Page 370 - Centrifugal Pumps 2E

Shaft Design and Axial Thrust 335

Solving for D:

For design round up to nearest Vs-in. increment: D = 2.375.

Example

5
A 2-stage pump has been designed with a 2 /8-in. shaft diameter at
the coupling. The maximum horsepower at 3,560 RPM is 900. What is
the maximum operating speed for a limiting stress of 7,000 psi?

Solution

Using the pump affinity laws described in Chapter 2: