Steel Pipes : Available Wall Thicknesses

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There are three different sources of Pipe Wall Thicknesses :-

  1. The American National Standards Institute (ANSI) : Schedule Numbers.
  2. The American Society of Mechanical Engineers (ASME) and the American Society for Testing and Materials (ASTM) : Wall Thicknesses  ‘STD’ (standard), ‘XS’ (extra-strong), and ‘XXS’ (double-extra-strong),  They are as per dimensions established by manufacturers. Also termed ‘manufacturers’ weights’.
  3. The American Petroleum Institute(API) : Standard 5L, for ‘Line pipe’. Dimensions in this standard have no references for individual sizes and wall thicknesses.

Manufacturer’s weight standards were supposed to be superceded by Schedule Numbers long time back. But demand for those wall thicknesses in process industry casued pipe manufacturers to continue their production. Certain fittings are available only in manufacturers’ weights. Pipe dimensions from the ASME/ASTM and API  are included in American National Standard B36.10M.

Initially schedule numbers used to establish pipe wall thicknesses by formula, but as wall thicknesses in common use continued to depart from those proposed by the scheme. So schedule numbers now identify wall thicknesses of pipe in the different nominal sizes as ANSI B36.10M states as a convenient designation system for use in ordering”.

LIST of Wall Thicknesses for Carbon Steel Pipes

  1. Light Wall
  2. Schedule 10 (Sch/10, S/10)
  3. Schedule 20 (Sch/20, S/20)
  4. Schedule 30 (Sch/30, S/30)
  5. Schedule 40 (Sch/40, S/40)
  6. Standard Weight (ST, Std, STD)
  7. Schedule 60 (Sch/60, S/60)
  8. Extra Strong (Extra Heavy, EH, XH, XS)
  9. Schedule 80 (Sch/80, S/80)
  10. Schedule 100 (Sch/100, S/100)
  11. Schedule 120 (Sch/120, S/120)
  12. Schedule 140 (Sch/140, S/140)
  13. Schedule 160 (Sch/160, S/160)
  14. Double Extra Strong (Double extra heavy, XXH, XXS)
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LIST of Wall Thicknesses for Stainless Steel Pipes

American National Standard B3B.19 established a range of thin-walled sizes for stainless-steel pipe, indentified by schedules 5S and 10S

  1. Schedule 5S (Sch/5S, S/5S)
  2. Schedule 10S (Sch/10S, S/10S)
  3. Schedule 40S (Sch/40S, S/40S)
  4. Schedule 80S (Sch/80S, S/80S)

Pipe Wall Thickness Chart

NPS
inches
N.D. O.D.
mm
10 20 30 STD 40 60 XS 80 100 120 140 160 XXS
1/8 10.3 1.24 1.45 1.73 1.73 2.41 2.41
1/4 6 13.7 1.65 1.85 2.24 2.24 3.02 3.02
3/8 10 17.1 1.65 1.85 2.31 2.31 3.2 3.2
1/2 15 21.34 2.11 2.41 2.77 2.77 3.73 3.73 4.77 7.47
3/4 20 26.67 2.11 2.41 2.87 2.87 3.91 3.91 5.56 7.82
1 25 33.4 2.77 2.90 3.38 3.38 4.55 4.55 6.35 9.09
1.1/4 32 42.16 2.77 2.97 3.56 3.56 4.85 4.85 6.35 9.7
1.1/2 40 48.26 2.77 3.18 3.68 3.68 5.08 5.08 7.14 10.16
2 50 60.32 2.77 3.18 3.91 3.91 5.54 5.54 8.74 11.07
2.1/2 65 73.02 3.05 4.78 5.16 5.16 7.01 7.01 9.52 14.02
3 80 88.9 3.05 4.78 5.49 5.49 7.62 7.62 11.12 15.24
3.1/2 90 101.6 3.05 4.78 5.74 5.74 8.08 8.08 16.15
4 100 114.3 3.05 4.78 6.02 6.02 8.56 8.56 11.12 13.49 17.12
5 125 141.3 3.40 6.55 6.55 9.52 9.52 12.7 15.87 19.05
6 150 168.3 3.40 7.11 7.11 10.97 10.97 14.27 18.26 21.95
8 200 219.1 3.76 6.35 7.04 8.18 8.18 10.31 12.7 12.7 15.08 18.26 20.63 23.01 22.22
10 250 273 4.19 6.35 7.80 9.27 9.27 12.7 12.7 15.08 18.26 21.44 25.4 28.57 25.4
12 300 323.9 4.57 6.35 8.38 9.52 10.31 14.27 12.7 17.47 21.44 25.4 28.57 33.32 25.4
14 350 355.6 6.35 7.92 9.53 9.52 11.12 15.09 12.7 19.05 23.82 27.79 31.75 35.71
16 400 406.4 6.35 7.92 9.53 9.52 12.7 16.66 12.7 21.44 26.19 30.96 36.52 40.49
18 450 457.2 6.35 7.92 11.13 9.52 14.27 19.05 12.7 23.82 29.36 34.92 39.67 45.24
20 500 508 6.35 9.53 12.70 9.52 15.08 20.62 12.7 26.19 32.54 38.1 44.45 50.01
22 550 558.8 6.35 9.53 12.70 9.52 15.87 22.22 12.7 28.57 34.92 41.27 47.62 53.97
24 600 609.6 6.35 9.53 12.70 9.52 17.47 24.61 12.7 30.96 38.89 46.02 52.37 59.54
26 650 660.4 7.92 12.70 9.52 12.7
28 700 711.2 7.92 12.70 15.88 9.52 12.7
30 750 762 7.92 12.70 15.88 9.52 12.7
32 800 812.8 7.92 12.70 15.88 9.52 17.47 12.7
34 850 863.6 7.92 12.70 15.88 9.52 17.47 12.7
36 900 914.4 7.92 12.70 15.88 9.52 19.05 12.7
40 1000 1016 9.53 12.7

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