NPS 3 Schedule 5 Pipe
3.500 in (88.9 mm) outside diameter on a 0.083 in (2.1 mm) wall, giving a 3.334 in (84.7 mm) bore and 3.03 lb/ft (4.51 kg/m) empty. ASME B36.10M.
- Nominal size
- NPS 3 (DN 80)
- Schedule
- Schedule 5
- Outside diameter
- 3.500 in (88.9 mm)
- Wall thickness
- 0.083 in (2.1 mm)
- Inside diameter
- 3.334 in (84.7 mm)
- Weight, empty
- 3.03 lb/ft (4.51 kg/m)
- Weight, water filled
- 6.81 lb/ft (10.14 kg/m)
- Flow area
- 8.730 in² (5632 mm²)
No other designation in NPS 3 shares this wall thickness, so Schedule 5 is unambiguous in this size.
Every schedule in NPS 3
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 | 3.33484.68 mm | 3.034.51 kg/m | 0.454 |
| Sch 10 | 0.1203.05 mm | 3.26082.80 mm | 4.336.45 kg/m | 0.434 |
| Sch 40 | 0.2165.49 mm | 3.06877.93 mm | 7.5811.27 kg/m | 0.384 |
| STD | 0.2165.49 mm | 3.06877.93 mm | 7.5811.27 kg/m | 0.384 |
| Sch 80 | 0.3007.62 mm | 2.90073.66 mm | 10.2515.26 kg/m | 0.343 |
| XS | 0.3007.62 mm | 2.90073.66 mm | 10.2515.26 kg/m | 0.343 |
| Sch 160 | 0.43811.13 mm | 2.62466.65 mm | 14.3221.32 kg/m | 0.281 |
| XXS | 0.60015.24 mm | 2.30058.42 mm | 18.5827.66 kg/m | 0.216 |
Weight is plain-end carbon steel, w = 10.6802 × t × (OD − t) lb/ft.
Flanges for NPS 3 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 3.334 in (84.7 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 | 7.50190.50 mm | 0.9423.88 mm | 6.00152.40 mm | 4 × 5/8 in |
| Class 300 | 8.25209.55 mm | 1.1228.45 mm | 6.62168.15 mm | 8 × 3/4 in |
| Class 400 | 8.25209.55 mm | 1.2531.75 mm | 6.62168.15 mm | 8 × 3/4 in |
| Class 600 | 8.25209.55 mm | 1.2531.75 mm | 6.62168.15 mm | 8 × 3/4 in |
| Class 900 | 9.50241.30 mm | 1.5038.10 mm | 7.50190.50 mm | 8 × 7/8 in |
| Class 1500 | 10.50266.70 mm | 1.8847.75 mm | 8.00203.20 mm | 8 × 1 1/8 in |
| Class 2500 | 12.00304.80 mm | 2.6266.55 mm | 9.00228.60 mm | 8 × 1 1/4 in |
Fittings for NPS 3 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 3 |
|---|---|---|
| 90° Long Radius Elbow | Centre-to-end A | 4.50114.30 mm |
| 90° Short Radius Elbow | Centre-to-end A | 3.0076.20 mm |
| 45° Long Radius Elbow | Centre-to-end B | 2.0050.80 mm |
| Straight Tee | Centre-to-end C and M | 3.3885.85 mm |
| Reducing Tee | Run centre-to-end C | 3.3885.85 mm |
| Concentric Reducer | End-to-end H | 3.5088.90 mm |
| Eccentric Reducer | End-to-end H | 3.5088.90 mm |
| Cap | Length E | 2.0050.80 mm |
Common questions
What is the inside diameter of NPS 3 schedule 5 pipe?
3.334 in (84.7 mm). The outside diameter is fixed at 3.500 in (88.9 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 3 schedule 5 pipe weigh?
3.03 lb/ft (4.51 kg/m) empty, as plain-end carbon steel. Full of water it comes to 6.81 lb/ft (10.14 kg/m), because the bore holds 0.454 US gallons per foot. One short ton of this pipe is about 660 ft.
Does NPS 3 schedule 5 pipe use special flanges or fittings?
No. Flanges and buttweld fittings are dimensioned from NPS, so NPS 3 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 3.334 in (84.7 mm) to match.