Nondestructive testing of large steam-turbine rotors. Final report
This is a report of the Nondestructive Evaluation, Task 2, of Research Project 502. The overall objective of RP502 was to develop and test a steam turbine rotor lifetime prediction system using field ultrasonic inspection results as input. The major efforts in Task 2 included development of data analysis techniques, evaluation of alternate nearbore inspection techniques, development of a boresonic inspection system (BUCS) representative of commercial inspection system, inspection of three retired rotors, and destructive analysis of the three rotors to compare ultrasonic results with actual flaw location and dimensions. Each of these subtasks, with the exception of the data analysis (reported in a separate report) and the addition of a discussion of an advanced ultrasonic boresonic system (TREES) developed and evaluated under RP502, is reported herein. Both the BUCS and TREES inspection results described the flaw locations and sizes accurately. After flaws of interest have been identified using the boresonic systems, operator interpretation of the ultrasonic signals is necessary to help distinguish serious from innocuous flaws. Two of the three rotors retired for large crack-like indications were found to contain residual ingot defects. None of the flaws destructively examined were cracks formed during service and, with the possible exception of one flaw, there was no evidence of crack propagation from original ingot flaws during service.
- Research Organization:
- Battelle Columbus Labs., OH (USA); Southwest Research Inst., San Antonio, TX (USA)
- OSTI ID:
- 6872352
- Report Number(s):
- EPRI-NP-2736; ON: DE83901108
- Resource Relation:
- Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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42 ENGINEERING
ROTORS
DEFECTS
ULTRASONIC TESTING
STEAM TURBINES
DATA ANALYSIS
EXPERIMENTAL DATA
ACOUSTIC TESTING
DATA
INFORMATION
MACHINERY
MATERIALS TESTING
NONDESTRUCTIVE TESTING
NUMERICAL DATA
TESTING
TURBINES
TURBOMACHINERY
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