20 inch Sch 40 pipe dimensions & weight
20 inch Sch 40 pipe (DN 500) — dimensions, weight and capacity per ASME B36.10M.
| Nominal size | 20" (DN 500) |
| Schedule | Sch 40 |
| Outside diameter | 508.0 mm (20.000 in) |
| Wall thickness | 15.09 mm (0.594 in) |
| Inside diameter | 477.82 mm (18.812 in) |
| Weight — carbon steel | 183.42 kg/m · 123.26 lb/ft |
| Weight — SS 304 / SS 316 | 185.29 / 186.46 kg/m |
| 6 m length (CS) | 1100.5 kg |
| 20 ft length (CS) | 1118.1 kg |
| Flow area | 1793.16 cm² |
| Water capacity | 179.316 L/m |
| Outer surface (painting) | 1.5959 m²/m |
| Approx. max. working pressure* | 73 bar (1,062 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 20": Sch 10S · Sch 80 · Sch 160 · all 20" schedules
Frequently asked questions
What is the ID of 20 inch Sch 40 pipe?
477.82 mm (18.812 in), with OD 508.0 mm and wall 15.09 mm.
What is the weight of 20 inch Sch 40 pipe?
183.42 kg/m (123.26 lb/ft) in carbon steel; 1100.5 kg per 6 m length.
What pressure can 20 inch Sch 40 pipe take?
Roughly 73 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