Steam turbine rotor life assessment. Final report
- Mitsubishi Heavy Industries Ltd., Tokyo (Japan)
For a high temperature rotor, the time when a crack first occurs is important for its life assessment, because it is closely connected with the time when counter measures necessary for the extension of life must be carried out. In addition, it is possible that the material in an early rotor is of low ductility and subject to embrittlement. For such rotors, it may be necessary to make the occurrence of cracks the limit of the rotor`s life, since such rotors may have a short life of crack propagation. Therefore, project RP2481-8 has been conducted aiming at the development of nondestructive methods for the assessment of the life of a rotor and its crack initiation. The methods which use the, replication initiation caused by creep and/or fatigue. The methods which use the replication technique, hardness measurement and X-ray diffraction have already been materialized by Mitsubishi Heavy Industries, Ltd. into the inspection apparatus named MACH for service rotors. Therefore, as Task 2 of this project, further development has been conducted based on the MACH apparatus, and, as the first step, its demonstration was carried out using rotors that were old and retired after long-term service. From the results obtained it was verified that the inspection apparatus enables access to the critical locations of high temperature rotor and that the inspection methods are applicable to its life assessment.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); Mitsubishi Heavy Industries Ltd., Tokyo (Japan)
- Sponsoring Organization:
- Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 10160482
- Report Number(s):
- EPRI-TR-103619-V2; ON: UN94013845
- Resource Relation:
- Other Information: PBD: Mar 1994
- Country of Publication:
- United States
- Language:
- English
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