NPS 5 Schedule 5 Pipe
5.563 in (141.3 mm) outside diameter on a 0.109 in (2.8 mm) wall, giving a 5.345 in (135.8 mm) bore and 6.35 lb/ft (9.45 kg/m) empty. ASME B36.10M.
- Nominal size
- NPS 5 (DN 125)
- Schedule
- Schedule 5
- Outside diameter
- 5.563 in (141.3 mm)
- Wall thickness
- 0.109 in (2.8 mm)
- Inside diameter
- 5.345 in (135.8 mm)
- Weight, empty
- 6.35 lb/ft (9.45 kg/m)
- Weight, water filled
- 16.08 lb/ft (23.92 kg/m)
- Flow area
- 22.438 in² (14476 mm²)
No other designation in NPS 5 shares this wall thickness, so Schedule 5 is unambiguous in this size.
Every schedule in NPS 5
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 | 0.1092.77 mm | 5.345135.76 mm | 6.359.45 kg/m | 1.166 |
| Sch 10 | 0.1343.40 mm | 5.295134.49 mm | 7.7711.56 kg/m | 1.144 |
| Sch 40 | 0.2586.55 mm | 5.047128.19 mm | 14.6221.75 kg/m | 1.039 |
| STD | 0.2586.55 mm | 5.047128.19 mm | 14.6221.75 kg/m | 1.039 |
| Sch 80 | 0.3759.52 mm | 4.813122.25 mm | 20.7830.92 kg/m | 0.945 |
| XS | 0.3759.52 mm | 4.813122.25 mm | 20.7830.92 kg/m | 0.945 |
| Sch 120 | 0.50012.70 mm | 4.563115.90 mm | 27.0440.24 kg/m | 0.849 |
| Sch 160 | 0.62515.88 mm | 4.313109.55 mm | 32.9649.05 kg/m | 0.759 |
| XXS | 0.75019.05 mm | 4.063103.20 mm | 38.5557.37 kg/m | 0.674 |
Weight is plain-end carbon steel, w = 10.6802 × t × (OD − t) lb/ft.
Flanges for NPS 5 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 5.345 in (135.8 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 | 10.00254.00 mm | 0.9423.88 mm | 8.50215.90 mm | 8 × 3/4 in |
| Class 300 | 11.00279.40 mm | 1.3835.05 mm | 9.25234.95 mm | 8 × 3/4 in |
| Class 400 | 11.00279.40 mm | 1.5038.10 mm | 9.25234.95 mm | 8 × 7/8 in |
| Class 600 | 13.00330.20 mm | 1.7544.45 mm | 10.50266.70 mm | 8 × 1 in |
| Class 900 | 13.75349.25 mm | 2.0050.80 mm | 11.00279.40 mm | 8 × 1 1/4 in |
| Class 1500 | 14.75374.65 mm | 2.8873.15 mm | 11.50292.10 mm | 8 × 1 1/2 in |
| Class 2500 | 16.50419.10 mm | 3.6291.95 mm | 12.75323.85 mm | 8 × 1 3/4 in |
Fittings for NPS 5 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 5 |
|---|---|---|
| 90° Long Radius Elbow | Centre-to-end A | 7.50190.50 mm |
| 90° Short Radius Elbow | Centre-to-end A | 5.00127.00 mm |
| 45° Long Radius Elbow | Centre-to-end B | 3.1279.25 mm |
| Straight Tee | Centre-to-end C and M | 4.88123.95 mm |
| Reducing Tee | Run centre-to-end C | 4.88123.95 mm |
| Concentric Reducer | End-to-end H | 5.00127.00 mm |
| Eccentric Reducer | End-to-end H | 5.00127.00 mm |
| Cap | Length E | 3.0076.20 mm |
Common questions
What is the inside diameter of NPS 5 schedule 5 pipe?
5.345 in (135.8 mm). The outside diameter is fixed at 5.563 in (141.3 mm) by ASME B36.10M, and the 0.109 in (2.8 mm) wall takes 0.218 in off it — 0.109 in from each side — leaving that bore.
How much does NPS 5 schedule 5 pipe weigh?
6.35 lb/ft (9.45 kg/m) empty, as plain-end carbon steel. Full of water it comes to 16.08 lb/ft (23.92 kg/m), because the bore holds 1.166 US gallons per foot. One short ton of this pipe is about 315 ft.
Does NPS 5 schedule 5 pipe use special flanges or fittings?
No. Flanges and buttweld fittings are dimensioned from NPS, so NPS 5 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 5.345 in (135.8 mm) to match.