On-line eddy-current crack monitor: Final report

Technical Report · Fri Apr 01 04:00:00 EST 1988

OSTI ID:6956957

Bedrosian, G; Chari, M V.K.; Fealey, J A; Sober, T J

This report describes research work conducted for the Electric Power Research Institute under contract number RP1894-1, Eddy Current On-Line Monitoring for Crack Detection. The project investigated the feasibility of using electromagnetic non-destructive evaluation (NDE) techniques to monitor rotating metallic components of turbine-generators for incipient failures in an on-line mode. Turbine-generator components of particular interest were shafts, tubine discs, and generator retaining rings. Both electromagnetic analysis and laboratory experiments played a part in evaluating eletromagnetic NDE techniques for this application. This research project showed that electromagnetic NDE methods can feasibly detect and image surface-penetrating flaws in metallic objects rotating at the high peripheral speeds found in turbine-generators. A demonstration system using electromagnetic techniques was developed and produced color images in real-time of flaws in rotating laboratory test models. The system was also successfully demonstrated on a growing crack in a rotating shaft. Application of this technique to real turbine-generators will require additional effort. This report concludes with recommendations for adapting the demonstration system for use in a power plant.

• Research Organization: General Electric Co., Schenectady, NY (USA). Corporate Research and Development Dept.
• OSTI ID: 6956957
• Report Number(s): EPRI-CS-5694; ON: TI88009449
• Country of Publication: United States
• Language: English

Related Subjects

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22 GENERAL STUDIES OF NUCLEAR REACTORS
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CHEMICAL ANALYSIS
CRACK PROPAGATION
CRACKS
CURRENTS
DIAGNOSTIC TECHNIQUES
EDDY CURRENT TESTING
EDDY CURRENTS
ELECTRIC CURRENTS
ELECTRIC GENERATORS
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC TESTING
ENGINES
EQUIPMENT
FOSSIL-FUEL POWER PLANTS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MACHINERY
MAINTENANCE
MATERIALS TESTING
NONDESTRUCTIVE ANALYSIS
NONDESTRUCTIVE TESTING
NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
POWER PLANTS
RECOMMENDATIONS
ROTARY ENGINES
ROTATING GENERATORS
STEAM TURBINES
TESTING
THERMAL POWER PLANTS
TURBINES
TURBOMACHINERY