NPS 3 Pipe Dimensions
Outside diameter 3.500 in (88.9 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 3
- Metric designator
- DN 80
- Outside diameter
- 3.500 in (88.9 mm)
- Schedules listed
- 8
- Standard weight wall
- 0.216 in (5.5 mm)
- Extra strong wall
- 0.300 in (7.6 mm)
Every schedule in NPS 3
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 | 3.33484.68 mm | 3.034.51 kg/m | 8.73 | 0.454 |
| Sch 10 | 0.1203.05 mm | 3.26082.80 mm | 4.336.45 kg/m | 8.35 | 0.434 |
| Sch 40 | 0.2165.49 mm | 3.06877.93 mm | 7.5811.27 kg/m | 7.39 | 0.384 |
| STD | 0.2165.49 mm | 3.06877.93 mm | 7.5811.27 kg/m | 7.39 | 0.384 |
| Sch 80 | 0.3007.62 mm | 2.90073.66 mm | 10.2515.26 kg/m | 6.61 | 0.343 |
| XS | 0.3007.62 mm | 2.90073.66 mm | 10.2515.26 kg/m | 6.61 | 0.343 |
| Sch 160 | 0.43811.13 mm | 2.62466.65 mm | 14.3221.32 kg/m | 5.41 | 0.281 |
| XXS | 0.60015.24 mm | 2.30058.42 mm | 18.5827.66 kg/m | 4.15 | 0.216 |
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 3 pipe?
NPS 3 pipe has an outside diameter of 3.500 in (88.9 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 3 schedule 40 pipe weigh?
7.58 lb/ft (11.27 kg/m) as plain-end carbon steel, on a wall thickness of 0.216 in (5.5 mm).
What is the metric equivalent of NPS 3?
DN 80. DN is a dimensionless designator, not a measurement — DN 80 pipe does not measure 80 mm anywhere. Its actual outside diameter is 88.9 mm.