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TABLE 3a.  Rated Internal Working Pressure for Copper Tube:  TYPE K*

  Annealed Drawn**
Nominal
or
Standard
Size in		 S=
6000
psi
100f		 S=
5100
psi
150f		 S=
4800
psi
200f		 S=
4800
psi
250f		 S=
4700
psi
300f 		S=
4000
psi
350f		 S=
3000
psi
400f		 S=
9000
psi
100f		 S=
9000
psi
150f		 S=
9000
psi
200f		 S=
9000
psi
250f		 S=
8700
psi
300f		 S=
8500
psi
350f		 S=
8200
psi
400f
1/4 1074 913 860 860 842 716 537 1612 1612 1612 1612 1558 1522 1468
3/8 1130 960 904 904 885 753 565 1695 1695 1695 1695 1638 1601 1544
1/2 891 758 713 713 698 594 446 1337 1337 1337 1337 1293 1263 1218
5/8 736 626 589 589 577 491 368 1104 1104 1104 1104 1067 1043 1006
3/4 852 724 682 682 668 568 426 1278 1278 1278 1278 1236 1207 1165
1 655 557 524 524 513 437 327 982982 982 982 982 949 928 895
1-1/4 532 452 425 425 416 354 266 797 797 797 797 771 753 727
1-1/2 494 420 396 396 387 330 247 742 742 742 742 717 700 676
2 435 370 348 348 341 290 217 652 652 652 652 630 616 594
2-1/2 398 338 319 319 312 265 199 597 597 597 597 577 564 544
3 385 328 308 308 302 257 193 578 578 578 578 599 546 527
3-1/2 366 311 293 293 286 244 183 549 549 549 549 530 518 500
4 360 306 288 288 282 240 180 540 540 540 540 522 510 492
5 345 293 276 276 270 230 172 517 517 517 517 500 488 471
6 346 295 277 277 271 231 173 520 520 520 520 502 491 474
8 369 314 295 295 289 246 184 553 553 553 553 535 523 504
10 369 314 295 295 289 246 184 553 553 553 553 535 523 504
12 370 314 296 296 290 247 185 555 555 555 555 536 524 506

NOTES:
*     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.

Table used with permission of Copper Development Association - 260 Madison Ave - New York, NY 10016
 
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