NPS 2 1/2 Schedule 5 Pipe
2.875 in (73.0 mm) outside diameter on a 0.083 in (2.1 mm) wall, giving a 2.709 in (68.8 mm) bore and 2.47 lb/ft (3.68 kg/m) empty. ASME B36.10M.
- Nominal size
- NPS 2 1/2 (DN 65)
- Schedule
- Schedule 5
- Outside diameter
- 2.875 in (73.0 mm)
- Wall thickness
- 0.083 in (2.1 mm)
- Inside diameter
- 2.709 in (68.8 mm)
- Weight, empty
- 2.47 lb/ft (3.68 kg/m)
- Weight, water filled
- 4.97 lb/ft (7.40 kg/m)
- Flow area
- 5.764 in² (3719 mm²)
No other designation in NPS 2 1/2 shares this wall thickness, so Schedule 5 is unambiguous in this size.
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 | Water (US gal/ft) |
|---|---|---|---|---|
| Sch 5 this page | 0.0832.11 mm | 2.70968.81 mm | 2.473.68 kg/m | 0.299 |
| Sch 10 | 0.1203.05 mm | 2.63566.93 mm | 3.535.25 kg/m | 0.283 |
| Sch 40 | 0.2035.16 mm | 2.46962.71 mm | 5.798.62 kg/m | 0.249 |
| STD | 0.2035.16 mm | 2.46962.71 mm | 5.798.62 kg/m | 0.249 |
| Sch 80 | 0.2767.01 mm | 2.32359.00 mm | 7.6611.40 kg/m | 0.220 |
| XS | 0.2767.01 mm | 2.32359.00 mm | 7.6611.40 kg/m | 0.220 |
| Sch 160 | 0.3759.52 mm | 2.12553.97 mm | 10.0114.90 kg/m | 0.184 |
| XXS | 0.55214.02 mm | 1.77144.98 mm | 13.7020.38 kg/m | 0.128 |
Weight is plain-end carbon steel, w = 10.6802 × t × (OD − t) lb/ft.
Flanges for NPS 2 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 2.709 in (68.8 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 | 7.00177.80 mm | 0.8822.35 mm | 5.50139.70 mm | 4 × 5/8 in |
| Class 300 | 7.50190.50 mm | 1.0025.40 mm | 5.88149.35 mm | 8 × 3/4 in |
| Class 400 | 7.50190.50 mm | 1.1228.45 mm | 5.88149.35 mm | 8 × 3/4 in |
| Class 600 | 7.50190.50 mm | 1.1228.45 mm | 5.88149.35 mm | 8 × 3/4 in |
| Class 900 | 9.62244.35 mm | 1.6241.15 mm | 7.50190.50 mm | 8 × 1 in |
| Class 1500 | 9.62244.35 mm | 1.6241.15 mm | 7.50190.50 mm | 8 × 1 in |
| Class 2500 | 10.50266.70 mm | 2.2557.15 mm | 7.75196.85 mm | 8 × 1 1/8 in |
Fittings for NPS 2 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 2 1/2 |
|---|---|---|
| 90° Long Radius Elbow | Centre-to-end A | 3.7595.25 mm |
| 90° Short Radius Elbow | Centre-to-end A | 2.5063.50 mm |
| 45° Long Radius Elbow | Centre-to-end B | 1.7544.45 mm |
| Straight Tee | Centre-to-end C and M | 3.0076.20 mm |
| Reducing Tee | Run centre-to-end C | 3.0076.20 mm |
| Concentric Reducer | End-to-end H | 3.5088.90 mm |
| Eccentric Reducer | End-to-end H | 3.5088.90 mm |
| Cap | Length E | 1.5038.10 mm |
Common questions
What is the inside diameter of NPS 2 1/2 schedule 5 pipe?
2.709 in (68.8 mm). The outside diameter is fixed at 2.875 in (73.0 mm) by ASME B36.10M, and the 0.083 in (2.1 mm) wall takes 0.166 in off it — 0.083 in from each side — leaving that bore.
How much does NPS 2 1/2 schedule 5 pipe weigh?
2.47 lb/ft (3.68 kg/m) empty, as plain-end carbon steel. Full of water it comes to 4.97 lb/ft (7.40 kg/m), because the bore holds 0.299 US gallons per foot. One short ton of this pipe is about 808 ft.
Does NPS 2 1/2 schedule 5 pipe use special flanges or fittings?
No. Flanges and buttweld fittings are dimensioned from NPS, so NPS 2 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 2.709 in (68.8 mm) to match.