In the process of rebuilding a centrifugal pump, what is the last check that should be performed?

In the context of rebuilding a centrifugal pump, ensuring that the rotor turns over is a crucial final check. This step confirms several important aspects of the pump's assembly and function. When the rotor turns freely, it indicates that there is no binding or interference within the pump components, such as the impeller, bearings, and seals.

Checking for free rotation also assures that the assembly has been properly aligned and that the internal clearances are appropriate. If the rotor does not turn smoothly, further inspection is necessary to identify and rectify any issues that could lead to operational failures or inefficiencies in the pump's performance.

While verifying the type of packing, the setting of wear rings, and the size of the impeller are important throughout the rebuilding process, confirming that the rotor can turn is the final assurance that the assembly is correct and ready for operation. This step acts as a practical check of all the previous work done on the pump.