Page 376 - Centrifugal Pumps 2E
P. 376
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).