NPS 16 Pipe Dimensions
Outside diameter 16.000 in (406.4 mm) — fixed across every schedule. 13 wall thicknesses from ASME B36.10M, with bore, plain-end weight and flow area for each.
- Nominal size
- NPS 16
- Metric designator
- DN 400
- Outside diameter
- 16.000 in (406.4 mm)
- Schedules listed
- 13
- Standard weight wall
- 0.375 in (9.5 mm)
- Extra strong wall
- 0.500 in (12.7 mm)
Every schedule in NPS 16
Dimensions are given in inches, with the millimetre equivalent beneath in grey.
| Schedule | Wall thickness | Inside diameter | Weight, empty | Flow area (in²) | Water (US gal/ft) |
|---|---|---|---|---|---|
| Sch 5 | 0.1654.19 mm | 15.670398.02 mm | 27.9041.53 kg/m | 192.85 | 10.018 |
| Sch 10 | 0.1884.78 mm | 15.624396.85 mm | 31.7547.25 kg/m | 191.72 | 9.960 |
| Sch 20 | 0.3127.92 mm | 15.376390.55 mm | 52.2877.79 kg/m | 185.68 | 9.646 |
| Sch 30 | 0.3759.52 mm | 15.250387.35 mm | 62.5893.13 kg/m | 182.65 | 9.489 |
| Sch 40 | 0.50012.70 mm | 15.000381.00 mm | 82.77123.18 kg/m | 176.71 | 9.180 |
| STD | 0.3759.52 mm | 15.250387.35 mm | 62.5893.13 kg/m | 182.65 | 9.489 |
| Sch 60 | 0.65616.66 mm | 14.688373.08 mm | 107.50159.98 kg/m | 169.44 | 8.802 |
| Sch 80 | 0.84421.44 mm | 14.312363.52 mm | 136.62203.31 kg/m | 160.88 | 8.357 |
| XS | 0.50012.70 mm | 15.000381.00 mm | 82.77123.18 kg/m | 176.71 | 9.180 |
| Sch 100 | 1.03126.19 mm | 13.938354.03 mm | 164.83245.29 kg/m | 152.58 | 7.926 |
| Sch 120 | 1.21930.96 mm | 13.562344.47 mm | 192.44286.38 kg/m | 144.46 | 7.504 |
| Sch 140 | 1.43836.53 mm | 13.124333.35 mm | 223.65332.82 kg/m | 135.28 | 7.027 |
| Sch 160 | 1.59440.49 mm | 12.812325.42 mm | 245.25364.97 kg/m | 128.92 | 6.697 |
Weight is calculated for carbon steel as w = 10.6802 × t × (OD − t) lb/ft and is the plain-end weight, excluding coatings, linings and fittings.
Standard weight equals Schedule 30 in this size. Extra strong equals Schedule 40.
This size, schedule by schedule
A page for each combination, with bore, weight, water capacity and the matching flange and fitting data.
This size in a schedule chart
Common questions
What is the outside diameter of NPS 16 pipe?
NPS 16 pipe has an outside diameter of 16.000 in (406.4 mm). That outside diameter is fixed: it is identical in every schedule, and only the wall thickness — and therefore the bore — changes from one schedule to the next.
How much does NPS 16 schedule 40 pipe weigh?
82.77 lb/ft (123.18 kg/m) as plain-end carbon steel, on a wall thickness of 0.500 in (12.7 mm).
What is the metric equivalent of NPS 16?
DN 400. DN is a dimensionless designator, not a measurement — DN 400 pipe does not measure 400 mm anywhere. Its actual outside diameter is 406.4 mm.