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Gas Turbine Repair Technology Gas Turbine Component Life Diagram with Key Factors Turbine Operation Fuel Power Level Firing Temperature Operation Type Combustion Configuration Assembly Uprate Customer Condition Design Status Upgrade Potential No uprate desired Inspect at Site Inspect by Service Center New Parts Previous Repaired Parts Competitors Repaired Parts Continued Parts Uprate preliminary studies on which direction to take by looking on GE’s web page, www.gepower.com, under the Turbine Op- timizer. sion between the component replace, uprate or repair scenario. Typical gas turbine component damage that occurs during usage includes com- ponent cracking, foreign object damage (FOD), oxidation and corrosion. In many cases, the component’s condition at any given inspec- tion can be anticipated by the unit’s perform- ance. The damage may be obvious and the scope of repair may be relatively straightfor- ward. Of course, a replace/repair decision must be based on situational specifics. For example, a set of coated buckets with high operational hours showing signs of wear may be mechani- cally repaired without recoating and allowed to run to the end of its remaining life. In this par- ticular instance, recoating of the buckets was not a cost-effective option. Some damage will not be detectable through vi- sual observation. Accurate dimensional check and non-destructive examinations (NDE) tech- niques like flourescent penetrant inspection may reveal additional discontinuities, such as stress cracking, that require more extensive re- pairs (Figure 1). Additionally, on airfoils where Stores Inspect at Site Inspect by Service Center Table 3. Turbine component life flowchart Stores • Continuous Duty - Rupture - Creep Deflection - High-Cycle Fatigue - Oxidation - Erosion - Corrosion - Rubs/Wear - Foreign Object Damage • Cyclic Duty - Thermal Mechanical Fatigue - High-Cycle Fatigue - Rubs/ Wear - Foreign Object Damage Table 2. Potential failure modes – hot gas path components There exist several models that operators may incorporate to make the prime feasibility deci- Outage Design Materials Configuration Combustion Rotor Assembly Turbine Operation Outage Repair Workscope GE Power Systems ■ GER-3957B ■ (04/01) 2 Fuel Power Level Firing Temperature Operation Type Combustion Configuration Repair Workscope Assembly Continue Cycle to Turbine LifePDF Image | Gas Turbine Repair Technology GE
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