In pipeline standards, Schedule 80 is an indicator of pipe wall thickness, which is usually thicker than Schedule 40 and Schedule 20 pipes. For API 5L B-grade Schedule 80 pipe, if you want to know the exact wall thickness at a given nominal pipe diameter (NPS), you must refer to the corresponding standard specifications.
The American Petroleum Institute (API) has developed a series of standards for steel pipes for the oil and gas industry, and API 5L is one of them. In the API 5L standard system, there are clear regulations on the wall thickness of steel pipes, especially the wall thickness of Schedule 80 pipes of a specific NPS of API5L Grade B.
Take the common API 5L B-grade Schedule (SCH) 80 pipe with NPS 2 (2-inch nominal pipe size) as an example. Its wall thickness is specified in the API 5L specification. However, if we are separated from the specific content of the standard, we cannot know the exact wall thickness value.
Outer Diameter&Wall Thickness
| ( ANSI B36.10 B36.19M) Outside Diameter amd Wall Thickness | |||||||||||||||||||
| NPS | OD | Norminal Wall Thickness | |||||||||||||||||
| INCH | DN | MM | 5s | 10s | 10 | 20 | 30 | 40s | STD | 40 | 60 | 80s | XS | 80 | 100 | 120 | 140 | 160 | XXS |
| 0.125 | 6 | 10.3 | - | 1.24 | - | - | - | 1.73 | 1.73 | 1.73 | - | 2.41 | 2.41 | 2.41 | - | - | - | - | - |
| 0.25 | 8 | 13.7 | - | 1.65 | - | - | - | 2.24 | 2.24 | 2.24 | - | 3.02 | 3.02 | 3.02 | - | - | - | - | - |
| 0.375 | 10 | 17.1 | - | 1.65 | - | - | - | 2.31 | 2.31 | 2.31 | - | 3.2 | 3.2 | 3.2 | - | - | - | - | - |
| 0.5 | 15 | 21.3 | 1.65 | 2.11 | - | - | - | 2.77 | 2.77 | 2.77 | - | 3.73 | 3.73 | 3.73 | - | - | - | 4.78 | 7.47 |
| 0.75 | 20 | 26.7 | 1.65 | 2.11 | - | - | - | 2.87 | 2.87 | 2.87 | - | 3.91 | 3.91 | 3.91 | - | - | - | 5.56 | 7.82 |
| 1 | 25 | 33.4 | 1.65 | 2.77 | - | - | - | 3.38 | 3.38 | 3.38 | - | 4.55 | 4.55 | 4.55 | - | - | - | 6.35 | 9.09 |
| 1.25 | 32 | 42.2 | 1.65 | 2.77 | - | - | - | 3.56 | 3.56 | 3.56 | - | 4.85 | 4.85 | 4.85 | - | - | - | 6.35 | 9.7 |
| 1.5 | 40 | 48.3 | 1.65 | 2.77 | - | - | - | 3.68 | 3.68 | 3.68 | - | 5.08 | 5.08 | 5.08 | - | - | - | 7.14 | 10.15 |
| 2 | 50 | 60.3 | 1.65 | 2.77 | - | - | - | 3.91 | 3.91 | 3.91 | - | 5.54 | 5.54 | 5.54 | - | - | - | 8.74 | 11.07 |
| 2.5 | 65 | 73 | 2.11 | 3.05 | - | - | - | 5.16 | 5.16 | 5.16 | - | 7.01 | 7.01 | 7.01 | - | - | - | 9.53 | 14.02 |
| 3 | 80 | 88.9 | 2.11 | 3.05 | - | - | - | 5.49 | 5.49 | 5.49 | - | 7.62 | 7.62 | 7.62 | - | - | - | 11.13 | 15.24 |
| 3.5 | 90 | 101.6 | 2.11 | 3.05 | - | - | - | 5.74 | 5.74 | 5.74 | - | 8.08 | 8.08 | 8.08 | - | - | - | - | - |
| 4 | 100 | 114.3 | 2.11 | 3.05 | - | - | - | 6.02 | 6.02 | 6.02 | - | 8.56 | 8.56 | 8.56 | - | 11.13 | - | 13.49 | 17.12 |
| 5 | 125 | 141.3 | 2.77 | 3.4 | - | - | - | 6.55 | 6.55 | 6.55 | - | 9.53 | 9.53 | 9.53 | - | 12.7 | - | 15.88 | 19.05 |
| 6 | 150 | 168.3 | 2.77 | 3.4 | - | - | - | 7.11 | 7.11 | 7.11 | - | 10.97 | 10.97 | 10.97 | - | 14.27 | - | 18.26 | 21.95 |
| 8 | 200 | 219.1 | 2.77 | 3.76 | - | 6.35 | 7.04 | 8.18 | 8.18 | 8.18 | 10.31 | 12.7 | 12.7 | 12.7 | 15.09 | 18.26 | 20.62 | 23.01 | 22.23 |
| 10 | 250 | 273.1 | 3.4 | 4.19 | - | 6.35 | 7.8 | 9.27 | 9.27 | 9.27 | 12.7 | 12.7 | 12.7 | 15.09 | 18.26 | 21.44 | 25.4 | 28.58 | 25.4 |
| 12 | 300 | 323.9 | 3.96 | 4.57 | - | 6.35 | 8.38 | 9.53 | 9.53 | 10.31 | 14.27 | 12.7 | 12.7 | 17.48 | 21.44 | 25.4 | 28.58 | 33.32 | 25.4 |
| 14 | 350 | 355.6 | 3.96 | 4.78 | 6.35 | 7.92 | 9.53 | - | 9.53 | 11.13 | 15.09 | - | 12.7 | 19.05 | 23.83 | 27.79 | 31.75 | 35.71 | - |
| 16 | 400 | 406.4 | 4.19 | 4.78 | 6.35 | 7.92 | 9.53 | - | 9.53 | 12.7 | 16.66 | - | 12.7 | 21.44 | 26.19 | 30.96 | 36.53 | 40.49 | - |
| 18 | 450 | 457.2 | 4.19 | 4.78 | 6.35 | 7.92 | 11.13 | - | 9.53 | 14.27 | 19.05 | - | 12.7 | 23.83 | 29.36 | 34.96 | 39.67 | 45.24 | - |
| 20 | 500 | 508 | 4.78 | 5.54 | 6.35 | 9.53 | 12.7 | - | 9.53 | 15.09 | 20.62 | - | 12.7 | 26.19 | 32.54 | 38.1 | 44.45 | 50.01 | - |
| 22 | 550 | 558.8 | 4.78 | 5.54 | 6.35 | 9.53 | 12.7 | - | 9.53 | - | 22.23 | - | 12.7 | 28.58 | 34.93 | 41.28 | 47.63 | 53.98 | - |
| 24 | 600 | 609.6 | 5.54 | 6.35 | 6.35 | 9.53 | 14.27 | - | 9.53 | 17.48 | 24.61 | - | 12.7 | 30.96 | 38.89 | 46.02 | 52.37 | 59.54 | - |
| 26 | 650 | 660.4 | - | - | 7.92 | 12.7 | - | - | 9.53 | - | - | - | 12.7 | - | - | - | - | - | - |
| 28 | 700 | 711.2 | - | - | 7.92 | 12.7 | 15.88 | - | 9.53 | - | - | - | 12.7 | - | - | - | - | - | - |
| 30 | 750 | 762 | 6.35 | 7.92 | 7.92 | 12.7 | 15.88 | - | 9.53 | - | - | - | 12.7 | - | - | - | - | - | - |
| 32 | 800 | 812.8 | - | - | 7.92 | 12.7 | 15.88 | - | 9.53 | 17.48 | - | - | 12.7 | - | - | - | - | - | - |
| 34 | 850 | 863.6 | - | - | 7.92 | 12.7 | 15.88 | - | 9.53 | 17.48 | - | - | 12.7 | - | - | - | - | - | - |
| 36 | 900 | 914.4 | - | - | 7.92 | 12.7 | 15.88 | - | 9.53 | 19.05 | - | - | 12.7 | - | - | - | - | - | - |
| 38 | 950 | 965.2 | - | - | - | - | - | - | 9.53 | - | - | - | 12.7 | - | - | - | - | - | - |
| 40 | 1000 | 1016 | - | - | - | - | - | - | 9.53 | - | - | - | 12.7 | - | - | - | - | - | - |
| 42 | 1050 | 1066.8 | - | - | - | - | - | - | 9.53 | - | - | - | 12.7 | - | - | - | - | - | - |
| 44 | 1100 | 1117.6 | - | - | - | - | - | - | 9.53 | - | - | - | 12.7 | - | - | - | - | - | - |
| 46 | 1150 | 1168.4 | - | - | - | - | - | - | 9.53 | - | - | - | 12.7 | - | - | - | - | - | - |
| 48 | 1200 | 1219.2 | - | - | - | - | - | - | 9.53 | - | - | - | 12.7 | - | - | - | - | - | - |
| 52 | 1300 | 1321 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 56 | 1400 | 1422 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 60 | 1500 | 1524 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 64 | 1600 | 1626 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 68 | 1700 | 1727 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 72 | 1800 | 1829 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 76 | 1900 | 1930 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 80 | 2000 | 2032 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
