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Pipe Size Chart

Free Pipe Marking Chart Common pipe sizes, diameters, wall thickness, and working pressure

Learn more about pipe marking and how these pipe dimensions affect how pipe markers are created and used. Following pipe marking standards will help your facility be code compliant and increase facility safety.

CARBON STEEL PIPE SIZE CHART

Pipe Sizes, Diameters, Wall Thickness, Working Pressure.
Based on ANSI B36.10 and ANSI B36.19

Nom. Size (in) O.D. (in) Schedule Number or Weight Wall Thickness (in) Inside Diameter (in) Pipe Weight (lbs/ft) Working Pressure at 400F (psig)
1/4 0.540 40ST 0.088 0.364 0.424 188
1/4 0.540 80XS 0.119 0.302 0.535 871
3/8 0.675 40ST 0.091 0.493 0.567 203
3/8 0.675 80XS 0.126 0.423 0.738 820
1/2 0.840 40ST 0.109 0.622 0.850 214
1/2 0.840 80XS 0.147 0.546 1.087 753
3/4 1.050 40ST 0.113 0.824 1.13 217
3/4 1.050 80XS 0.154 0.742 1.47 681
1 1.315 40ST 0.133 1.049 1.68 226
1 1.315 80XS 0.179 0.957 2.17 642
1-1/4 1.660 40ST 0.140 1.380 2.27 229
1-1/4 1.660 80XS 0.191 1.278 2.99 594
1-1/2 1.900 40ST 0.145 1.610 2.72 231
1-1/2 1.900 80XS 0.200 1.500 3.63 576
2 2.375 40ST 0.154 2.067 3.65 230
2 2.375 80XS 0.218 1.939 5.02 551
2-1/2 2.875 40ST 0.203 2.469 5.79 533
2-1/2 2.875 80XS 0.276 2.323 7.66 835
3 3.500 40ST 0.216 3.068 7.57 482
3 3.500 80XS 0.300 2.900 10.25 767
4 4.500 40ST 0.237 4.026 10.78 430
4 4.500 80XS 0.337 3.826 14.97 695
Nom. Size (in) O.D. (in) Schedule Number or Weight Wall Thickness (in) Inside Diameter (in) Pipe Weight (lbs/ft) Working Pressure at 400F (psig)
6 6.625 40ST 0.280 6.065 18.96 696
6 6.625 80XS 0.432 5.761 28.55 1209
8 8.625 30 0.277 8.071 24.68 526
8 8.625 40ST 0.322 7.981 28.53 643
8 8.625 80XS 0.500 7.625 43.35 1106
10 10.75 30 0.307 10.136 34.21 485
10 10.75 40ST 0.365 10.202 40.45 606
10 10.75 XS 0.500 9.750 54.69 887
10 10.75 80 0.593 9.564 64.28 1018
12 12.75 30 0.330 12.090 43.74 449
12 12.75 ST 0.375 12.000 49.52 528
12 12.75 40 0.406 11.938 53.48 583
12 12.75 XS 0.500 11.750 65.37 748
12 12.75 80 0.687 11.376 88.44 1076
14 14.00 30ST 0.375 13.250 54.53 481
14 14.00 40 0.437 13.126 63.25 580
14 14.00 XS 0.500 13.000 72.04 681
14 14.00 80 0.750 12.500 106.05 1081
16 16.00 30ST 0.375 15.250 62.53 421
16 16.00 40XS 0.500 15.000 82.71 596
18 18.00 ST 0.375 17.250 70.54 374
18 18.00 30 0.437 17.126 81.91 451
18 18.00 XS 0.500 17.000 93.38 530
18 18.00 40 0.562 16.876 104.59 607
20 20.00 20ST 0.375 19.250 78.54 337
20 20.00 30XS 0.500 19.000 104.05 477
20 20.00 40 0.593 18.814 122.82 581

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