Evaluation of the residual life of steam turbine rotors
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The procedure of evaluation of residual life is applied to high-pressure and intermediate-pressure steam-turbine rotors. We consider the following mechanisms of crack initiation and growth: low-cycle thermal fatigue, high-cycle fatigue, and creep. To obtain conservative estimates, we use the worst possible characteristics of the materials. A detailed analysis of stress fields induced by centrifugal forces, steam pressure, rotational bending, and temperature is performed by the method finite-elements. As an example, the procedure is applied to the high-pressure rotor of Nikola Tesla power plant A, unit 3. Estimation of the residual service life of this rotor revealed some critical locations that should be subjected to more careful nondestructive inspection. The procedure is also applicable (without changes or with necessary modifications) to other components of power plants such as low-pressure rotors, steamlines, and casings. The entire procedure, including numerical analysis of nonstationary temperature and stress fields, was performed on a personal computer (PC 486).
KeywordsFatigue Steam Stress Field Crack Initiation Casing
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