If there is a local evaporation of the liquid because the vapour pressure of the conveyed fluid is not reached, this is referred to as “cavitation”. Through the constriction of the free flow cross-sections, this influences the flow behavior of the centrifugal pump and results in a decrease of the head and the efficiency. Imploding gas bubbles may destroy existing protective layers on the surfaces inside the pumps. As a result, the metal surface is constantly attacked and ablated by chemicals.

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