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10 Centrifugal Pumps: Design and Application
Figure 1-8. Horsepower change with specific gravity.
normally used. For most applications, construction is determined by reli-
ability, ease of maintenance, available real estate, and operating parame-
ters. Ultimately however, it is the pump manufacturer's responsibility to
select appropriate construction.
Pump Selection
From the information supplied in the data sheet, a pump can normally
be selected from the pump manufacturer's sales book. These are nor-
mally divided into sections, each representing a particular construction.
Performance maps show the range of capacity and head available, while
individual performance curves show efficiency and NPSHR. If the pump
requirements fall within the performances shown in the sales book, the
process of selection is relatively simple. When the required pumping
conditions, however, are outside the existing range of performance, se-
lection is no longer simple and becomes the responsibility of the pump
designer.
