Theoretical Bursting And Bulging Pressures For Tubing

Corresponding to a fiber stress in wall of 10,000 pounds per square inch

Outside Diameter Inches Wall Thickness Decimal-Inch
BWG Equivalent Fraction Equivalent
.020 .028 .035 .049 .065 .095 .120 .156 .187 .210 .250 .313 .375 .500 .625 .750 .575 1.000
25 22 20 18 16 13 11 lt;/td> 5/32" 3/16" 7/32" 1/4" 5/16" 3/8" 1/2" 5/8" 3/4" 7/8" 1
1/8 3200 5200 5600 7840
3/16 2133 3587 3933 5227
1/16 1600 2240 2800 3920 5200 7600
5/16 1280 1792 2240 3136 4160 6100
3/8 1067 1493 1867 2613 3467 5067 6400
1/2 800 1120 1400 1960 2600 3800 4800 6240 7480
5/8 640 896 1120 1568 2080 3040 3840 4992 5984 7008
3/4 533 747 933 1307 1733 2533 3200 4160 4987 5840 6667
3/4 457 640 800 1120 1486 2171 2743 3566 4274 5006 5714 7154
1 400 560 700 980 1300 1900 2400 3120 3740 4380 5000 6260 7500
11/8 355 498 622 871 1156 1689 2133 2773 3324 3893 4444 5564 6667
11/4 320 448 560 784 1040 1520 1920 2496 2992 3504 4000 5008 6000 8000
13/8 290 407 509 713 945 1382 1745 2269 2720 3185 3536 4553 5455 7273
11/2 267 393 467 653 867 1267 1600 2080 2493 2920 3333 4173 5000 6667 8333
13/4 229 318 400 560 743 1086 1371 1783 2137 2503 2857 3577 4286 5714 7143
2 200 280 350 490 650 950 1200 1560 1870 2190 2500 3130 3750 5000 6250 7500
21/4 178 250 311 436 578 844 1067 1387 1662 1947 2222 2872 3333 4444 5556 6667
21/4 280 392 520 760 960 1248 1496 1752 2000 2504 3000 4000 5000 6000 7000
23/4 255 356 473 691 873 1135 1360 1593 1818 2276 2727 3636 4545 5455 6364 7273
3 327 433 633 800 1040 1247 1460 1667 2087 2500 3333 4167 5000 5833 6667
31/4 302 400 585 738 960 1151 1348 1538 1926 2308 3077 3846 4615 5385 6154
31/2 280 371 543 686 891 1069 1251 1429 1789 2143 2857 3571 4286 5000 5714
33/4 261 347 507 640 832 997 1168 1333 1669 2000 2667 3333 4000 4667 5333
4 245 325 475 600 780 935 1095 1250 1566 1875 2500 3125 3750 4375 5000
41/4 306 447 565 734 880 1031 1176 1473 1765 2353 2941 3529 4118 4706
41/2 289 412 533 693 831 973 1111 1391 1667 2222 2778 3333 3889 4444
43/4 274 400 505 657 787 922 1053 1318 1579 2105 2632 3158 3684 4211
5 260 380 480 624 748 876 1000 1252 1500 2000 2500 3000 3500 4000
51/2 345 436 567 680 796 909 1138 1364 1818 2273 2727 3182 3636
6 317 400 520 623 730 833 1043 1250 1667 2083 2500 2917 3333
61/2 369 480 575 674 769 693 1154 1538 1923 2308 2692 3077
7 446 534 626 714 894 1071 1429 1786 2143 2500 2857
71/2 416 499 584 667 835 1000 1333 1667 2000 2333 2667
8 468 548 625 783 938 1250 1563 1875 2180 2500
81/2 515 588 736 882 1176 1471 1765 2059 2353
9 556 696 833 1111 1389 1667 1944 2222
91/2 526 659 789 1053 1316 1579 1842 2105
10 500 626 750 1000 1250 1500 1750 2000
101/2 476 596 714 952 1190 1429 1667 1905

The above table is based on the best known and most widely used formula for calculating the bursting pressure of tubes, namely Barlowís:

P=2St/D

P = Internal pressure in p.s.i. S = Fiber stress of tube in p.s.i. t = Wall thickness in inches D = Outside diameter in inches

The table (S = 10,000) affords easy calculations with appropriate multipliers shown below. For theoretical bursting pressures, use tensile values. For theoretical bulging pressures, use yield values. Working pressures will vary depending upon safety factors required for environmental conditions involved as determined by your design engineer and appropriate codes. Material Tensile (Multiplier) Yield (Multiplier)
6061-T6 Aluminum 42,000 psi (x 4.2) 35,000 psi (x 3.5)
Annealed Low Carbon Steel 55,000 psi (x 5.5) 25,000 psi (x 2.5)
Annealed 18-8 Stainless 75,000 psi (x 7.5) 30,000 psi (x 3.0)
1/8 Hard 18-8 Stainless 105,000 psi (x 10.5) 75,000 psi (x 7.5)
Cold Dr. 21-6-9 Stainless 142,000 psi (x 14.2) 120,000 psi (x 12.0)

The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes.

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