This paper describes a test program used to measure and eliminate the vibration which had produced extensive cracking in the blading of a slow-speed, 40,000-hp hydraulic turbine. Strains, accelerations, and pressures were measured at various locations on the turbine runner while the unit was in operation. The instruments used for these measurements were of the resistance type. Instrument signals were transmitted through collector rings and brushes to direct-writing oscillographs. The vibration was eliminated successfully by an inexpensive modification of the runner blading which is described in the paper.
One-way low-level surge tanks may be used for the control of water hammer at pumping plants where water-column separation occurs in the discharge line subsequent to a power failure at the pump motors. This paper describes the characteristics of these tanks and also includes a typical graphical water-hammer solution of the problem.
This paper describes a method of analysis of the stresses in a hydraulic turbine stay ring which includes the effect of the bending moment applied to the stay vanes by the forces on the ring due to the membrane load of the spiral case, the pressure on the face of the ring, and the head cover load. In most cases the bending stresses in the stay vanes, previously neglected, are shown to be of substantial magnitude. These bending stresses can be reduced by proper positioning of the stay vanes within the stay ring structure.
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