Pump-turbines, in particular reversible Francis units, have in the past represented a big challenge for bearing manufacturers. The high vibration levels that the bearings, mainly in the guidevanes and linkages, are submitted to during operation in the pumping mode have always represented a key cause of failures.Using modern design tools, turbine manufacturers have progressively been able to improve turbine design, to achieve a significant reduction in these vibrations. The increasing demand today for pumped-storage plants has encouraged Federal Mogul Deva to invest in the development of engineering solutions to assist turbine manufacturers to minimize the impact of vibrations on the pump-turbine distributor mechanism, that is, on the guidevane and linkage bearings.
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