NPS 28 Schedule 20 Pipe
28.000 in (711.2 mm) outside diameter on a 0.500 in (12.7 mm) wall, giving a 27.000 in (685.8 mm) bore and 146.85 lb/ft (218.54 kg/m) empty. ASME B36.10M.
- Nominal size
- NPS 28 (DN 700)
- Schedule
- Schedule 20
- Outside diameter
- 28.000 in (711.2 mm)
- Wall thickness
- 0.500 in (12.7 mm)
- Inside diameter
- 27.000 in (685.8 mm)
- Weight, empty
- 146.85 lb/ft (218.54 kg/m)
- Weight, water filled
- 395.07 lb/ft (587.93 kg/m)
- Flow area
- 572.555 in² (369390 mm²)
In NPS 28 this wall thickness is also designated Extra Strong (XS). That is the same pipe under another name, not a different product — but the coincidence is specific to this size and does not hold across the range.
Every schedule in NPS 28
Dimensions are given in inches, with the millimetre equivalent beneath in grey.
| Schedule | Wall thickness | Inside diameter | Weight, empty | Water (US gal/ft) |
|---|---|---|---|---|
| Sch 10 | 0.3127.92 mm | 27.376695.35 mm | 92.26137.30 kg/m | 30.577 |
| Sch 20 this page | 0.50012.70 mm | 27.000685.80 mm | 146.85218.54 kg/m | 29.743 |
| Sch 30 | 0.62515.88 mm | 26.750679.45 mm | 182.73271.93 kg/m | 29.195 |
| STD | 0.3759.52 mm | 27.250692.15 mm | 110.64164.65 kg/m | 30.296 |
| XS | 0.50012.70 mm | 27.000685.80 mm | 146.85218.54 kg/m | 29.743 |
Weight is plain-end carbon steel, w = 10.6802 × t × (OD − t) lb/ft.
Common questions
What is the inside diameter of NPS 28 schedule 20 pipe?
27.000 in (685.8 mm). The outside diameter is fixed at 28.000 in (711.2 mm) by ASME B36.10M, and the 0.500 in (12.7 mm) wall takes 1.000 in off it — 0.500 in from each side — leaving that bore.
How much does NPS 28 schedule 20 pipe weigh?
146.85 lb/ft (218.54 kg/m) empty, as plain-end carbon steel. Full of water it comes to 395.07 lb/ft (587.93 kg/m), because the bore holds 29.743 US gallons per foot. One short ton of this pipe is about 14 ft.
Does NPS 28 schedule 20 pipe use special flanges or fittings?
No. Flanges and buttweld fittings are dimensioned from NPS, so NPS 28 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 27.000 in (685.8 mm) to match.