12 inch pipe (DN 300): outside diameter, wall thickness and weight by schedule
A 12 inch pipe (DN 300) has a 323.8 mm (12.750 in) outside diameter in every schedule: what changes is the wall, and with it the inside diameter and the weight. Designations that give the same wall share a row.
| Schedule | Wall | ID | Weight |
|---|---|---|---|
| Sch 5 / 5S | 3.96 mm (0.156 in) | 315.88 mm (12.438 in) | 31.24 kg/m (21.00 lb/ft) |
| Sch 10 / 10S | 4.57 mm (0.180 in) | 314.66 mm (12.390 in) | 35.98 kg/m (24.19 lb/ft) |
| Sch 20 | 6.35 mm (0.250 in) | 311.10 mm (12.250 in) | 49.71 kg/m (33.41 lb/ft) |
| Sch 30 | 8.38 mm (0.330 in) | 307.04 mm (12.090 in) | 65.19 kg/m (43.81 lb/ft) |
| STD / 40S | 9.53 mm (0.375 in) | 304.74 mm (12.000 in) | 73.86 kg/m (49.61 lb/ft) |
| Sch 40 | 10.31 mm (0.406 in) | 303.18 mm (11.938 in) | 79.71 kg/m (53.57 lb/ft) |
| XS / 80S | 12.70 mm (0.500 in) | 298.40 mm (11.750 in) | 97.44 kg/m (65.48 lb/ft) |
| Sch 60 | 14.27 mm (0.562 in) | 295.26 mm (11.626 in) | 108.93 kg/m (73.22 lb/ft) |
| Sch 80 | 17.48 mm (0.688 in) | 288.84 mm (11.374 in) | 132.05 kg/m (88.71 lb/ft) |
| Sch 100 | 21.44 mm (0.844 in) | 280.92 mm (11.062 in) | 159.87 kg/m (107.42 lb/ft) |
| Sch 120 / XXS | 25.40 mm (1.000 in) | 273.00 mm (10.750 in) | 186.92 kg/m (125.61 lb/ft) |
| Sch 140 | 28.58 mm (1.125 in) | 266.64 mm (10.500 in) | 208.08 kg/m (139.81 lb/ft) |
| Sch 160 | 33.32 mm (1.312 in) | 257.16 mm (10.126 in) | 238.69 kg/m (160.42 lb/ft) |
Plain-end weight of carbon steel pipe, by the standard's own formula: 10.69 × (D − t) × t in lb/ft, with D and t in inches (0.0246615 × (D − t) × t in kg/m, in mm). Austenitic stainless weighs about 2% more.
Lay out on 12 inch pipe
The outside diameter and the wall of the chosen schedule go to the calculator, which opens with them filled in and draws without an account.
Questions
- What is the outside diameter of 12 inch pipe?
- 323.8 mm (12.750 in), in any schedule: it is the DN 300 pipe of ASME B36.10M. The wall changes with the schedule, and the inside diameter with it.
- What is the wall thickness of 12 inch schedule 40 pipe?
- 10.31 mm (0.406 in), with an inside diameter of 303.18 mm (11.938 in); carbon steel pipe weighs 79.71 kg/m (53.57 lb/ft).
- What is the difference between schedule 40 and 80 in 12 inch pipe?
- The wall: 10.31 mm (0.406 in) in schedule 40 and 17.48 mm (0.688 in) in 80. The outside diameter is the same, so schedule 80 has the smaller bore -- 288.84 mm (11.374 in) against 303.18 mm (11.938 in) -- and weighs 132.05 kg/m (88.71 lb/ft) against 79.71 kg/m (53.57 lb/ft).
Printable template
12 inch pipe saddle and mitre templates at full size (PDF)
Flanges for 12 inch pipe
By schedule
- Schedule 5
- Schedule 5S
- Schedule 10
- Schedule 10S
- Schedule 20
- Schedule 30
- Schedule 40
- STD
- Schedule 40S
- Schedule 60
- Schedule 80
- XS
- Schedule 80S
- Schedule 100
- Schedule 120
- Schedule 140
- Schedule 160
- XXS