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Pump vibration : Case studies

Severe vibration levels are observed on tested pumping stations in Egypt of different types: centrifugal, axial, vertical, and inclined units. Vibration severity has been evaluated on the bearings of the pumping units where unacceptable levels of vibration have been measured. Case studies are introduced from different irrigation and drainage pumping units in the laboratory and field at different operating conditions to detect faults early and design predictive maintenance programs for maintaining smooth and safe operation, and satisfying water requirements. Cases include a fatigue failure problem in the field due to vibration of a centrifugal pump mounted horizontally, a bearing damage problem in the field of a vertically mounted axial flow pump, and excessive vibration level for a variable speed motor in the lab. The investigation has been carried out by recording vibration spectra at different operating conditions and doing modal testing to isolate sources of vibration, identify the exciting frequencies, and predict dynamic behavior at different operating conditions. The paper points out the importance of carrying out vibration analysis on pumping units in Egypt to control dynamic behavior and achieve optimum running conditions.