12 inch Sch 80 pipe dimensions & weight
12 inch Sch 80 pipe (DN 300) — dimensions, weight and capacity per ASME B36.10M.
| Nominal size | 12" (DN 300) |
| Schedule | Sch 80 |
| Outside diameter | 323.9 mm (12.752 in) |
| Wall thickness | 17.48 mm (0.688 in) |
| Inside diameter | 288.94 mm (11.376 in) |
| Weight — carbon steel | 132.08 kg/m · 88.76 lb/ft |
| Weight — SS 304 / SS 316 | 133.43 / 134.27 kg/m |
| 6 m length (CS) | 792.5 kg |
| 20 ft length (CS) | 805.2 kg |
| Flow area | 655.70 cm² |
| Water capacity | 65.570 L/m |
| Outer surface (painting) | 1.0176 m²/m |
| Approx. max. working pressure* | 135 bar (1,963 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 12": Sch 10S · Sch 40 · Sch 160 · XXS · all 12" schedules
Frequently asked questions
What is the ID of 12 inch Sch 80 pipe?
288.94 mm (11.376 in), with OD 323.9 mm and wall 17.48 mm.
What is the weight of 12 inch Sch 80 pipe?
132.08 kg/m (88.76 lb/ft) in carbon steel; 792.5 kg per 6 m length.
What pressure can 12 inch Sch 80 pipe take?
Roughly 135 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