Cavitation in pumps must be detected and prevented. The present work is an attempt to use the\nsimultaneous measurements of vibration and sound for variable speed pump to detect cavitation.\nIt is an attempt to declare the relationship between the vibration and sound for the same discharge\nof 780 L/h and NPSHA of 0.754 at variable speeds of 1476 rpm, 1644 rpm, 1932 rpm, 2190\nrpm, 2466 rpm, and 2682 rpm. Results showed that: the occurrence of cavitation depends on the\nrotational speed, and the sound signals in both no cavitation and cavitation conditions appear in\nrandom manner. While, surveying the vibration and sound spectrums at the second, third, and\nfourth blade passing frequencies reveals no indications or phenomenon associated with the cavitation\nat variable speeds. It is recommended to survey the vibration spectra at the rotational and\nblade passing frequencies simultaneously as a detection unique method of cavitation.
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