What type of impellers are used to counteract axial thrust on large capacity, centrifugal pumps?

Large capacity centrifugal pumps often experience axial thrust due to the pressure differential between the inlet and outlet of the pump. To counteract this axial thrust, double-inlet impellers are employed.

Double-inlet impellers are designed with two inlets, allowing fluid to enter the impeller from both sides. This configuration helps balance the forces exerted on the impeller, effectively mitigating the axial thrust that can occur in single-inlet designs. The dual entry thus creates a more uniform flow and pressure distribution, which stabilizes the impeller and reduces the risk of damage or excessive wear.

By utilizing double-inlet impellers in large pumps, engineers can enhance the reliability and efficiency of the system, ensuring that the pump operates smoothly without excessive loads on the bearings or other components.