o_191ln0gpf9pgfdj4601afj5gva.pdf

Recommendations

Info

210 Gas Turbine Handbook: Principles and Practices blades. Mid-turbine boroscope ports can be used to view the turbine blades both upstream and downstream of the boroscope position. Compressor Blades And Stators Except for some aero-derivative gas turbines, boroscope ports are rarely provided within the compressor section of the gas turbine. However, the compressor inlet guide vanes and first stage compressor blades are accessible via the clean air compartment immediately upstream of the gas turbine. For a thorough examination, a boroscope can be inserted through the inlet guide vanes and all of the first stage blades inspected as the compressor rotor is turned. A boroscope view of the first stage compressor blades is shown in Figure 13-4. Note: the tar-like substance on the leading edge of the airfoil demonstrates the detail that can be achieved. This amount of contamination does affect compressor performance. Contamination such as this can be removed with a wash solution as recommended by the gas turbine manufacturer. However, if the wash/rinse length is inadequate, the residue will be distributed over a larger portion of the airfoil surface. This is shown in Figure 13-5. As the contamination accumulates the compressor efficiency would continue to deteriorate. The first stage compressor stators can also be partially viewed through the inlet guide vanes and the first stage blades. It is advisable to use extreme caution when inserting the boroscope probe into the blade path (be sure the rotor is locked so that it cannot be turned). Figure 13-6 is a boroscope view of the last (eleventh) stage stators and blades of a 5,000 brake horsepower gas turbine. All of the boroscope photographs were taken using a 35mm single lens reflex camera attached to a flexible fiber optic boroscope. As there was not a boroscope port provided on this particular unit, a fuel nozzle was removed to inspect this area. After removing a fuel nozzle, the boroscope was snaked into the diffuser case toward the stators and blades. Note that with proper lighting the view is clear and sharp. While only a few stator vanes can be viewed from this position, by turning the rotor all the compressor blades can be viewed. To view all stator vanes, continue removing fuel nozzles around the circumference of the engine. Figure 13-7 is a photograph of the last (eleventh) stage compressor blades similar to that of Figure 13-6. The contamination visible in the compressor, specifically between the blades in Figure 13-7, would have been obvious when viewed through a boro-
Boroscope Inspection 211 scope. Due to the relative light weight of compressor blades, especially at the higher compression stages, blade failures may not create a noticeable amount of damage downstream of the compressor. Often only minimal damage is visible at the discharge of the compressor or the combustor inlet. Even damage resulting from severe compressor surge, which could wipe out several rows of compressor blades (and stator vanes if they are the cantilever design), seldom show a great amount of damage at the compressor discharge stators. However, a coating of a “plasma spray” consisting of compressor material will be Figure 13-4. Tar-like deposit on a first stage compressor blade leading edge. 5,000 horsepower gas turbine-generator drive unit after 1,000 hours operation.
Page 2 and 3:
Gas Turbine Handbook: Principles an
Page 4 and 5:
Gas Turbine Handbook: Principles an
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
Page 16 and 17:
2 Gas Turbine Handbook: Principles
Page 18 and 19:
Page 20 and 21:
Page 22 and 23:
Page 24 and 25:
Page 26 and 27:
Page 28 and 29:
Figure 2-3. Courtesy of United Tech
Page 30 and 31:
Page 32 and 33:
Page 34 and 35:
Page 36 and 37:
Page 38 and 39:
Page 40 and 41:
Page 42 and 43:
Page 44 and 45:
Page 46 and 47:
Page 48 and 49:
Page 50 and 51:
Page 52 and 53:
Page 54 and 55:
Page 56 and 57:
Page 58 and 59:
This page intentionally left blank
Page 60 and 61:
Page 62 and 63:
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
Page 70 and 71:
Page 72 and 73:
Page 74 and 75:
Page 76 and 77:
Page 78 and 79:
Page 80 and 81:
Page 82 and 83:
Page 84 and 85:
Page 86 and 87:
Page 88 and 89:
Page 90 and 91:
Figure 5-4. Courtesy of United Tech
Page 92 and 93:
Page 94 and 95:
Page 96 and 97:
Page 98 and 99:
Page 100 and 101:
Page 102 and 103:
Page 104 and 105:
Page 106 and 107:
Page 108 and 109:
Page 110 and 111:
Page 112 and 113:
Page 114 and 115:
100 Gas Turbine Handbook: Principle
Page 116 and 117:
Page 118 and 119:
Page 120 and 121:
Page 122 and 123:
Page 124 and 125:
Page 126 and 127:
Page 128 and 129:
Page 130 and 131:
Chart 8-1 Gas Turbine Environments
Page 132 and 133:
Page 134 and 135:
Page 136 and 137:
Page 138 and 139:
Page 140 and 141:
Page 142 and 143:
Page 144 and 145:
Page 146 and 147:
Page 148 and 149:
Page 150 and 151:
Page 152 and 153:
Page 154 and 155:
Page 156 and 157:
Page 158 and 159:
Page 160 and 161:
Page 162 and 163:
Page 164 and 165:
Page 166 and 167:
Page 168 and 169:
Page 170 and 171:
Page 172 and 173:
Page 174 and 175: 160 Gas Turbine Handbook: Principle
Page 182 and 183: This page intentionally left blank
Page 270 and 271: Figure 15-4. Corinth Motor Oil Refi
Page 274 and 275:
Page 276 and 277:
Page 278 and 279:
Page 280 and 281:
Page 282 and 283:
Page 284 and 285:
Page 286 and 287:
Page 288 and 289:
Page 290 and 291:
Page 292 and 293:
Page 294 and 295:
Page 296 and 297:
Page 298 and 299:
Page 300 and 301:
Page 302 and 303:
Page 304 and 305:
Page 306 and 307:
Page 308 and 309:
Page 310 and 311:
Page 312 and 313:
Page 314 and 315:
Page 316 and 317:
Page 318 and 319:
Appendix A-2 304 Gas Turbine Handbo
Page 320 and 321:
Page 322 and 323:
Page 324 and 325:
Page 326 and 327:
Page 328 and 329:
Page 330 and 331:
Page 332 and 333:
Page 334 and 335:
Page 336 and 337:
Page 338 and 339:
Page 340 and 341:
Page 342 and 343:
Page 344 and 345:
Page 346 and 347:
Page 348 and 349:
Page 350 and 351:
Page 352 and 353:
Page 354 and 355:
Page 356 and 357:
Page 358 and 359:
Page 360 and 361:
Page 362 and 363:
Page 364 and 365:
Page 366 and 367:
Page 368 and 369:
Page 370 and 371:
5. Weather Hood Material __________
Page 372 and 373:
Appendix C-6 Air/Oil Cooler Specifi
Page 374 and 375:
9. Drive Requirements A. Hydraulic
Page 376 and 377:
22. Packaging For Shipment Per Spec
Page 378 and 379:
Parameters Units NH 3 CO H 2 CH 4 C
Page 380 and 381:
.055 Parameters Units 1/0 .88/.12 .
Page 382 and 383:
Koppers Foster Blue Coal Gas Winkle
Page 384 and 385:
Page 386 and 387:
Page 388 and 389:
Page 390 and 391:
Page 392 and 393:
Page 394 and 395:
Page 396 and 397:
Page 398 and 399:
Page 400 and 401:
Page 402 and 403:
Page 404 and 405:
Page 406 and 407:
Page 408 and 409:
Page 410 and 411:
Page 412 and 413:
Page 414 and 415:
Page 416 and 417:
Page 418 and 419:
Page 420 and 421:
Page 422 and 423:
Page 424 and 425:
Page 426 and 427:
Page 428 and 429:
Page 430 and 431:
Page 432 and 433:
Page 434 and 435:
Page 436 and 437:
Page 438 and 439:
Page 440 and 441:
Page 442 and 443:
Page 444 and 445:
Page 446 and 447:
Page 448 and 449:
Page 450 and 451:
show all

o_191ln0gpf9pgfdj4601afj5gva.pdf

Create successful ePaper yourself

Delete template?

Save as template?