NPS 26 Pipe Dimensions
Outside diameter 26.000 in (660.4 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 26
- Metric designator
- DN 650
- Outside diameter
- 26.000 in (660.4 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 26
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 | 25.376644.55 mm | 85.60127.38 kg/m | 505.75 | 26.273 |
| Sch 20 | 0.50012.70 mm | 25.000635.00 mm | 136.17202.65 kg/m | 490.87 | 25.500 |
| STD | 0.3759.52 mm | 25.250641.35 mm | 102.63152.73 kg/m | 500.74 | 26.012 |
| XS | 0.50012.70 mm | 25.000635.00 mm | 136.17202.65 kg/m | 490.87 | 25.500 |
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 26 pipe?
NPS 26 pipe has an outside diameter of 26.000 in (660.4 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 26 schedule 40 pipe weigh?
102.63 lb/ft (152.73 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 26?
DN 650. DN is a dimensionless designator, not a measurement — DN 650 pipe does not measure 650 mm anywhere. Its actual outside diameter is 660.4 mm.