3 inch (DN 80) pipe dimensions & weight
3 inch (DN 80) steel pipe has an outside diameter of 88.9 mm (3.500 in) in every schedule. Below: wall thickness, inside diameter, weight per metre and water capacity for each ASME B36.10M / B36.19M schedule.
| Schedule | Wall (mm) | Wall (in) | ID (mm) | CS kg/m | CS lb/ft | SS 304 kg/m | Water L/m |
|---|---|---|---|---|---|---|---|
| Sch 5S | 2.11 | 0.083 | 84.68 | 4.52 | 3.04 | 4.57 | 5.63 |
| Sch 10S | 3.05 | 0.120 | 82.80 | 6.46 | 4.34 | 6.53 | 5.38 |
| STD | 5.49 | 0.216 | 77.92 | 11.29 | 7.59 | 11.41 | 4.77 |
| Sch 40 | 5.49 | 0.216 | 77.92 | 11.29 | 7.59 | 11.41 | 4.77 |
| XS | 7.62 | 0.300 | 73.66 | 15.27 | 10.26 | 15.43 | 4.26 |
| Sch 80 | 7.62 | 0.300 | 73.66 | 15.27 | 10.26 | 15.43 | 4.26 |
| Sch 160 | 11.13 | 0.438 | 66.64 | 21.35 | 14.35 | 21.57 | 3.49 |
| XXS | 15.24 | 0.600 | 58.42 | 27.68 | 18.60 | 27.96 | 2.68 |
CS = carbon steel (7.85 g/cm³). SS 304 at 7.93 g/cm³; for 316 multiply CS weight by 1.017. Water capacity = internal volume per metre.
Matching 3" flanges and fittings
| Class 150 flange | OD 190 mm · thk 22.3 mm · PCD 152.4 mm · 4 × 5/8" bolts |
| Class 300 flange | OD 210 mm · thk 27.0 mm · PCD 168.3 mm · 8 × 3/4" bolts |
| B16.9 fittings | 90° LR 114 mm · 45° LR 51 mm · 90° SR 76 mm · tee 86 mm · reducer 89 mm · cap 51 mm |
Full tables: Class 150 · Class 300 · B16.9 fittings.
Frequently asked questions
What is the OD of 3 inch pipe?
3 inch (DN 80) pipe has an outside diameter of 88.9 mm (3.500 in), regardless of schedule.
What is the wall thickness of 3 inch Schedule 40 pipe?
5.49 mm (0.216 in), giving an inside diameter of 77.92 mm.
How much does 3 inch Schedule 40 pipe weigh?
About 11.29 kg/m (7.59 lb/ft) in carbon steel, or 67.7 kg for a 6 m length.
What is the wall thickness of 3 inch Schedule 80 pipe?
7.62 mm, with an inside diameter of 73.66 mm and weight of 15.27 kg/m.
Last updated 2026-11-02