1. Air leakage from centrifugal pump or suction pipe;
2. The suction line or the inlet of the centrifugal pump is blocked, and the suction resistance is too large;
3. The wear gap of the impeller ring is too large;
4. Impeller clogging or severe wear and corrosion;
5. The rotation direction of the centrifugal pump is wrong or the impeller is installed reversely;
6. The outlet valve of the centrifugal pump is not open or is not open enough;
7. The motor speed is not enough;
8. The selection or performance of the centrifugal pump does not match.
Treatment method:
1. Check and clean the suction valve and pipeline;
2. Remove the impeller blockage or replace the impeller;
3. Replace the impeller seal ring;
4. Check and eliminate air leakage;
5. Open the outlet valve of the pump and adjust the valve opening;
6. Adjust the rotation direction of the pump;
7. Increase the motor speed;
8. Check whether the performance parameters of the pump meet the requirements of working conditions and adjust them.
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