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The Practical Pumping Handbook

Figure 1.1: ANSI process pump (Reproduced by permission of Flowserve Corporation)

The API pump is almost the exclusive choice for applications in the oil
refining and associated industries, where it handles higher temperatures
and pressure applications of a more aggressive nature. While API
specifications also deal with some vertical shaft models, the horizontal
style is the more widely used design.
These single stage pumps are both designed with a radially split casing
to accommodate a pullout arrangement at the back for ease of
maintenance. The major difference between the two styles is reflected
in the casing pressure design ratings, which are as follows:
ANSI Pump Rating = 300 PSIG at 300 ~ F
API Pump Rating = 750 PSIG at 500 ~ F
In view of these figures, it is apparent that the API pumps should be
considered for higher pressure and temperature services than the lighter
duty ANSI pump.

1.2 Applications

In considering the different types of liquids handled by these pumps,
the various applications are frequently classified in the following
categories:

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