How does axial thrust compare among different impeller types for a rotodynamic vertical pump?

Q. How does axial thrust compare among different impeller types for a rotodynamic vertical pump?

A.  The net axial downthrust force is carried by the pump shaft. The shaft will stretch, or elongate, under this load. Before the pump starts up, any stretch that occurs is due to rotor weight, the sum of the static forces. The thrust load will increase after the pump starts up due to the addition of the dynamic forces.

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