Certain vibration, running, and assembly issues only become apparent at the intended speed. A test run at rated speed therefore allows for a more realistic evaluation than slow rotation or a purely visual inspection. The load and scope of the test remain dependent on the specific setup.

At idle, basic running behavior, direction of rotation, and mechanical abnormalities can be checked. A partial load test provides additional information on behavior under defined flow resistance and power consumption. The required test stage depends on the scope of the repair and the acceptance target.

The balancing check takes into account the impeller, rotational speed, bearings, and the agreed-upon evaluation standard. A good individual component can behave differently in the assembled system if seats, couplings, or the overall structure introduce additional influences. Therefore, it is determined whether the component, the impeller, or the complete unit is to be evaluated.

A complete test is advisable when the interaction of the impeller, shaft, bearings, motor, coupling, and housing needs to be verified. A component test is more sufficient for clearly defined tasks and known interfaces. Transportability, test setup, and the required results determine the choice.

The following information is required: design type, dimensions, weight, speed, motor and connection data, as well as details on bearings, coupling, and direction of rotation. The desired test objective, target values, and available vibration or performance data are also important. For complete units, connection and installation conditions must be clarified beforehand.