How to find the cause of cavitation in centrifugal pumps?

The occurrence of cavitation in centrifugal pump equipment is due to the pressure in certain local low-pressure areas near the inlet of the liquid channel decreasing to the saturated vapor pressure of the liquid, resulting in partial liquid vaporization. Factors that reduce the local pressure to the liquid vaporization pressure may be the cause of cavitation.
Solution: The resistance of the suction pipeline. The more elbows, valves, and other fittings are installed in the suction pipeline, the greater the pipeline resistance and the lower the inlet pressure of the pump. Therefore, minimizing unnecessary pipe fittings or increasing the diameter of the suction pipe as much as possible to reduce pipeline resistance can prevent pump cavitation
The installation height of a centrifugal pump, the higher the installation height of the pump, the lower the inlet pressure of the pump. Lowering the installation height of the pump can increase the inlet pressure of the pump. Therefore, a reasonable determination of the installation height of the pump can prevent cavitation from occurring in the pump
Structural measures: Adopting double suction impellers to reduce the flow velocity passing through the impeller, thereby reducing the pump's cavitation margin; Install a booster booster booster pump in front of a large high lift pump to increase the inlet pressure; The impeller is specially designed to change the liquid flow condition at the inlet of the blade; Add an inducer in front of the centrifugal impeller to increase the liquid flow pressure entering the impeller.
The temperature of the liquid being transported. When the temperature rises, the saturated vapor pressure of the liquid increases. When the temperature of the transported liquid increases while the inlet pressure of the pump remains constant, the saturated vapor pressure of the liquid may increase to be equal to or higher than the inlet pressure of the pump, causing cavitation to occur in the pump.
The density of the liquid. The higher the density of the liquid being transported, the smaller the suction height of the pump. When using a pump that has already been installed to transport liquids with lower densities to transport liquids with higher densities, the pump may produce cavitation. However, when using a pump that transports liquids with higher densities to transport liquids with lower densities, the inlet pressure of the pump is higher and cavitation will not occur.