Online
Store: Technical Paper - Centrifugal Air Compressors
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Description:
Problem Diagnostics on High-Speed Centrifugal Compressors Using
Vibration Signature Analysis
Part
Number CAC-1 (14 page booklet) - $39
Highlights:
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This
paper concentrates on the techniques and instrumentation required
to detect a multitude of problems experienced by today's high-speed
centrifugal air compressors.
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Such
techniques apply to compressors typically ranging in size from
approximately 1,000 to 18,000 CFM with normal discharge pressures
of about 100 to 125 psig and usually driven by electric motors
ranging from 300 to 6000 HP (occasionally turbine-driven).
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These
multi-stage compressors have impeller speeds ranging from 15,000
to 70,000 RPM or more.
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These
units are outfitted with bullgears having high tooth counts,
on the order of 250 to 500 teeth, running at nominal speeds
of 1800 to 3600 RPM.
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This
means that the fundamental gear mesh frequency most often ranges
from 850,000 to 1,500,000 CPM (or roughly 14,000 to 25,000 Hz).
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Therefore,
one must be concerned about extremely wide frequency ranges
all the way from subsynchronous motor and bullgear frequencies
up to approximately 3.5 times gear mesh frequency (or from roughly
600 to more than 4,000,000 CPM)!
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This
requires several transducers and various analyzers, along with
employment of several specialized techniques in order to fully
evaluate the "health" of this critical family of machines.
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Discussions
are included on these techniques, instruments, and programs
required to improve the reliability and to prevent costly, unanticipated
failure of these machines.
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In addition, several case histories are offered for further
amplification.
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For
more detailed information, please call Technical Associates of Charlotte,
send us an email, or use our quick & convenient Online
Request Form. |
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Associates @ 704-333-9011 |
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