Page 123 - Root Cause Failure Analysis
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Fans, Blowers, and Fluidizers 111
operate between their first and second critical speeds. In this instance, any change up
or down may cause the speed to coincide with one of the critical speeds.
BLOWERS
A blower uses mating helical lobes or screws and is utilized for the same purpose as a
fan. These are normally moderate- to high-pressure devices. Blowers are almost iden-
tical both physically and functionally to positive-displacement compressors. There-
fore, compressor information found in Chapter 4 on basic design criteria, physical
laws, and operating characteristics applies to blowers as well.
FLUIDIZERS
Fluidizers are identical to single-stage, screw-type compressors or blowers. They are
designed to provide moderate- to high-pressure transfer of nonabrasive, dry materials.
