Schedule 80 pipe dimensions: OD, wall thickness, ID and weight
Deskely Completions team Singapore
Schedule 80 is the heavy wall schedule most used where pressure, corrosion or mechanical load call for more than schedule 40. Up to NPS 8 it is the same wall as XS (extra strong); from NPS 10 up it is thicker than XS.
The chart below gives every size in schedule 80, from NPS 1/8 to 24: outside diameter, wall thickness, inside diameter and the weight of plain-end carbon steel pipe, in mm and inches.
- Sch 80 is a wall thickness that changes with size: 5.54 mm on NPS 2, 8.56 mm on NPS 4.
- The outside diameter is fixed for each NPS, so a heavier schedule only changes the bore.
- Typical use: higher pressure process lines.
- Weights are for plain-end carbon steel; stainless steel is about 2 percent heavier.
Schedule 80 pipe chart
Click a size for every schedule of that size. Dimensions are nominal, per ASME B36.10M.
| NPS | DN | OD mm (in) | Wall mm (in) | ID mm (in) | kg/m (lb/ft) |
|---|---|---|---|---|---|
| 1/8 | 6 | 10.3 (0.405) | 2.41 (0.095) | 5.48 (0.216) | 0.47 (0.32) |
| 1/4 | 8 | 13.7 (0.540) | 3.02 (0.119) | 7.66 (0.302) | 0.80 (0.53) |
| 3/8 | 10 | 17.1 (0.675) | 3.20 (0.126) | 10.70 (0.421) | 1.10 (0.74) |
| 1/2 | 15 | 21.3 (0.840) | 3.73 (0.147) | 13.84 (0.545) | 1.62 (1.09) |
| 3/4 | 20 | 26.7 (1.050) | 3.91 (0.154) | 18.88 (0.743) | 2.20 (1.48) |
| 1 | 25 | 33.4 (1.315) | 4.55 (0.179) | 24.30 (0.957) | 3.24 (2.18) |
| 1-1/4 | 32 | 42.2 (1.660) | 4.85 (0.191) | 32.50 (1.280) | 4.47 (3.00) |
| 1-1/2 | 40 | 48.3 (1.900) | 5.08 (0.200) | 38.14 (1.502) | 5.41 (3.64) |
| 2 | 50 | 60.3 (2.375) | 5.54 (0.218) | 49.22 (1.938) | 7.48 (5.03) |
| 2-1/2 | 65 | 73 (2.875) | 7.01 (0.276) | 58.98 (2.322) | 11.41 (7.67) |
| 3 | 80 | 88.9 (3.500) | 7.62 (0.300) | 73.66 (2.900) | 15.27 (10.26) |
| 3-1/2 | 90 | 101.6 (4.000) | 8.08 (0.318) | 85.44 (3.364) | 18.64 (12.52) |
| 4 | 100 | 114.3 (4.500) | 8.56 (0.337) | 97.18 (3.826) | 22.32 (15.00) |
| 5 | 125 | 141.3 (5.563) | 9.53 (0.375) | 122.24 (4.813) | 30.97 (20.81) |
| 6 | 150 | 168.3 (6.625) | 10.97 (0.432) | 146.36 (5.762) | 42.56 (28.60) |
| 8 | 200 | 219.1 (8.625) | 12.70 (0.500) | 193.70 (7.626) | 64.64 (43.44) |
| 10 | 250 | 273.1 (10.750) | 15.09 (0.594) | 242.92 (9.564) | 96.02 (64.52) |
| 12 | 300 | 323.8 (12.750) | 17.48 (0.688) | 288.84 (11.372) | 132.05 (88.73) |
| 14 | 350 | 355.6 (14.000) | 19.05 (0.750) | 317.50 (12.500) | 158.11 (106.25) |
| 16 | 400 | 406.4 (16.000) | 21.44 (0.844) | 363.52 (14.312) | 203.54 (136.78) |
| 18 | 450 | 457 (18.000) | 23.83 (0.938) | 409.34 (16.116) | 254.57 (171.06) |
| 20 | 500 | 508 (20.000) | 26.19 (1.031) | 455.62 (17.938) | 311.19 (209.11) |
| 24 | 600 | 610 (24.000) | 30.96 (1.219) | 548.08 (21.578) | 442.11 (297.08) |
Mill tolerances apply, and the pipe specification and purchase order for your project take precedence over this chart.
How to work out the inside diameter and weight
The inside diameter is the outside diameter minus twice the wall thickness. The weight per metre of plain-end carbon steel pipe is:
W (kg/m) = 0.0246615 x (OD - t) x t, with OD and wall thickness t in mm. For NPS 4 Sch 80: 0.0246615 x (114.3 - 8.56) x 8.56 = 22.32 kg/m.
Where Sch 80 pipe is used
Higher pressure process lines, small-bore branches and drains, threaded connections that lose wall to the thread, and lines with a corrosion allowance.
Schedule 40 has a thinner wall at the same outside diameter, so it is lighter and has a larger bore, but takes less pressure.
Every schedule in one chart
To compare schedules side by side, or look up a size in any schedule, use the full pipe schedule chart. Other schedules:
The Deskely products for this
Frequently asked questions
What is the wall thickness of Sch 80 pipe?
It depends on the size. NPS 1/2: 3.73 mm, NPS 1: 4.55 mm, NPS 2: 5.54 mm, NPS 4: 8.56 mm, NPS 6: 10.97 mm, NPS 8: 12.70 mm, NPS 12: 17.48 mm. See the chart for every size.
What is the inside diameter of 2 inch Sch 80 pipe?
49.2 mm (1.938 in), from an outside diameter of 60.3 mm and a wall of 5.54 mm.
How much does 4 inch Sch 80 pipe weigh?
22.32 kg/m (15.00 lb/ft) for plain-end carbon steel.
How does Sch 80 compare with other schedules?
Schedule 40 has a thinner wall at the same outside diameter, so it is lighter and has a larger bore, but takes less pressure.
Is the outside diameter the same for every schedule?
Yes. For each NPS the outside diameter is fixed so that fittings and flanges fit; only the wall thickness and so the bore change with the schedule.
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