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Gas Turbine Repair Technology nent to right cylinders. The process involves mechanical adjustment of the liner bodies with appropriate heat treatment procedures. Cir- cumferential cracking around the aft end of the DLN-2 liner is also a common distress. These liners can be made more robust by the replace- ment of the aft section with a design that pro- vides better cooling. TIL 1240 covers this modi- fication in some detail. DLN-2 cap assemblies are restored by both piece part replacement and/or repair, depend- ing on the severity and type of wear. Impingement plates on the cap often crack and require weld repairs. The many tiny cooling holes in the cap are restored by Electrode Discharge Machining (EDM) after the weld re- pairs. Figure 21. Combustion liner air flow test machine Transition Pieces Most turbine-run transition pieces (TPs) expe- rience distortion around the picture frame due to time and temperature causing excessive gaps between the end seal slots between adjoining transition pieces. Uniquely designed inspec- tion fixtures are employed to ensure the dimen- sional fits of the transition pieces against the mating surfaces of the turbine. A single-piece fixture is used for individual adjustments and a 360° fixture is used to fit-up a complete set, to simulate installation in a unit. Coordinate Measuring Machine (CMM) technology is being implemented in select service centers in order to minimize inspection times and im- prove accuracy. Where needed, oversized end seals are used to assure proper seal engagement. The custom fit seals are sized during the final inspection in the 360° fixture which simulates installation in the machine. (See Figure 22.) This saves time and machining costs during installation in the tur- bine. However, turbine shell and first-stage noz- zle “out-of-roundness” may alter the simulation fixture data obtained by the service center. Figure 22. 360° transition piece fixture When it is more expedient to replace the pic- ture frame, another fixture is employed. Re- placement picture frames are aligned in the fix- ture and welded in place. The replacement frames can be manufactured from original ma- terial, or in some instances a more creep- or wear-resistant material may be employed, depending on the nature of the distress encountered. In FA model TPs, cracking is also common along the body sidewall. This cracking can be very severe, and requires repair using coupon inserts to replace damaged areas of the TP body with new material. GE has also developed a modification to the TP outer impingement sleeve that can be retrofitted to existing transi- GE Power Systems ■ GER-3957B ■ (04/01) 13PDF Image | Gas Turbine Repair Technology GE
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