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Survey of 25 years’ experience with (in-situ) rotor retaining-ring inspections

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There has been a growing interest in the condition assessment of retaining rings of generator rotors. This interest results from the stress corrosion sensitivity of the materials used for retaining rings. KEMA has now been carrying out ultrasonic inspections of rotor retaining rings for more than 25 years (in-situ, using the KIRR system, for the past 10 years). Different ring geometries require different solutions: ie different manipulators, scan techniques and ultrasonic techniques. In addition to the availability of a reliable NDT programme for the detection of indications it was, self evidently, also necessary to implement supplementary evaluative techniques for the characterisation of defects. Characterisation of defect indications is also extremely important for the fitness-for-purpose analysis which is available as a back-up service during the (in-situ) inspection.

Document Type: Research Article


Publication date: 2005-09-01

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