XXS (double extra strong) pipe dimensions: OD, wall thickness, ID and weight
Deskely Completions team Singapore
XXS, double extra strong, is the heaviest of the three weight classes (STD, XS, XXS). It is listed in ASME B36.10M from NPS 1/2 to NPS 12.
The chart below gives every size in XXS, from NPS 1/2 to 12: outside diameter, wall thickness, inside diameter and the weight of plain-end carbon steel pipe, in mm and inches.
- XXS is a wall thickness that changes with size: 11.07 mm on NPS 2, 17.12 mm on NPS 4.
- The outside diameter is fixed for each NPS, so a heavier schedule only changes the bore.
- Typical use: very high pressure small-bore lines and connections where the thickest available wall is needed..
- Weights are for plain-end carbon steel; stainless steel is about 2 percent heavier.
XXS (double extra strong) pipe chart
Click a size for every schedule of that size. Dimensions are nominal, per ASME B36.19M.
| NPS | DN | OD mm (in) | Wall mm (in) | ID mm (in) | kg/m (lb/ft) |
|---|---|---|---|---|---|
| 1/2 | 15 | 21.3 (0.840) | 7.47 (0.294) | 6.36 (0.250) | 2.55 (1.71) |
| 3/4 | 20 | 26.7 (1.050) | 7.82 (0.308) | 11.06 (0.435) | 3.64 (2.45) |
| 1 | 25 | 33.4 (1.315) | 9.09 (0.358) | 15.22 (0.599) | 5.45 (3.66) |
| 1-1/4 | 32 | 42.2 (1.660) | 9.70 (0.382) | 22.80 (0.898) | 7.77 (5.22) |
| 1-1/2 | 40 | 48.3 (1.900) | 10.15 (0.400) | 28.00 (1.102) | 9.55 (6.42) |
| 2 | 50 | 60.3 (2.375) | 11.07 (0.436) | 38.16 (1.502) | 13.44 (9.03) |
| 2-1/2 | 65 | 73 (2.875) | 14.02 (0.552) | 44.96 (1.770) | 20.39 (13.70) |
| 3 | 80 | 88.9 (3.500) | 15.24 (0.600) | 58.42 (2.300) | 27.68 (18.60) |
| 4 | 100 | 114.3 (4.500) | 17.12 (0.674) | 80.06 (3.152) | 41.03 (27.57) |
| 5 | 125 | 141.3 (5.563) | 19.05 (0.750) | 103.20 (4.063) | 57.43 (38.59) |
| 6 | 150 | 168.3 (6.625) | 21.95 (0.864) | 124.40 (4.898) | 79.22 (53.23) |
| 8 | 200 | 219.1 (8.625) | 22.23 (0.875) | 174.64 (6.876) | 107.93 (72.52) |
| 10 | 250 | 273.1 (10.750) | 25.40 (1.000) | 222.30 (8.752) | 155.16 (104.26) |
| 12 | 300 | 323.8 (12.750) | 25.40 (1.000) | 273.00 (10.748) | 186.92 (125.60) |
Mill tolerances apply, and the pipe specification and purchase order for your project take precedence over this chart.
How to work out the inside diameter and weight
The inside diameter is the outside diameter minus twice the wall thickness. The weight per metre of plain-end carbon steel pipe is:
W (kg/m) = 0.0246615 x (OD - t) x t, with OD and wall thickness t in mm. For NPS 4 XXS: 0.0246615 x (114.3 - 17.12) x 17.12 = 41.03 kg/m.
Where XXS pipe is used
Very high pressure small-bore lines and connections where the thickest available wall is needed.
Schedule 160 is thinner than XXS up to NPS 6, and thicker from NPS 8 up.
Every schedule in one chart
To compare schedules side by side, or look up a size in any schedule, use the full pipe schedule chart. Other schedules:
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Frequently asked questions
What is the wall thickness of XXS pipe?
It depends on the size. NPS 1/2: 7.47 mm, NPS 1: 9.09 mm, NPS 2: 11.07 mm, NPS 4: 17.12 mm, NPS 6: 21.95 mm, NPS 8: 22.23 mm, NPS 12: 25.40 mm. See the chart for every size.
What is the inside diameter of 2 inch XXS pipe?
38.2 mm (1.502 in), from an outside diameter of 60.3 mm and a wall of 11.07 mm.
How much does 4 inch XXS pipe weigh?
41.03 kg/m (27.57 lb/ft) for plain-end carbon steel.
How does XXS compare with other schedules?
Schedule 160 is thinner than XXS up to NPS 6, and thicker from NPS 8 up.
Is the outside diameter the same for every schedule?
Yes. For each NPS the outside diameter is fixed so that fittings and flanges fit; only the wall thickness and so the bore change with the schedule.
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