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Boroscope Inspection 227<br />

Figure 13-28. Early signs of sulfidation corrosion on a first stage turbine<br />

nozzle concave surface. 5,000 horsepower gas turbine-generator<br />

drive unit after 1,000 hours operation.<br />

Figure 13-29. “Chalky-substance” build-up on third stage turbine<br />

blades. 4,500 horsepower gas turbine-generator drive unit with<br />

17,000 operating hours since last overhaul and 80,000 total hours.

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