NPS 28 Pipe Dimensions
Outside diameter 28.000 in (711.2 mm) — fixed across every schedule. 5 wall thicknesses from ASME B36.10M, with bore, plain-end weight and flow area for each.
- Nominal size
- NPS 28
- Metric designator
- DN 700
- Outside diameter
- 28.000 in (711.2 mm)
- Schedules listed
- 5
- Standard weight wall
- 0.375 in (9.5 mm)
- Extra strong wall
- 0.500 in (12.7 mm)
Every schedule in NPS 28
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 10 | 0.3127.92 mm | 27.376695.35 mm | 92.26137.30 kg/m | 588.61 | 30.577 |
| Sch 20 | 0.50012.70 mm | 27.000685.80 mm | 146.85218.54 kg/m | 572.56 | 29.743 |
| Sch 30 | 0.62515.88 mm | 26.750679.45 mm | 182.73271.93 kg/m | 562.00 | 29.195 |
| STD | 0.3759.52 mm | 27.250692.15 mm | 110.64164.65 kg/m | 583.21 | 30.296 |
| XS | 0.50012.70 mm | 27.000685.80 mm | 146.85218.54 kg/m | 572.56 | 29.743 |
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 does not coincide with any numbered schedule in this size. Extra strong equals Schedule 20.
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 28 pipe?
NPS 28 pipe has an outside diameter of 28.000 in (711.2 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 28 schedule 40 pipe weigh?
110.64 lb/ft (164.65 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 28?
DN 700. DN is a dimensionless designator, not a measurement — DN 700 pipe does not measure 700 mm anywhere. Its actual outside diameter is 711.2 mm.