concentrated weight of the impellers must be accounted for. A
        method of approximating the shaft deflection can be found in Stepanoff.


        Key Stress

          A simple but important part of shaft design is calculating key stress. In
        most centrifugal pumps, driver torque is transmitted across the major











































        Figure 16-3. Single-stage overhung pump (courtesy BW/IP international, inc.
                                                    1
        Pump Division, manufacturer of Byron Jackson/United " Pumps).
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