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Pipe Wall Thickness

Pipe Wall Thickness | SPFA
Nominal Size OD Nominal Wall Thickness For Welded & Seamless Wrought Steel Pipe To ASME B36.10 (In Millimeters)
Nominal Wall Thickness For Welded & Seamless Wrought Stainless Steel Pipe To ASME B36.19 (In Millimeters)
DN NPS mm Schedule
5S 10S 10 20 30 40S STD 40 60 80S XS 80 100 120 140 160 XXS
6 1/8 10.3 - 1.24 1.24 - 1.45 1.73 1.73 1.73 - 2.41 2.41 2.41 - - - - -
8 1/4 13.7 - 1.65 1.65 - 1.85 2.24 2.24 2.24 - 3.02 3.02 3.02 - - - - -
10 3/8 17.1 - 1.65 1.65 - 1.85 2.31 2.31 2.31 - 3.20 3.20 3.20 - - - - -
15 1/2 21.3 1.65 2.11 2.11 - 2.41 2.77 2.77 2.77 - 3.73 3.73 3.73 - - - 4.78 7.47
20 3/4 26.7 1.65 2.11 2.11 - 2.41 2.87 2.87 2.87 - 3.91 3.91 3.91 - - - 5.56 7.82
25 1 33.4 1.65 2.77 2.77 - 2.90 3.38 3.38 3.38 - 4.55 4.55 4.55 - - - 6.35 9.09
32 11/4 42.2 1.65 2.77 2.77 - 2.97 3.56 3.56 3.56 - 4.85 4.85 4.85 - - - 6.35 9.70
40 11/2 48.3 1.65 2.77 2.77 - 3.18 3.68 3.68 3.68 - 5.08 5.08 5.08 - - - 7.14 10.15
50 2 60.3 1.65 2.77 2.77 - 3.18 3.91 3.91 3.91 - 5.54 5.54 5.54 - - - 8.74 11.07
65 21/2 73.0 2.11 3.05 3.05 - 4.78 5.16 5.16 5.16 - 7.01 7.01 7.01 - - - 9.53 14.02
80 3 88.9 2.11 3.05 3.05 - 4.78 5.49 5.49 5.49 - 7.62 7.62 7.62 - - - 11.13 15.24
90 31/2 101.6 2.11 3.05 3.05 - 4.78 5.74 5.74 5.74 - 8.08 8.08 8.08 - - - - -
100 4 114.3 2.11 3.05 3.05 - 4.78 6.02 6.02 6.02 - 8.56 8.56 8.56 - 11.13 - 13.49 17.12
125 5 141.3 2.77 3.40 3.40 - - 6.55 6.55 6.55 - 9.53 9.53 9.53 - 12.70 - 15.88 19.05
150 6 168.3 2.77 3.40 3.40 - - 7.11 7.11 7.11 - 10.97 10.97 10.97 - 14.27 - 18.26 21.95
200 8 219.1 2.77 3.76 3.76 6.35 7.04 8.18 8.18 8.18 10.31 12.70 12.70 12.70 15.09 18.26 20.62 23.01 22.23
250 10 273.1 3.40 4.19 4.19 6.35 7.80 9.27 9.27 9.27 12.70 12.70 12.70 15.09 18.26 21.44 25.40 28.58 25.40
300 12 323.9 3.96 4.57 4.57 6.35 8.38 9.53 9.53 10.31 14.27 12.70 12.70 17.48 21.44 25.40 28.58 33.32 25.40
350 14 355.6 3.96 4.78 6.35 7.92 9.53 9.53 9.53 11.13 15.09 12.70 12.70 19.05 23.83 27.79 31.75 35.71 -
400 16 406.4 4.19 4.78 6.35 7.92 9.53 9.53 9.53 12.70 16.66 12.70 12.70 21.44 26.19 30.96 36.53 30.49 -
450 18 457 4.19 4.78 6.35 7.92 11.13 9.53 9.53 14.27 19.05 12.70 12.70 23.83 29.36 34.93 39.67 45.24 -
500 20 508 4.78 5.54 6.35 9.53 12.70 9.53 9.53 15.09 20.62 12.70 12.70 26.19 32.54 38.10 44.45 50.01 -
550 22 559 4.78 5.54 6.35 9.53 12.70 - 9.53 - 22.23 - 12.70 28.58 34.93 41.28 47.63 53.98 -
600 24 610 5.54 6.35 6.35 9.53 14.27 9.53 9.53 17.48 24.61 12.70 12.70 30.96 38.89 46.02 52.37 59.54 -
650 26 660 - - 7.92 12.70 - - 9.53 - - - 12.70 - - - - - -
700 28 711 - - 7.92 12.70 15.88 - 9.53 - - - 12.70 - - - - - -
750 30 762 6.35 7.92 7.92 12.70 15.88 - 9.53 - - - 12.70 - - - - - -
800 32 813 - - 7.92 12.70 15.88 - 9.53 17.48 - - 12.70 - - - - - -
850 34 864 - - 7.92 12.70 15.88 - 9.53 17.48 - - 12.70 - - - - - -
900 36 914 - - 7.92 12.70 15.88 - 9.53 19.05 - - 12.70 - - - - - -

FAQ

What is the significance of pipe wall thickness?

Pipe wall thickness is the measurement of a pipe’s outer diameter minus its inner diameter, divided by two. It is usually expressed in inches or millimetres, and is an important characteristic of a pipe that affects its performance, durability, and structural integrity.

Pipe wall thickness relates to the ability of a pipe to withstand pressure from liquids or gases flowing through it. A thicker wall provides more resistance against pressure, which helps the pipes hold up against high-pressure applications and transport heavy loads. On the other hand, thinner walls are less rigid and provide less resistance against pressure, making them suitable for low-pressure applications.

The minimum allowable wall thickness is set by various national and international standards such as ASTM A999 and ASTM A999M-12. These standards specify the minimum values for different types of materials used in pipe construction, based on factors like material grade and operating conditions. Manufacturers must adhere to these standards when producing pipes to ensure that they meet the specified performance requirements.