Pressure drop during centrifugal pump operation
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I installed a centrifugal pump in my work area; the pump is mounted on the flow of water, and there is a diaphragm pump used for vacuum creation at the pump’s inlet. Once the pump starts up with the help of this diaphragm pump, the pressure remains normal. However, after half an hour, the pressure begins to drop, and the pump also vibrates more intensely. I suspect that bubbles in the water are being drawn into the pump, and I’m wondering if there is any solution to this problem
It's still better to install a pressure gauge for direct monitoring. It might be caused by changes in inhalation pressure. For reference.
Does the pressure gauge have a drain valve? Just exhaust it and it’ll be fine.
After the diaphragm pump has created a vacuum and the centrifugal pump starts, shouldn’t the diaphragm pump stop?
The diaphragm pump is stopped; there is a check valve at the inlet
The problem can be solved by finding a way to increase the liquid column height at the pump inlet, or by adding a self-priming tank to lower the water level below the inlet
Possible causes: 1. Air leakage in the intake pipe or the valves on the pipeline； 2. The effective net positive suction head of the pump is too low.