NPS 1/2 Schedule 5 Pipe
0.840 in (21.3 mm) outside diameter on a 0.065 in (1.7 mm) wall, giving a 0.710 in (18.0 mm) bore and 0.54 lb/ft (0.80 kg/m) empty. ASME B36.10M.
- Nominal size
- NPS 1/2 (DN 15)
- Schedule
- Schedule 5
- Outside diameter
- 0.840 in (21.3 mm)
- Wall thickness
- 0.065 in (1.7 mm)
- Inside diameter
- 0.710 in (18.0 mm)
- Weight, empty
- 0.54 lb/ft (0.80 kg/m)
- Weight, water filled
- 0.71 lb/ft (1.06 kg/m)
- Flow area
- 0.396 in² (255 mm²)
No other designation in NPS 1/2 shares this wall thickness, so Schedule 5 is unambiguous in this size.
Every schedule in NPS 1/2
Dimensions are given in inches, with the millimetre equivalent beneath in grey.
| Schedule | Wall thickness | Inside diameter | Weight, empty | Water (US gal/ft) |
|---|---|---|---|---|
| Sch 5 this page | 0.0651.65 mm | 0.71018.03 mm | 0.540.80 kg/m | 0.021 |
| Sch 10 | 0.0832.11 mm | 0.67417.12 mm | 0.671.00 kg/m | 0.019 |
| Sch 40 | 0.1092.77 mm | 0.62215.80 mm | 0.851.27 kg/m | 0.016 |
| STD | 0.1092.77 mm | 0.62215.80 mm | 0.851.27 kg/m | 0.016 |
| Sch 80 | 0.1473.73 mm | 0.54613.87 mm | 1.091.62 kg/m | 0.012 |
| XS | 0.1473.73 mm | 0.54613.87 mm | 1.091.62 kg/m | 0.012 |
| Sch 160 | 0.1884.78 mm | 0.46411.79 mm | 1.311.95 kg/m | 0.009 |
| XXS | 0.2947.47 mm | 0.2526.40 mm | 1.712.55 kg/m | 0.003 |
Weight is plain-end carbon steel, w = 10.6802 × t × (OD − t) lb/ft.
Flanges for NPS 1/2 pipe
Flange dimensions are set by NPS and pressure class, not by schedule, so every flange below fits this pipe. The exception is the weld neck: its bore is machined to the pipe it is welded to, which for Schedule 5 means 0.710 in (18.0 mm). Order the flange to the schedule or the bores will not line up at the weld.
| Class | Flange OD | Thickness | Bolt circle | Bolting |
|---|---|---|---|---|
| Class 150 | 3.5088.90 mm | 0.4411.18 mm | 2.3860.45 mm | 4 × 1/2 in |
| Class 300 | 3.7595.25 mm | 0.5614.22 mm | 2.6266.55 mm | 4 × 1/2 in |
| Class 400 | 3.7595.25 mm | 0.5614.22 mm | 2.6266.55 mm | 4 × 1/2 in |
| Class 600 | 3.7595.25 mm | 0.5614.22 mm | 2.6266.55 mm | 4 × 1/2 in |
| Class 900 | 4.75120.65 mm | 0.8822.35 mm | 3.2582.55 mm | 4 × 3/4 in |
| Class 1500 | 4.75120.65 mm | 0.8822.35 mm | 3.2582.55 mm | 4 × 3/4 in |
| Class 2500 | 5.25133.35 mm | 1.1930.23 mm | 3.5088.90 mm | 4 × 3/4 in |
Fittings for NPS 1/2 pipe
ASME B16.9 dimensions come from NPS alone, so these figures hold for Schedule 5 exactly as they do for every other schedule in the size. Only the wall thickness has to be ordered to match.
| Fitting | Dimension | NPS 1/2 |
|---|---|---|
| 90° Long Radius Elbow | Centre-to-end A | 1.5038.10 mm |
| 45° Long Radius Elbow | Centre-to-end B | 0.6215.75 mm |
| Straight Tee | Centre-to-end C and M | 1.0025.40 mm |
| Concentric Reducer | End-to-end H | 1.5038.10 mm |
| Eccentric Reducer | End-to-end H | 1.5038.10 mm |
| Cap | Length E | 1.0025.40 mm |
Common questions
What is the inside diameter of NPS 1/2 schedule 5 pipe?
0.710 in (18.0 mm). The outside diameter is fixed at 0.840 in (21.3 mm) by ASME B36.10M, and the 0.065 in (1.7 mm) wall takes 0.130 in off it — 0.065 in from each side — leaving that bore.
How much does NPS 1/2 schedule 5 pipe weigh?
0.54 lb/ft (0.80 kg/m) empty, as plain-end carbon steel. Full of water it comes to 0.71 lb/ft (1.06 kg/m), because the bore holds 0.021 US gallons per foot. One short ton of this pipe is about 3717 ft.
Does NPS 1/2 schedule 5 pipe use special flanges or fittings?
No. Flanges and buttweld fittings are dimensioned from NPS, so NPS 1/2 hardware fits this pipe in any schedule. The one thing that does follow the schedule is the bore of a weld neck flange or a fitting end prep, which has to be 0.710 in (18.0 mm) to match.