Abstract
In the present work, the current condition and non–destructive testing results of a gas turbine rotor are presented. Moving blades and nozzles of a turbo generator unit were inspected. Important longitudinal cracks were found in convex and concave sides of most nozzles blocks after more than 20 years of operation. Estimation of life prediction by means of a simplified method programmed in Matlab was elaborated in order to calculate fatigue and creep damage in the rotor due to steady and transient operation during normal start–ups and shut–downs of the turbine. Fatigue models were implemented in the programme taking into account low cycle fatigue phenomenon and high temperature effects on thermal and mechanical properties of rotor material. A simplified creep analysis calculation was accomplished by using a programme for mathematical calculations. Some conclusions on fatigue life and creep predictions were obtained and some recommendations for reliable operation are issued in order to improve mechanical behaviour and extend useful life of the main hot gas path components.
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