Each pump, each compressor and each vacuum pump are potential exciters of pressure pulsations, system oscillations and acoustic effects. All these phenomena are non-linear processes providing considerable potential for failures and damages, often connected with energy losses and disturbing effects on product quality and system functionality. Unfortunately, such phenomena still do not receive the attention they deserve or are not recognized at all. For example, there was a centrifugal pump, in which a resonance situation occurred almost unnoticed. At a pump pressure of only 5 bar, the oscillation amplitude was approx. 15 bar. The noise arising from it was equal to a wavering whistling sound, but without being clearly noticeable. An oscillation expert was the only one to realize it; however, a bearing failure could not be avoided.
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