NPS 6 Pipe Dimensions
Outside diameter 6.625 in (168.3 mm) — fixed across every schedule. 9 wall thicknesses from ASME B36.10M, with bore, plain-end weight and flow area for each.
- Nominal size
- NPS 6
- Metric designator
- DN 150
- Outside diameter
- 6.625 in (168.3 mm)
- Schedules listed
- 9
- Standard weight wall
- 0.280 in (7.1 mm)
- Extra strong wall
- 0.432 in (11.0 mm)
Every schedule in NPS 6
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 | 0.1092.77 mm | 6.407162.74 mm | 7.5911.29 kg/m | 32.24 | 1.675 |
| Sch 10 | 0.1343.40 mm | 6.357161.47 mm | 9.2913.82 kg/m | 31.74 | 1.649 |
| Sch 40 | 0.2807.11 mm | 6.065154.05 mm | 18.9728.24 kg/m | 28.89 | 1.501 |
| STD | 0.2807.11 mm | 6.065154.05 mm | 18.9728.24 kg/m | 28.89 | 1.501 |
| Sch 80 | 0.43210.97 mm | 5.761146.33 mm | 28.5742.52 kg/m | 26.07 | 1.354 |
| XS | 0.43210.97 mm | 5.761146.33 mm | 28.5742.52 kg/m | 26.07 | 1.354 |
| Sch 120 | 0.56214.27 mm | 5.501139.73 mm | 36.3954.16 kg/m | 23.77 | 1.235 |
| Sch 160 | 0.71918.26 mm | 5.187131.75 mm | 45.3567.49 kg/m | 21.13 | 1.098 |
| XXS | 0.86421.95 mm | 4.897124.38 mm | 53.1679.11 kg/m | 18.83 | 0.978 |
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 40 in this size. Extra strong equals Schedule 80.
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 6 pipe?
NPS 6 pipe has an outside diameter of 6.625 in (168.3 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 6 schedule 40 pipe weigh?
18.97 lb/ft (28.24 kg/m) as plain-end carbon steel, on a wall thickness of 0.280 in (7.1 mm).
What is the metric equivalent of NPS 6?
DN 150. DN is a dimensionless designator, not a measurement — DN 150 pipe does not measure 150 mm anywhere. Its actual outside diameter is 168.3 mm.