NPS 2 1/2 Pipe Dimensions
Outside diameter 2.875 in (73.0 mm) — fixed across every schedule. 8 wall thicknesses from ASME B36.10M, with bore, plain-end weight and flow area for each.
- Nominal size
- NPS 2 1/2
- Metric designator
- DN 65
- Outside diameter
- 2.875 in (73.0 mm)
- Schedules listed
- 8
- Standard weight wall
- 0.203 in (5.2 mm)
- Extra strong wall
- 0.276 in (7.0 mm)
Every schedule in NPS 2 1/2
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 | 0.0832.11 mm | 2.70968.81 mm | 2.473.68 kg/m | 5.76 | 0.299 |
| Sch 10 | 0.1203.05 mm | 2.63566.93 mm | 3.535.25 kg/m | 5.45 | 0.283 |
| Sch 40 | 0.2035.16 mm | 2.46962.71 mm | 5.798.62 kg/m | 4.79 | 0.249 |
| STD | 0.2035.16 mm | 2.46962.71 mm | 5.798.62 kg/m | 4.79 | 0.249 |
| Sch 80 | 0.2767.01 mm | 2.32359.00 mm | 7.6611.40 kg/m | 4.24 | 0.220 |
| XS | 0.2767.01 mm | 2.32359.00 mm | 7.6611.40 kg/m | 4.24 | 0.220 |
| Sch 160 | 0.3759.52 mm | 2.12553.97 mm | 10.0114.90 kg/m | 3.55 | 0.184 |
| XXS | 0.55214.02 mm | 1.77144.98 mm | 13.7020.38 kg/m | 2.46 | 0.128 |
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 2 1/2 pipe?
NPS 2 1/2 pipe has an outside diameter of 2.875 in (73.0 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 2 1/2 schedule 40 pipe weigh?
5.79 lb/ft (8.62 kg/m) as plain-end carbon steel, on a wall thickness of 0.203 in (5.2 mm).
What is the metric equivalent of NPS 2 1/2?
DN 65. DN is a dimensionless designator, not a measurement — DN 65 pipe does not measure 65 mm anywhere. Its actual outside diameter is 73.0 mm.