14 inch pipe dimensions: OD and wall thickness by schedule
Deskely Completions team Singapore
A 14 inch pipe, NPS 14 or DN 350, has an outside diameter of 355.6 mm (14.000 inches) in every schedule. From NPS 14 up the outside diameter in inches equals the nominal size. The schedule sets the wall thickness, and with it the inside diameter and the weight.
The table gives every schedule listed for NPS 14 in ASME B36.10M and B36.19M, in mm and inches.
- Outside diameter: 355.6 mm (14.000 in), the same for every schedule.
- Schedule 40: 11.13 mm wall, 333.3 mm inside diameter.
- Schedule 80: 19.05 mm wall, 317.5 mm inside diameter.
- Metric equivalent: DN 350.
14 inch pipe dimensions by schedule
| Schedule | Wall mm (in) | ID mm (in) | kg/m (lb/ft) |
|---|---|---|---|
| Schedule 5S | 3.96 (0.156) | 347.68 (13.688) | 34.34 (23.08) |
| Schedule 10S | 4.78 (0.188) | 346.04 (13.624) | 41.36 (27.79) |
| Schedule 10 | 6.35 (0.250) | 342.90 (13.500) | 54.69 (36.75) |
| Schedule 20 | 7.92 (0.312) | 339.76 (13.376) | 67.91 (45.63) |
| Schedule 30 | 9.53 (0.375) | 336.54 (13.250) | 81.33 (54.65) |
| STD (standard) | 9.53 (0.375) | 336.54 (13.250) | 81.33 (54.65) |
| Schedule 40 | 11.13 (0.438) | 333.34 (13.124) | 94.55 (63.54) |
| Schedule 60 | 15.09 (0.594) | 325.42 (12.812) | 126.72 (85.15) |
| XS (extra strong) | 12.70 (0.500) | 330.20 (13.000) | 107.40 (72.17) |
| Schedule 80 | 19.05 (0.750) | 317.50 (12.500) | 158.11 (106.25) |
| Schedule 100 | 23.83 (0.938) | 307.94 (12.124) | 194.98 (131.02) |
| Schedule 120 | 27.79 (1.094) | 300.02 (11.812) | 224.66 (150.97) |
| Schedule 140 | 31.75 (1.250) | 292.10 (11.500) | 253.58 (170.39) |
| Schedule 160 | 35.71 (1.406) | 284.18 (11.188) | 281.72 (189.30) |
Nominal dimensions. Weights are for plain-end carbon steel; stainless steel is about 2 percent heavier. Mill tolerances apply, and your project pipe specification takes precedence.
14 inch pipe outside diameter
The outside diameter of NPS 14 pipe is 355.6 mm, or 14.000 inches, whatever the schedule, so 14 inch fittings and flanges fit every wall thickness. In metric drawings and specifications the same size is called DN 350.
Nearby sizes
- 12 inch pipe dimensions: OD 323.8 mm
- 16 inch pipe dimensions: OD 406.4 mm
Every size and schedule in one table: the pipe schedule chart.
The Deskely products for this
Frequently asked questions
What is the OD of 14 inch pipe?
355.6 mm (14.000 inches), the same for every schedule.
What is the wall thickness of 14 inch schedule 40 pipe?
11.13 mm (0.438 in), giving an inside diameter of 333.3 mm (13.124 in).
What is the wall thickness of 14 inch schedule 80 pipe?
19.05 mm (0.750 in), giving an inside diameter of 317.5 mm (12.500 in).
What is 14 inch pipe in DN?
DN 350.
How much does 14 inch schedule 40 pipe weigh?
94.55 kg/m (63.54 lb/ft) for plain-end carbon steel.
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