Gas Turbine Handbook : Principles and Practices

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216 Gas Turbine Handbook: Principles and Practices Figure 13-9. Can-annular combustor failure due to liquid carry-over in the fuel gas. 30,000 horsepower gas turbine-pump drive unit with less than 24,000 operating hours. shown in Figure 13-25 and 13-26 and tip condition as seen in Figure 13-27, can be evaluated. While a distorted temperature profile would have been an early indication of the burnt turbine blade tips, damage would have had to progress beyond the stage visible in the other photographs before a gas path analysis would have indicated a problem. Very early signs of damage due to erosion, corrosion, oxidation, or FOD can be detected to the degree shown in Figure 13-28. Additional information regarding engine health can be obtained on gas turbines equipped with boroscope ports located between turbine stages. Utilizing these ports is best accomplished with a rigidtype, 90-degree boroscope. This port may be provided in either the
Boroscope Inspection 217 Figure 13-10. Can-annular combustor failure (burning and cracking) due to liquid mist in the fuel gas. 55,000 horsepower gas turbine-generator unit with less than 10,000 operating hours. second- or third-stage turbine nozzle area depending on the total number of turbine stages. Through this port, the trailing edge of the upstream turbine blades and the leading edge of the downstream turbine blades can readily be viewed. Figure 13-29 shows a buildup of a foreign residue on the leading edges of the third stage turbine blades that would have been visible on a boroscope inspection. Gas turbine performance and vibration trend analyses are important tools to be used in keeping gas turbine down-time and overhaul expenses to a minimum. Periodic boroscope inspections should also be used.
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Gas Turbine Handbook: Principles an
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Gas Turbine Handbook: Principles an
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Dedication This book is dedicated t
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Contents PREFACE ..................
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Chapter 13—BOROSCOPE INSPECTION .
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Preface to the Third Edition The ne
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Acknowledgments I wish to thank the
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2 Gas Turbine Handbook: Principles
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Figure 2-3. Courtesy of United Tech
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Chart 8-1 Gas Turbine Environments
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Appendix A-2 304 Gas Turbine Handbo
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5. Weather Hood Material __________
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Appendix C-6 Air/Oil Cooler Specifi
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9. Drive Requirements A. Hydraulic
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22. Packaging For Shipment Per Spec
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Parameters Units NH 3 CO H 2 CH 4 C
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.055 Parameters Units 1/0 .88/.12 .
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Koppers Foster Blue Coal Gas Winkle
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