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Gas Turbine Repair Technology tion pieces. This modification will direct more cooling air to the body sidewall area, to mini- mize the cracking. The modification is shown below in Figure 23. Fuel Nozzles The global service center network repairs all types of GE fuel nozzles, from single tip “gas only” to multi-port dual fuel DLN-2 units. The evolution of combustion systems from single-tip to multi-tip fuel nozzle systems has necessitated new repair processes to be implemented at the service centers. These repairs result in restored fuel nozzles meeting new part dimensions and flow differentials that meet or exceed new part specifications. GE’s service centers maintain a broad inventory of consumable parts, such as c-seals, gaskets and lock plates, for all fuel noz- zle types. This ensures the fastest turnaround time possible. Flow testing of fuel nozzle tips and passageways is of critical importance, especially for multi- nozzle systems. It is vital that the same amount of fuel flows through each nozzle in a set. Equalized fuel flow minimizes temperature spreads as measured by the exhaust thermocou- ples and can-to-can pressure differences be- tween the combustors. Computerized flow-test equipment is used to meter and measure flows. Air-flow testing (Figure 24) is used for gas and air passages and water-flow testing is used for liquid passages. Figure 24. Fuel nozzle air flow test machine The flow-test units use a computer-controlled system that calculates the percent variation of each to that of the set tips. Bodies or covers are tested and then matched to fuel tips to com- pletely optimize the system. The final assembly is typically limited to a variance of less than 2% between assemblies. All accumulated fuel-flow data is saved for permanent records. Figure 23. TP impingement sleeve “scoop” Often, GE can help the customer trouble-shoot any problems by doing an incoming flow test. Chemical analysis, performed by taking residue samples as the fuel nozzles are disassembled, further identifies any additional fuel related problems. After disassembly, the parts are cleaned using ultrasonic equipment or glass bead blast. Parts then go through a non- destructive testing (NDT) process where bodies and covers are pressure checked for leaks. Detailed reports of fuel nozzle performance are then generated for the customer’s review. GE Power Systems ■ GER-3957B ■ (04/01) 14PDF Image | Gas Turbine Repair Technology GE
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