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Pump shaft size and driver relation
Q: What would a general rule of thumb be for pump shaft size related to driver horsepower? I have used the following rule: The minimum pump shaft diameter would be 1 in. for every 100 hp. The minimum pump shaft for a 300 hp driver would be 3 in. to avoid shaft issues. This seems to indicate when a mismatch may occur. Is there another rule of thumb to use that may be better at indicating potential pump issues?
A: I don't know of a rule of thumb for pump shaft diameter and doubt one exists as there are so many factors to be considered. Among these factors are: strength of shaft material; steps in the shaft (stress raisers); keyways and types of keyways (reduce strength); possible cyclic loading; radial/bending load; and torsional load.
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