NPS 7 Double Extra Strong (XXS) Pipe
7.625 in (193.7 mm) outside diameter on a 0.875 in (22.2 mm) wall, giving a 5.875 in (149.2 mm) bore and 63.08 lb/ft (93.87 kg/m) empty. ASME B36.10M.
- Nominal size
- NPS 7 (DN 175)
- Schedule
- Double Extra Strong (XXS)
- Outside diameter
- 7.625 in (193.7 mm)
- Wall thickness
- 0.875 in (22.2 mm)
- Inside diameter
- 5.875 in (149.2 mm)
- Weight, empty
- 63.08 lb/ft (93.87 kg/m)
- Weight, water filled
- 74.83 lb/ft (111.36 kg/m)
- Flow area
- 27.109 in² (17489 mm²)
No other designation in NPS 7 shares this wall thickness, so Double Extra Strong (XXS) is unambiguous in this size.
Every schedule in NPS 7
Dimensions are given in inches, with the millimetre equivalent beneath in grey.
| Schedule | Wall thickness | Inside diameter | Weight, empty | Water (US gal/ft) |
|---|---|---|---|---|
| Sch 40 | 0.3017.65 mm | 7.023178.38 mm | 23.5435.04 kg/m | 2.012 |
| STD | 0.3017.65 mm | 7.023178.38 mm | 23.5435.04 kg/m | 2.012 |
| Sch 80 | 0.50012.70 mm | 6.625168.27 mm | 38.0556.62 kg/m | 1.791 |
| XS | 0.50012.70 mm | 6.625168.27 mm | 38.0556.62 kg/m | 1.791 |
| XXS this page | 0.87522.22 mm | 5.875149.22 mm | 63.0893.87 kg/m | 1.408 |
Weight is plain-end carbon steel, w = 10.6802 × t × (OD − t) lb/ft.
Common questions
What is the inside diameter of NPS 7 double extra strong (xxs) pipe?
5.875 in (149.2 mm). The outside diameter is fixed at 7.625 in (193.7 mm) by ASME B36.10M, and the 0.875 in (22.2 mm) wall takes 1.750 in off it — 0.875 in from each side — leaving that bore.
How much does NPS 7 double extra strong (xxs) pipe weigh?
63.08 lb/ft (93.87 kg/m) empty, as plain-end carbon steel. Full of water it comes to 74.83 lb/ft (111.36 kg/m), because the bore holds 1.408 US gallons per foot. One short ton of this pipe is about 32 ft.
Does NPS 7 double extra strong (xxs) pipe use special flanges or fittings?
No. Flanges and buttweld fittings are dimensioned from NPS, so NPS 7 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 5.875 in (149.2 mm) to match.