{"id":6204,"date":"2026-09-11T11:05:08","date_gmt":"2026-09-11T09:05:08","guid":{"rendered":"https:\/\/www.fluidglobalsolutions.com\/cavitation-the-noise-that-should-never-exist\/"},"modified":"2026-09-11T11:48:31","modified_gmt":"2026-09-11T09:48:31","slug":"cavitation-the-noise-that-should-never-exist","status":"publish","type":"post","link":"https:\/\/www.fluidglobalsolutions.com\/en\/cavitation-the-noise-that-should-never-exist\/","title":{"rendered":"Cavitation, the noise that should never exist"},"content":{"rendered":"

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When an acoustic nuisance signals a safety margin running out<\/em><\/strong><\/p>\n

Pumping systems account for roughly 20% of global electricity demand, with peaks that exceed 50% of total plant consumption in some industrial applications. A figure that makes clear why even a small inefficiency has a real impact on costs \u2014 and centrifugal pumps, being the most common type in industrial settings, represent a significant share of that consumption.<\/p>\n

n our last deep dive, we covered impellers: shape, materials, selection criteria. But even a well-designed impeller can underperform \u2014 or suffer damage \u2014 if the pump’s suction conditions aren’t right. Cavitation is one of the most likely culprits, and anyone who works with pumping systems often recognizes it before they can even define it.<\/p>\n

In this article, we’ll look at what cavitation is, what the term NPSH (which governs it) means and, above all, how to recognize and prevent it before it turns into a costly problem.<\/p>\n

Picture liquid flowing through a suction pipe toward a pump. If pressure drops too far along the way, a “boiling” effect occurs (even at room temperature): small vapor bubbles form, and the moment they reach higher-pressure zones inside the pump, they collapse suddenly. This collapse is cavitation \u2014 a phenomenon that generates micro-impacts capable, over time, of eroding the impeller and other internal pump components.<\/p>\n

The margin that determines whether this happens has a name: NPSH (Net Positive Suction Head). On one side, the available NPSH \u2014 the pressure the system can actually guarantee at the inlet. On the other, the required NPSH \u2014 the minimum the pump demands to avoid cavitating. The rule is simple to state, less simple to always respect: available must exceed required, with a safety margin. Even a small reduction in that margin translates into a real loss of efficiency, with a direct impact on energy consumption.<\/p>\n

The signs that precede the onset of the phenomenon are clear and unmistakable. The most typical is acoustic: a noise similar to pebbles moving through the pipe, often accompanied by abnormal vibration. Add to this apparently unexplained drops in flow or pressure, and higher consumption under the same operating conditions.<\/p>\n

The most common causes, from a system design standpoint:<\/p>\n