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Gas Turbine Repair Technology Figure 32. TBC applied to nozzle partition Figure 30. Turbine run transition piece with roboti- cally-applied TBC (8,000 hours) Figure 33. TBC applied to nozzle sidewall and leading edge Figure 31. Turbine run transition piece with manu- ally-applied TBC (8,000 hours) partitions, while Figure 33 shows TBC applied to a nozzle sidewall and leading edge. Recent advances in nozzle coating technology include a Class A TBC (MCrAlY bondcoat with an yttria-stabilized topcoat). Maintaining the critical dimensions of the throat area during the coating application is accomplished by con- trolled robotic application. This assures that the nozzle’s airflow and harmonics are not com- promised, as can happen with manually applied coatings. Special finishing operations also as- sure proper gas flow dynamics. When these ma- terial enhancements are combined with GE’s robotic control process, a superior life exten- sion product results. Service Background GE has developed an entire technology area for its gas turbine repair businesses. By coordinat- ing the repair business (Global Inspection and Repair Services) with GE Gas Turbine, LLC, GE Power Systems has reduced repair technology development and implementation cycle times to the marketplace. GE’s gas turbine repair business is a global net- work of wholly-owned and joint venture facili- ties. Figure 34 shows the facilities’ global loca- tions. Including service centers that work only on steam turbines and generators, there are more than 50 repair facilities around the world GE Power Systems ■ GER-3957B ■ (04/01) 18PDF Image | Gas Turbine Repair Technology GE
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