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212 Gas Turbine Handbook: Principles and Practices Figure 13-5. Carbon deposits distributed across the compressor blades. These deposits extend from the first to the sixth stage blades. 5,000 horsepower gas turbine-generator unit with over 16,500 hours operation. Figure 13-6. Boroscope view of last stage of compressor stators and blades. 5,000 horsepower gas turbine-generator unit after 1,000 hours operation.
Boroscope Inspection 213 Figure 13-7. View of last stage compressor blades with contamination evident on and between blades. 5,000 horsepower gas turbine-generator unit after 44,500 hours operation. noticeable on the turbine blades and turbine nozzles. This is material from the compressor blades and stators, that melts as it travels through the combustor and is deposited as a “plasma spray” on the turbine airfoils. Combustor And Fuel Nozzles If the manufacturer has not made combustor boroscope ports available several other alternatives are possible. • For heavy frame units the fuel nozzles can be removed and the combustor, first stage turbine nozzles and first stage turbine blades can be viewed. It may be necessary to fabricate a piece of rigid tubing to guide the boroscope through the combustor to the turbine nozzles and blades. The tubing must have an inside diameter slightly larger than the outside diameter of the boroscope and long enough to extend from the fuel nozzle plane to the first stage turbine nozzle plane. • For gas turbines with a can-annular design combustor it will be necessary to remove at least one fuel nozzle from each combustor to view all the turbine nozzles.
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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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100 Gas Turbine Handbook: Principle
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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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