NPS 3 1/2 Schedule 5 Pipe
4.000 in (101.6 mm) outside diameter on a 0.083 in (2.1 mm) wall, giving a 3.834 in (97.4 mm) bore and 3.47 lb/ft (5.17 kg/m) empty. ASME B36.10M.
- Nominal size
- NPS 3 1/2 (DN 90)
- Schedule
- Schedule 5
- Outside diameter
- 4.000 in (101.6 mm)
- Wall thickness
- 0.083 in (2.1 mm)
- Inside diameter
- 3.834 in (97.4 mm)
- Weight, empty
- 3.47 lb/ft (5.17 kg/m)
- Weight, water filled
- 8.48 lb/ft (12.62 kg/m)
- Flow area
- 11.545 in² (7448 mm²)
No other designation in NPS 3 1/2 shares this wall thickness, so Schedule 5 is unambiguous in this size.
Every schedule in NPS 3 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 | 3.83497.38 mm | 3.475.17 kg/m | 0.600 |
| Sch 10 | 0.1203.05 mm | 3.76095.50 mm | 4.977.40 kg/m | 0.577 |
| Sch 40 | 0.2265.74 mm | 3.54890.12 mm | 9.1113.56 kg/m | 0.514 |
| STD | 0.2265.74 mm | 3.54890.12 mm | 9.1113.56 kg/m | 0.514 |
| Sch 80 | 0.3188.08 mm | 3.36485.45 mm | 12.5118.61 kg/m | 0.462 |
| XS | 0.3188.08 mm | 3.36485.45 mm | 12.5118.61 kg/m | 0.462 |
| XXS | 0.63616.15 mm | 2.72869.29 mm | 22.8534.00 kg/m | 0.304 |
Weight is plain-end carbon steel, w = 10.6802 × t × (OD − t) lb/ft.
Flanges for NPS 3 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 3.834 in (97.4 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 | 8.50215.90 mm | 0.9423.88 mm | 7.00177.80 mm | 8 × 5/8 in |
| Class 300 | 9.00228.60 mm | 1.1930.23 mm | 7.25184.15 mm | 8 × 3/4 in |
| Class 400 | 9.00228.60 mm | 1.3835.05 mm | 7.25184.15 mm | 8 × 7/8 in |
| Class 600 | 9.00228.60 mm | 1.3835.05 mm | 7.25184.15 mm | 8 × 7/8 in |
Fittings for NPS 3 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 3 1/2 |
|---|---|---|
| 90° Long Radius Elbow | Centre-to-end A | 5.25133.35 mm |
| 90° Short Radius Elbow | Centre-to-end A | 3.5088.90 mm |
| 45° Long Radius Elbow | Centre-to-end B | 2.2557.15 mm |
| Straight Tee | Centre-to-end C and M | 3.7595.25 mm |
| Reducing Tee | Run centre-to-end C | 3.7595.25 mm |
| Concentric Reducer | End-to-end H | 4.00101.60 mm |
| Eccentric Reducer | End-to-end H | 4.00101.60 mm |
| Cap | Length E | 2.5063.50 mm |
Common questions
What is the inside diameter of NPS 3 1/2 schedule 5 pipe?
3.834 in (97.4 mm). The outside diameter is fixed at 4.000 in (101.6 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 1/2 schedule 5 pipe weigh?
3.47 lb/ft (5.17 kg/m) empty, as plain-end carbon steel. Full of water it comes to 8.48 lb/ft (12.62 kg/m), because the bore holds 0.600 US gallons per foot. One short ton of this pipe is about 576 ft.
Does NPS 3 1/2 schedule 5 pipe use special flanges or fittings?
No. Flanges and buttweld fittings are dimensioned from NPS, so NPS 3 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 3.834 in (97.4 mm) to match.