Table 14.3e. Calculated Rated Internal Working Pressure for Copper Tube: ACR*** (Air Conditioning and Refrigeration Field Service)

Nominal or standard size, in inches Annealed Drawn**
Coils
S= 6000 psi 100F S= 5100 psi 150F S= 4900 psi 200F S= 4800 psi 250F S= 4700 psi 300F S= 4000 psi 350F S= 3000 psi 400F S= 10,300 psi 100F S= 10,300 psi 150F S= 10,300 psi 200F S= 10,300 psi 250F S= 10,000 psi 300F S= 9,700 psi 350F S= 9,400 psi 400F
1⁄8 3074 2613 2510 2459 2408 2049 1537 * * * * * * *
3⁄16 1935 1645 1581 1548 1516 1290 968 * * * * * * *
1⁄4 1406 1195 1148 1125 1102 938 703 * * * * * * *
5⁄16 1197 1017 977 957 937 798 598 * * * * * * *
3⁄8 984 836 803 787 770 656 492 * * * * * * *
1⁄2 727 618 594 581 569 485 363 * * * * * * *
5⁄8 618 525 504 494 484 412 309 * * * * * * *
3⁄4 511 435 417 409 400 341 256 * * * * * * *
3⁄4 631 537 516 505 495 421 316 * * * * * * *
7⁄8 582 495 475 466 456 388 291 * * * * * * *
11⁄8 494 420 404 395 387 330 247 * * * * * * *
13⁄8 439 373 358 351 344 293 219 * * * * * * *
15⁄8 408 347 334 327 320 272 204 * * * * * * *

Straight Lengths
1⁄4 1159 985 946 927 908 773 579 1989 1989 1989 1989 1931 1873 1815
3⁄8 914 777 747 731 716 609 457 1569 1569 1569 1569 1524 1478 1432
1⁄2 781 664 638 625 612 521 391 1341 1341 1341 1341 1302 1263 1224
5⁄8 723 615 591 579 567 482 362 1242 1242 1242 1242 1206 1169 1133
3⁄4 633 538 517 506 496 422 316 1086 1086 1086 1086 1055 1023 991
7⁄8 583 496 477 467 457 389 292 1002 1002 1002 1002 972 943 914
11⁄8 495 421 404 396 388 330 248 850 850 850 850 825 801 776
13⁄8 440 374 359 352 344 293 220 755 755 755 755 733 711 689
15⁄8 409 348 334 327 320 273 205 702 702 702 702 682 661 641
21⁄8 364 309 297 291 285 243 182 625 625 625 625 607 589 570
25⁄8 336 286 275 269 263 224 168 577 577 577 577 560 544 527
31⁄8 317 270 259 254 249 212 159 545 545 545 545 529 513 497
35⁄8 304 258 248 243 238 203 152 522 522 522 522 506 491 476
41⁄8 293 249 240 235 230 196 147 504 504 504 504 489 474 460

* Not commercially available.
** When brazing or welding is used to join drawn tube, the corresponding annealed rating must be used, see Pressure Ratings and Burst Strength.
*** Based on maximum allowable stress in tension (psi) for the indicated temperatures (°F), see Pressure Ratings and Burst Strength.