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30 Gas Turbine Handbook: Principles and Practices employed to dampen vibration as shown in Figure 3-7. Improvements in metallurgy and casting techniques have allowed designers to eliminate mid-span shrouds and lacing wires. On many units, aero-derivative, hybrid, and heavy frame industrial, the nozzle guide vanes are manufactured in cast segments of two airfoils per segment up to half the nozzles per stage (Figure 3-8). The larger number of airfoils per segment do not facilitate airfoil coating and results in very high fabricating and coating cost. The large cross-sectional area of blades and vanes in heavy industrial turbines does not resist sulfidation corrosion attack, but can tolerate more corrosion than the thin, high aspect ratio, turbine blades of the aero-derivative machine. The heavy industrial machine of comparable horsepower pumps more fuel and approximately 50% more air than the aero-derivative unit. As a result, the turbine is exposed to a greater quantity of the elements that cause sulfidation corrosion (that is, it is exposed to more airborne salts and more fuel borne sulfur because it is pumping more air and consuming more fuel). This increased exposure to the elements that Figure 3-6. Courtesy of Rolls-Royce Industrial & Marine Gas Turbines Limited. Composite view of the Trent high pressure turbine blade showing its internal cooling scheme. The Trent is a growth version of the RB211 aero and industrial engine. The industrial Trent gas turbine is a 70,000 shaft horsepower engine.
Hardware 31 Figure 3-7. Courtesy of Power & Compression Systems. This is a 1970 vintage gas turbine designed with lacing wire to dampen the second stage turbine blades. Note the hollow 1st stage turbine blade indicating blade cooling and the corrosion on both the 1st and the 2nd-stage blades.
Page 2 and 3: Gas Turbine Handbook: Principles an
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Page 6 and 7: Dedication This book is dedicated t
Page 8 and 9: Contents PREFACE ..................
Page 10 and 11: Chapter 13—BOROSCOPE INSPECTION .
Page 12 and 13: Preface to the Third Edition The ne
Page 14 and 15: Acknowledgments I wish to thank the
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Page 28 and 29: Figure 2-3. Courtesy of United Tech
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Page 90 and 91: Figure 5-4. Courtesy of United Tech
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80 Gas Turbine Handbook: Principles
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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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