Vibration of Penstocks in Hydroelectric Installationsby Frederick O. Ruud,
Abstract: In many penstocks and pump discharge lines of turbines and pumps, pipe vibrations have been observed. Many of these installations have blade and vane arrangements other than the classic case presented by J. P. Den Hartog, where the number of blades and number of vanes differ by one. Curves are presented to show the envelope of lowest natural frequencies of pipeline vibration for various diameter, thickness, and stress level ratios. A large centrifugal pump is discussed, with seven impeller blades and thirteen guide vanes, rotating at 514 rpm, where a serious problem arises with 120 Hz pulsations.
Subject Headings: Pumps | Vanes | Vibration | Hydro power | Conduits | Turbines | Natural frequency | Power plants
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