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Low-pressure turbine components (rotor steeple grooves, blade roots, disk bore, disk rims and anti-rotating holes) require phased array inspection for detection and sizing of possible service-induced cracks.
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Field aspects and defect co-ordinates - PA results correlation lines are commented.ΔΆ.0 IMS capability demonstration on low-pressure turbine components Comparison between PA calls and MP/fracture mechanics results are illustrated. Different aspects of this process will be discussed and illustrated, such as pattern recognition, redundancy in detection and sizing, probe-defect relationship using forward-inverse ray-tracing problem, confirmation of FE stress areas on components, possibility and limitation of PA to avoid false calls or missing fatigue/SCC cracks. The paper will focus on reliability process of PA capability.
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A d & m generator and turbine repair st louis crack#
Crack detection and sizing examples in disk rims, rotor steeples and blade roots of different turbine types are presented and compared with 3-D stress analysis, MP indications, metallographic replicas and fracture mechanics results. Different aspects of capability demonstration process are illustrated and commented. The paper presents a summary of capability demonstration and crack confirmation during a five-year field application of phased array ultrasonic technology on low-pressure turbine components manufactured by General Electric, Westinghouse, Alstom/ABB, Siemens/Parsons. Inspection and Maintenance Services- Ontario Power Generation Inc. Phased Array Ultrasonic Inspection: A Reliable Tool for Life-Assessment of Low-Pressure Turbine Components.