Applying The Probabilistic Fitness-For-Service Concept For Assessing Reliability Of Weld Repaired Steam Turbine Rotors.
Abstract
The cost savings and fast turnaround offered by weld repair of turbomachinery rotors results in significant advantages to the end user when faced with the possibility of having to replace the rotor. However, it also carries a potential risk to reliability. Many rotors have been weld repaired and have been put back in service over the years. The reliability of the repairs have not been quantified, but have usually been proven only through the lack of failure. No standard way of decision making has developed because it is an ever evolving technology. The principal driver for repair is economics, and the technical justification for such repair is "fitness-for-service." A method to quantify the risk for weld repairing a rotor a priori is presented. This couples material properties characterization, fracture mechanics concept, and probabilistic type calculation to determine reliability of the repair. This extends the fitness-for-purpose concept and captures the randomness and uncertainties in controlling variables; thus, it is called the "probabilistic fitness-for-service" concept.
Description
LecturePg. 65-72
Subject
TurbomachinesCollections
Citation
Tipton, Anthony A.; Singh, Murari P.; Shepherd, C. D. (Doug) (1992). Applying The Probabilistic Fitness-For-Service Concept For Assessing Reliability Of Weld Repaired Steam Turbine Rotors.. Texas A&M University. Turbomachinery Laboratories. Available electronically from https : / /hdl .handle .net /1969 .1 /163523.