Centrifugal pumps are prone to cavitation
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Medium: Backwash water, added later in the self-priming tank. It’s a 100-cubic-foot pump with a 100-mm pipeline; after filling the pump each time, the pressure is 0.24, and then when the outlet valve is slowly opened, the pressure drops and the system becomes vacuum. What could be the reason for this?
Possible reasons: 1. There is a leak in the buffer tank; carefully inspect all sealing points and eliminate the leaks； 2. The buffer tank must be filled to the brim when filling it, and exhaust should be ensured to be thorough ； 3. If there is a sudden drop in pressure during the process of opening the outlet valve, it is likely not a problem related to the minimum flow rate ； However, during normal continuous operation, care should be taken to ensure the minimum flow rate of the pump ； 4. What is the medium temperature? Prevent medium vaporization
Is it because the pump’s net positive suction head is insufficient, or is the medium prone to vaporization?
1. The self-acting valve on the pump outlet line opens after the pump starts up; flow rate control is difficult, and the outlet pressure tends to be low. 2. The diameter of the pump outlet pipe is larger than that of the inlet pipe.
The inlet pipeline is too narrow; the pump isn’t powerful enough to draw fluid through it
The inlet pipeline is thicker than the outlet one; try replacing the pipeline
1. There are leakage points in the buffer tank; carefully inspect all sealing points and eliminate them； 2. The buffer tank must be filled to the brim when filling it, and exhaust should be ensured to be thorough ； 3. Prevent the medium from vaporizing and causing cavitation.
The medium temperature is around 40 degrees; the sealing points are in good condition. After the pump was evacuated, the plug was removed and air was released