26 inch pipe dimensions: OD and wall thickness by schedule
Deskely Completions team Singapore
A 26 inch pipe, NPS 26 or DN 650, has an outside diameter of 660 mm (26.000 inches) in every schedule. From NPS 14 up the outside diameter in inches equals the nominal size. The schedule sets the wall thickness, and with it the inside diameter and the weight.
The table gives every schedule listed for NPS 26 in ASME B36.10M and B36.19M, in mm and inches.
- Outside diameter: 660 mm (26.000 in), the same for every schedule.
- STD: 9.53 mm wall, 640.9 mm inside diameter.
- XS: 12.70 mm wall, 634.6 mm inside diameter.
- Metric equivalent: DN 650.
26 inch pipe dimensions by schedule
| Schedule | Wall mm (in) | ID mm (in) | kg/m (lb/ft) |
|---|---|---|---|
| Schedule 10 | 7.92 (0.312) | 644.16 (25.361) | 127.36 (85.58) |
| Schedule 20 | 12.70 (0.500) | 634.60 (24.984) | 202.74 (136.23) |
| STD (standard) | 9.53 (0.375) | 640.94 (25.234) | 152.88 (102.73) |
| XS (extra strong) | 12.70 (0.500) | 634.60 (24.984) | 202.74 (136.23) |
Nominal dimensions. Weights are for plain-end carbon steel; stainless steel is about 2 percent heavier. Mill tolerances apply, and your project pipe specification takes precedence.
26 inch pipe outside diameter
The outside diameter of NPS 26 pipe is 660 mm, or 26.000 inches, whatever the schedule, so 26 inch fittings and flanges fit every wall thickness. In metric drawings and specifications the same size is called DN 650.
Nearby sizes
- 24 inch pipe dimensions: OD 610 mm
- 28 inch pipe dimensions: OD 711 mm
Every size and schedule in one table: the pipe schedule chart.
The Deskely products for this
Frequently asked questions
What is the OD of 26 inch pipe?
660 mm (26.000 inches), the same for every schedule.
What is the wall thickness of 26 inch schedule 40 pipe?
9.53 mm (0.375 in), giving an inside diameter of 640.9 mm (25.234 in).
What is the wall thickness of 26 inch schedule 80 pipe?
12.70 mm (0.500 in), giving an inside diameter of 634.6 mm (24.984 in).
What is 26 inch pipe in DN?
DN 650.
How much does 26 inch schedule 40 pipe weigh?
152.88 kg/m (102.73 lb/ft) for plain-end carbon steel.
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