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Gas Turbine Repair Technology design limits. GE’s I&RS Service Centers, dur- ing repair cycles, ensure that the cooling pas- sages are not constricted or blocked. Applying an Advanced Thermal Barrier Coating to the external surfaces of the bucket airfoil can re- duce the bulk metal temperature of the bucket. (See Figure 15.) Contact GE Energy Services for additional information about the correct coat- ing for your particular application. Rotors During a common day, a base-loaded MS7001EA will ingest approximately 56 million pounds of air. The chemical composition of the air entering the compressor inlet in terms of hu- midity, trace gases and particulate determine the extent of corrosion, erosion and deposit which the air flow path surfaces exhibit. Deposits on the surface of the gas path compo- nents are carefully removed for initial inspec- tions. The operating environment of the tur- bine rotor affects the maintenance needs and the inspection phase of the rotor overhaul cycle. The full workscope of complete overhaul of a GE rotor can only be performed once the ini- tial incoming inspection is accomplished. Once the compressor rotor is thoroughly cleaned, the assembly is visually inspected and characteristics such as wear, corrosion, macro- cracking, nicks and dents are fully documented. (See Figure 16.) GE has established criteria to which these inspection results are compared and decisions are made as to the workscope re- quired to repair the assembly. The functionality of the rotor is dependent upon the dynamic balance and vibration as- pects that the rotor as an assembly exhibits. As part of GE’s recommended rotor overhaul workscope during a rotor inspection, the total assembly is set up in a low-speed balance ma- chine. A low-speed balance check of the rotor is made to determine any imbalance, its magni- tude and location. Runout data is obtained on multiple diameters throughout the assembly to ensure the rotor concentricity and straightness. Each service center located throughout the globe has made the investments to provide sim- ilar capability in support of the growing fleet of gas turbines and the high standards that GE maintains. In general, turbine rotors experience the same mechanisms of wear and degradation that com- pressor rotors face. Due to the extreme temper- atures in the turbine, high temperature corro- sion, creep and oxidation also contribute to component distress. Some instances require that turbine and com- pressor wheels be given a rejuvenation of rabbet dimensions. These instances involve special processing such as High Velocity Oxy-Fuel (HVOF) sprayed deposits that have near-base material properties and can be precision ma- chined. Specialized measurement tooling and procedures analyzed with Six Sigma method- ologies have been implemented globally. They have demonstrated improvements to the assem- bly process and to the overall performance of the assembly long term. At assembly, the GE gas turbine rotor construc- tion practice is to individually balance rotor Figure 16. Compressor and turbine rotor assembled after cleaning GE Power Systems ■ GER-3957B ■ (04/01) 10PDF Image | Gas Turbine Repair Technology GE
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