Page 42 - Centrifugal Pumps 2E
P. 42
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Impeller
Design
In this chapter detailed information for designing a centrifugal pump
impeller will be presented. This information will apply to a new design
where a model in the same specific speed is not available. The design
factors shown are based on a theoretical approach and many years of col-
lecting thousands of performance tests in various specific speeds.
The following example, will demonstrate the procedure necessary to
design and layout a new impeller.
Example
The requirements for a new pump are shown on curve Figure 3-1,
which at Best Efficiency Point (BEP) is:
2,100 GPM—450 ft-3,600 RPM-Liquid—Water
Step 1: Calculate pump specific speed.
