The Rotordynamic Integrity Of A New Machine - Vertical Hydraulic Turbine In Cryogenic Fluids
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This paper presents the rotordynamic characteristics of a vertical submerged hydraulic turbine generator obtained during design, manufacturing, shop testing, and site testing. The hydraulic turbine represents a new design with significant economic advantage in large LNG plants. Described are the steps that were required by the Technical Advisor to assure that the hydraulic turbines would operate with acceptably low vibration levels. This verification process included two major rotordynamic analysis, a modal analysis of the turbine housing support, and shop testing at full load and full speed with cryogenic fluid. Confirmed was that acceptable margins exist between predicted critical speeds and the wide operating speed range. The shop testing included a total of six hydraulic turbines (three with three stages, three with two stages). The rotordynamic evaluations were based on a two-level analysis with interaction of the flexible rotor and casing at the bearings and seals.
Habets, G.L.G.M.; Smalley, Anthony J. (2001). The Rotordynamic Integrity Of A New Machine - Vertical Hydraulic Turbine In Cryogenic Fluids. Texas A&M University. Turbomachinery Laboratories. Available electronically from