What Do You Know About The Starting Principles Of Centrifugal Pumps

Jan 25, 2025

Centrifugal pump is a type of vane pump that relies on the rotating impeller to transfer mechanical energy to the liquid during the rotation process. Due to the interaction between the blades and the liquid, the pressure energy of the liquid increases, achieving the purpose of transporting the liquid. So, what should we do before starting the centrifugal pump?

Four points should be noted when starting a centrifugal pump:

1. The head generated by a centrifugal pump at a certain speed has a limited value. The working point flow rate and shaft power depend on the condition of the device system connected to the pump (such as position difference, pressure difference, and pipeline loss). The head changes with the flow rate.

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

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

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

Because 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. Its gate valve can automatically open to lift the water. Therefore, the gate valve must be closed first.