Determination of pump evacuation
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Can pump cavitation be understood in this way: cavitation may occur when the pump’s flow rate is below the flow rate corresponding to the head on the performance curve? Still, as long as the pump is operating at a flow rate above the minimum level, it will not experience vacuum conditions.
There are mainly two reasons for this: one is cavitation, and the other is gas entrapment. Cavitation can occur in the following situations: clogged inlet filter, inlet valve fully open, low NPSH of the unit, vaporization of the fluid due to the pump operating below the minimum flow rate specified by thermal control, and high NPSH of the pump. Air binding occurs when the pump is not filled properly and there is air inside the pump; this results in a low centrifugal force, which prevents sufficient low pressure from being created at the center of the impeller to draw liquid into the pump.
The outlet pressure gauge experiences large fluctuations, the outlet flow rate also fluctuates significantly, and the pump generates loud vibration sounds.