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Gas Turbine Repair Technology Appendix Destructive Analysis: A Tool for Understanding Component Life GE Meeting Industry’s Demands The GE network of metallurgy laboratories have a wide range of capabilities to deal with the many material issues faced during the re- pair of Hot Gas Path components. (See Figure 35 and Figure 36.) The services that these laboratories provide have been developed to meet the exacting needs of the Power Generation and Oil & Gas industries. Each analysis is conducted to a con- sistently high standard by a dedicated team of experienced technicians and is supported by GE Materials Engineers. Figure 35. Houston Service Center Figure 36. Basildon Service Center Material Issues Gas turbine buckets are exposed to severe loading conditions, both in terms of tempera- ture gradients and stress concentration. Any mechanism that influences the material mi- crostructure likely varies bucket behavior and may adversely affect component life. It is there- fore essential that the bucket coating/ base material system is characterized to assess the component set integrity. Limitations of Non-Destructive Evaluation Non-Destructive Evaluation (NDE) can provide information on the effect of service on compo- nent integrity. However, many life-limiting ma- terial characteristics cannot be assessed by such techniques. (See Figure 37.) Destructive analysis is often the only reliable and accurate means to obtain details from crit- ical features beneath the surface that restrict component performance. Destructive investi- gations therefore play a central role in assess- ing the component set integrity. (See Figure 38.) Figure 37. Infrared thickness measurement The Need for Destructive Analysis Destructive analyses obtain fundamental infor- mation to help determine the necessary repair workscope. Selecting the appropriate rejuvena- tion program optimizes component life exten- sion and gas turbine efficiency. Furthermore, GE Power Systems ■ GER-3957B ■ (04/01) 21PDF Image | Gas Turbine Repair Technology GE
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