Schedule 80 steel pipe refers to a wall thickness classification defined by the American National Standards Institute (ANSI) and the American Society of Mechanical Engineers (ASME). The actual wall thickness of Schedule 80 pipe depends on its nominal pipe size (NPS) — the larger the diameter, the thicker the wall in absolute terms.
Here’s a quick breakdown (common sizes):
|
Nominal Pipe Size (NPS) |
Outside Diameter (OD) |
Schedule 80 Wall Thickness |
|
1/2" |
0.84 in (21.34 mm) |
0.147 in (3.73 mm) |
|
1" |
1.315 in (33.40 mm) |
0.179 in (4.55 mm) |
|
2" |
2.375 in (60.33 mm) |
0.218 in (5.54 mm) |
|
4" |
4.500 in (114.30 mm) |
0.337 in (8.56 mm) |
|
6" |
6.625 in (168.28 mm) |
0.432 in (10.97 mm) |
|
8" |
8.625 in (219.08 mm) |
0.500 in (12.70 mm) |
|
12" |
12.750 in (323.85 mm) |
0.688 in (17.48 mm) |
In general, Schedule 80 pipes are much thicker and stronger than Schedule 40 pipes of the same nominal size, which makes them suitable for high-pressure and high-temperature applications such as chemical processing, power plants, and heavy industry.
