Repair is often worthwhile if the housing and essential components can be reused, spare parts are available or can be reproduced, and the pump subsequently operates reliably at the required operating point. We compare the extent of the damage, repair costs, delivery time, energy consumption, and expected remaining service life. If a repair is not technically or economically feasible, we consider a replacement or modification of the pump system.

Possible causes include wear on the impeller and sealing gaps, deposits, blockages, cavitation, a change in speed, or increased system resistance. Fittings, piping, and controls also affect the actual performance. Therefore, when necessary, we consider not only the individual pump but also its interaction with the system. Measured values ​​and characteristic curves help to narrow down the cause.

The characteristic curve comparison shows whether the flow rate, delivery head, and power consumption are appropriate for the intended operating point. Deviations can indicate hydraulic wear, unsuitable settings, or changed system conditions. After a repair, this method can also be used to verify whether the agreed performance is being achieved again. Which parameters are recorded depends on the pump type, test bench, and specific requirements.

We compare the measured flow rate, delivery head, and power consumption with the pump and system characteristic curves. Unusual noises, vibrations, temperatures, or cavitation can provide additional clues. We also check whether the valve position, pipe network, medium, or process requirements have changed. Only a combined analysis of the pump and system reveals whether the operating point is consistently unfavorable.

Helpful information includes the pump's nameplate and type, details about the medium and temperature, operating values ​​or characteristic curve, and a description of the symptoms. Photos, measurement data, repair history, and information about the installation location, accessibility, and system downtime will expedite the initial assessment. Based on this information, we can effectively prepare the next diagnostic step, such as an on-site visit or delivery to the factory.

We compare the actual demand with the flow rate, delivery head, power consumption, and system characteristic curve. Oversizing, throttling losses, worn hydraulics, or an unsuitable control system can cause unnecessary energy losses. Depending on the findings, operational adjustments, speed control, hydraulic overhaul, or a more suitable pump may be considered.