3-1/2 inch Sch 80 pipe dimensions & weight
3-1/2 inch Sch 80 pipe (DN 90) — dimensions, weight and capacity per ASME B36.10M.
| Nominal size | 3-1/2" (DN 90) |
| Schedule | Sch 80 |
| Outside diameter | 101.6 mm (4.000 in) |
| Wall thickness | 8.08 mm (0.318 in) |
| Inside diameter | 85.44 mm (3.364 in) |
| Weight — carbon steel | 18.63 kg/m · 12.52 lb/ft |
| Weight — SS 304 / SS 316 | 18.82 / 18.94 kg/m |
| 6 m length (CS) | 111.8 kg |
| 20 ft length (CS) | 113.6 kg |
| Flow area | 57.33 cm² |
| Water capacity | 5.733 L/m |
| Outer surface (painting) | 0.3192 m²/m |
| Approx. max. working pressure* | 203 bar (2,948 psi) — A106 Gr B |
*Approximate ASME B31.3 straight-pipe rating at ≤ 38 °C for seamless A106 Gr B (S = 137.9 MPa, E = 1, 12.5% mill tolerance, no corrosion allowance). Use the wall thickness calculator for your own design conditions.
Other schedules for 3-1/2": Sch 10S · Sch 40 · all 3-1/2" schedules
Frequently asked questions
What is the ID of 3-1/2 inch Sch 80 pipe?
85.44 mm (3.364 in), with OD 101.6 mm and wall 8.08 mm.
What is the weight of 3-1/2 inch Sch 80 pipe?
18.63 kg/m (12.52 lb/ft) in carbon steel; 111.8 kg per 6 m length.
What pressure can 3-1/2 inch Sch 80 pipe take?
Roughly 203 bar at ambient for seamless A106 Gr B under ASME B31.3 with no corrosion allowance; actual rating depends on material, temperature and code.
Last updated 2026-11-02