2. Noise in liquid or solid media
A rotating pump generates noise in three forms: hydraulic noise, which can be considered the pump's primary noise, solid-borne noise, which is both primary and secondary, and airborne noise, which is a secondary noise generated by the first two through noise radiators that form a more or less complex transmission chain, in which piping plays a major role.
2.1 Specific characteristics of hydraulic noise
With the exception of what concerns the sensitivity of the ear, the notions we have just seen § 1
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Noise in liquid or solid media
Sources of pump noise
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