NPS 11 Pipe Dimensions
Outside diameter 11.750 in (298.4 mm) — fixed across every schedule. 4 wall thicknesses from ASME B36.10M, with bore, plain-end weight and flow area for each.
- Nominal size
- NPS 11
- Metric designator
- DN 275
- Outside diameter
- 11.750 in (298.4 mm)
- Schedules listed
- 4
- Standard weight wall
- 0.375 in (9.5 mm)
- Extra strong wall
- 0.500 in (12.7 mm)
Every schedule in NPS 11
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 40 | 0.3759.52 mm | 11.000279.40 mm | 45.5667.80 kg/m | 95.03 | 4.937 |
| STD | 0.3759.52 mm | 11.000279.40 mm | 45.5667.80 kg/m | 95.03 | 4.937 |
| Sch 80 | 0.50012.70 mm | 10.750273.05 mm | 60.0889.40 kg/m | 90.76 | 4.715 |
| XS | 0.50012.70 mm | 10.750273.05 mm | 60.0889.40 kg/m | 90.76 | 4.715 |
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 11 pipe?
NPS 11 pipe has an outside diameter of 11.750 in (298.4 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 11 schedule 40 pipe weigh?
45.56 lb/ft (67.80 kg/m) as plain-end carbon steel, on a wall thickness of 0.375 in (9.5 mm).
What is the metric equivalent of NPS 11?
DN 275. DN is a dimensionless designator, not a measurement — DN 275 pipe does not measure 275 mm anywhere. Its actual outside diameter is 298.4 mm.