Table 9.
MTTFD in supply of PDC drill based on different scenario
| Replication | A1 | A2 | A3 | A4 | A5 | A6 | A7 | A8 |
|---|---|---|---|---|---|---|---|---|
| 1 | 191 | 169 | 476 | 379 | 478 | 371 | 496 | 92 |
| 2 | 125 | 178 | 145 | 369 | 541 | 135 | 183 | 292 |
| 3 | 127 | 511 | 305 | 400 | 501 | 197 | 114 | 417 |
| 4 | 559 | 552 | 308 | 292 | 153 | 542 | 493 | 333 |
| 5 | 363 | 179 | 465 | 587 | 518 | 262 | 225 | 360 |
| 6 | 430 | 172 | 555 | 328 | 163 | 474 | 368 | 291 |
| 7 | 138 | 135 | 173 | 506 | 510 | 176 | 241 | 523 |
| 8 | 337 | 564 | 424 | 444 | 245 | 320 | 490 | 180 |
| 9 | 533 | 385 | 324 | 351 | 246 | 297 | 346 | 407 |
| 10 | 460 | 166 | 146 | 379 | 154 | 103 | 305 | 591 |
| 11 | 459 | 297 | 498 | 247 | 371 | 522 | 537 | 250 |
| 12 | 116 | 250 | 192 | 468 | 291 | 312 | 123 | 472 |
| 13 | 293 | 453 | 547 | 568 | 425 | 95 | 179 | 333 |
| 14 | 371 | 149 | 324 | 437 | 245 | 175 | 163 | 498 |
| 15 | 405 | 416 | 156 | 212 | 441 | 477 | 107 | 277 |
| 16 | 536 | 118 | 163 | 223 | 381 | 532 | 109 | 334 |
| 17 | 209 | 579 | 431 | 494 | 495 | 563 | 143 | 380 |
| 18 | 269 | 129 | 278 | 303 | 375 | 582 | 190 | 482 |
| 19 | 262 | 441 | 397 | 364 | 263 | 575 | 175 | 409 |
| 20 | 150 | 183 | 206 | 475 | 301 | 243 | 226 | 562 |
| MTTFD | 374.15 | 260.65 | 347.65 | 354.85 | 391.3 | 325.65 | 301.3 | 316.65 |
| Var(TTFD) | 16115.39 | 20917.92 | 29586.34 | 17078.34 | 11430.74 | 19885.60 | 27848.11 | 22446.13 |