How to avoid cavitation

Cavitation and NPSH – what does that mean? Definition, risks and avoidance of cavitation. Explication of the NPSH value.

11/11/2020 11:30 AM – 11/11/2020 12:00 PM

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Cavitation and NPSH – what does that mean? Definition, risks and avoidance of cavitation. Explication of the NPSH value.

Language: German

Questions and Answers: Yes

Action description

One problem that can occur when operating a pump is the breakdown of vapor bubbles in the pumped medium. This typical phenomenon, known as cavitation, occurs when the vapor pressure of the product is partially undercut at the inlet of a pump and the resulting vapor suddenly condenses in the pump. This creates so-called microjets, which put a lot of stress on the components of the pump. Depending on the medium and the system layout, cavitation can already occur at a product temperature of around 20 ° C. It is only a matter of time before the pump will be damaged by cavitation. The NPSH values (Net Positive Suction Head) provide information about the risk of cavitation. The lower a NPSHR value, the lower the risk of cavitation. With HYGHSPIN screw pumps, cavitation is avoided due to the design, because only very little turbulence occurs during axial conveyance and thus low NPSHR values of up to 0.5 m. ...read more