NPS 1 1/2 Pipe Dimensions
Outside diameter 1.900 in (48.3 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 1 1/2
- Metric designator
- DN 40
- Outside diameter
- 1.900 in (48.3 mm)
- Schedules listed
- 8
- Standard weight wall
- 0.145 in (3.7 mm)
- Extra strong wall
- 0.200 in (5.1 mm)
Every schedule in NPS 1 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 | 0.0651.65 mm | 1.77044.96 mm | 1.271.90 kg/m | 2.46 | 0.128 |
| Sch 10 | 0.1092.77 mm | 1.68242.72 mm | 2.083.10 kg/m | 2.22 | 0.115 |
| Sch 40 | 0.1453.68 mm | 1.61040.89 mm | 2.724.04 kg/m | 2.04 | 0.106 |
| STD | 0.1453.68 mm | 1.61040.89 mm | 2.724.04 kg/m | 2.04 | 0.106 |
| Sch 80 | 0.2005.08 mm | 1.50038.10 mm | 3.635.40 kg/m | 1.77 | 0.092 |
| XS | 0.2005.08 mm | 1.50038.10 mm | 3.635.40 kg/m | 1.77 | 0.092 |
| Sch 160 | 0.2817.14 mm | 1.33833.99 mm | 4.867.23 kg/m | 1.41 | 0.073 |
| XXS | 0.40010.16 mm | 1.10027.94 mm | 6.419.54 kg/m | 0.95 | 0.049 |
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 1 1/2 pipe?
NPS 1 1/2 pipe has an outside diameter of 1.900 in (48.3 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 1 1/2 schedule 40 pipe weigh?
2.72 lb/ft (4.04 kg/m) as plain-end carbon steel, on a wall thickness of 0.145 in (3.7 mm).
What is the metric equivalent of NPS 1 1/2?
DN 40. DN is a dimensionless designator, not a measurement — DN 40 pipe does not measure 40 mm anywhere. Its actual outside diameter is 48.3 mm.