Table 14.3b. Calculated Rated Internal Working Pressure for Copper Tube: Type L*

Nominal or standard size, in inchesAnnealedDrawn**
S= 6000 psi 100FS= 5100 psi 150FS= 4900 psi 200FS= 4800 psi 250FS= 4700 psi 300FS= 4000 psi 350FS= 3000 psi 400FS= 10,300 psi 100FS= 10,300 psi 150FS= 10,300 psi 200FS= 10,300 psi 250FS= 10,000psi 300FS= 9,700 psi 350FS= 9,400 psi 400F
1⁄4 912 775 745 729 714 608 456 1569 1569 1569 1569 1524 1478 1432
3⁄8 779 662 636 623 610 519 389 1341 1341 1341 1341 1302 1263 1224
1⁄2 722 613 589 577 565 481 361 1242 1242 1242 1242 1206 1169 1133
5⁄8 631 537 516 505 495 421 316 1086 1086 1086 1086 1055 1023 991
3⁄4 582 495 475 466 456 388 291 1002 1002 1002 1002 972 943 914
1 494 420 404 395 387 330 247 850 850 850 850 825 801 776
11⁄4 439 373 358 351 344 293 219 755 755 755 755 733 711 689
11⁄2 408 347 334 327 320 272 204 702 702 702 702 682 661 641
2 364 309 297 291 285 242 182 625 625 625 625 607 589 570
21⁄2 336 285 274 269 263 224 168 577 577 577 577 560 544 527
3 317 270 259 254 248 211 159 545 545 545 545 529 513 497
31⁄2 304 258 248 243 238 202 152 522 522 522 522 506 491 476
4 293 249 240 235 230 196 147 504 504 504 504 489 474 460
5 269 229 220 215 211 179 135 462 462 462 462 449 435 422
6 251 213 205 201 196 167 125 431 431 431 431 418 406 393
8 270 230 221 216 212 180 135 464 464 464 464 451 437 424
10 271 231 222 217 212 181 136 466 466 466 466 452 439 425
12 253 215 207 203 199 169 127 435 435 435 435 423 410 397

* Based on maximum allowable stress in tension (psi) for the indicated temperatures (°F).

** When brazing or welding is used to join drawn tube, the corresponding annealed rating must be used. For more information, see Pressure Ratings and Burst Strength