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ISA 75.17-1989:1991 Edition

ISA 75.17-1989:1991 Edition

$12.35

Control Valve Aerodynamic Noise Prediction

Published By Publication Date Number of Pages
ISA 1991-06-19 32
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Full Description

This standard establishes a method to predict the noise generated in a control valve of standard
design by the flow of compressible fluid and the resulting noise outside of the pipe and
downstream of the valve. The transmission loss ( TL) equations are based on a rigorous analysis
of the interaction between the sound waves that exist in the pipe and the many coincidence
frequencies in the pipe wall. Commercial pipe specifications allow a relatively wide tolerance in
pipe wall thickness. This limits the value of the very complicated mathematical methods required
for a rigorous analysis; calculations prove that a simplified expression is justified.
The equations in this standard make use of the valve sizing factors defined in ANSI/ISA-S75.01
and ANSI/ISA-S75.02.
This method was developed from the fundamental principles of acoustics, fluid mechanics, and
mechanics.

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