What Is The Reason Why Centrifugal Pumps Cannot Achieve Flow Head

Oct 16, 2025

 

Ⅰ Reasons for centrifugal pumps not meeting flow and head requirements

 

1. Centrifugal pump or suction pipe leaks air;

2. The suction pipeline or centrifugal pump inlet is blocked, and the suction resistance is too high;

3. The wear clearance of the impeller mouth ring is too large;

4. Impeller blockage or severe wear and corrosion;

5. The rotation direction of the centrifugal pump is incorrect or the impeller is installed in reverse;

6. The outlet valve of the centrifugal pump is not opened or not opened enough;

7. Insufficient motor speed;

8. The selection or performance of chemical centrifugal pumps does not match.

 

II Solution:

 

1. Check and clean the suction valve and pipeline;

2. Remove blockages from the impeller or replace the impeller;

3. Replace the impeller sealing ring;

4. Check and eliminate air leaks;

5. Open the outlet valve of the chemical centrifugal pump and adjust the valve opening;

6. Adjust the rotation direction of the pump;

 

 

7. Increase the motor speed;

8. Check the performance parameters of the pump to ensure they meet the operating requirements and make adjustments accordingly.

 

III Precautions for centrifugal pumps:

 

Acid and alkali resistant centrifugal pump is a type of vane pump that relies on a rotating impeller. During the rotation process, due to the interaction between the blades and the liquid, the blades transfer mechanical energy to the liquid, increasing the pressure energy of the liquid and achieving the purpose of transporting the liquid.

1.There is a limit value for the head generated by acid and alkali resistant centrifugal pumps at a certain speed. The working point flow rate and shaft power depend on the condition of the device system connected to the pump. The head changes with the flow rate.

2. Stable operation, continuous conveying, and no pulsation in flow and pressure.

3. Generally, there is no self-priming ability, and the chemical pump needs to be filled with liquid or the pipeline needs to be evacuated before it can start working.

4. The centrifugal pump is started when the discharge pipeline valve is closed, and the vortex pump and axial flow pump are started when the valve is fully open to reduce the starting power.

 

 

Because chemical centrifugal pumps rely on the centrifugal force of the impeller to create vacuum suction and lift water, when starting the centrifugal pump, the gate valve must be closed first and water must be filled. When the water level exceeds the impeller, the air in the centrifugal pump must be discharged before starting. After starting, a vacuum is formed around the impeller, which draws water upwards. The gate valve can automatically open to lift the water. Therefore, the gate valve must be closed first.