8 inch pipe dimensions: OD and wall thickness by schedule
Deskely Completions team Singapore
A 8 inch pipe, NPS 8 or DN 200, has an outside diameter of 219.1 mm (8.625 inches) in every schedule. The nominal size is a name, not a measurement: the outside diameter is larger than 8 inch. The schedule sets the wall thickness, and with it the inside diameter and the weight.
The table gives every schedule listed for NPS 8 in ASME B36.10M and B36.19M, in mm and inches.
- Outside diameter: 219.1 mm (8.625 in), the same for every schedule.
- Schedule 40: 8.18 mm wall, 202.7 mm inside diameter.
- Schedule 80: 12.70 mm wall, 193.7 mm inside diameter.
- Metric equivalent: DN 200.
8 inch pipe dimensions by schedule
| Schedule | Wall mm (in) | ID mm (in) | kg/m (lb/ft) |
|---|---|---|---|
| Schedule 5S | 2.77 (0.109) | 213.56 (8.408) | 14.78 (9.93) |
| Schedule 10S | 3.76 (0.148) | 211.58 (8.330) | 19.97 (13.42) |
| Schedule 20 | 6.35 (0.250) | 206.40 (8.126) | 33.32 (22.39) |
| Schedule 30 | 7.04 (0.277) | 205.02 (8.072) | 36.82 (24.74) |
| STD (standard) | 8.18 (0.322) | 202.74 (7.982) | 42.55 (28.59) |
| Schedule 40 | 8.18 (0.322) | 202.74 (7.982) | 42.55 (28.59) |
| Schedule 60 | 10.31 (0.406) | 198.48 (7.814) | 53.09 (35.67) |
| XS (extra strong) | 12.70 (0.500) | 193.70 (7.626) | 64.64 (43.44) |
| Schedule 80 | 12.70 (0.500) | 193.70 (7.626) | 64.64 (43.44) |
| Schedule 100 | 15.09 (0.594) | 188.92 (7.438) | 75.92 (51.02) |
| Schedule 120 | 18.26 (0.719) | 182.58 (7.188) | 90.44 (60.77) |
| Schedule 140 | 20.62 (0.812) | 177.86 (7.002) | 100.93 (67.82) |
| Schedule 160 | 23.01 (0.906) | 173.08 (6.814) | 111.27 (74.77) |
| XXS (double extra strong) | 22.23 (0.875) | 174.64 (6.876) | 107.93 (72.52) |
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.
8 inch pipe outside diameter
The outside diameter of NPS 8 pipe is 219.1 mm, or 8.625 inches, whatever the schedule, so 8 inch fittings and flanges fit every wall thickness. In metric drawings and specifications the same size is called DN 200.
It is larger than 8 inch because, below NPS 14, the nominal size is a traditional name that once roughly matched the bore, not the outside.
Nearby sizes
- 6 inch pipe dimensions: OD 168.3 mm
- 10 inch pipe dimensions: OD 273.1 mm
Every size and schedule in one table: the pipe schedule chart.
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Frequently asked questions
What is the OD of 8 inch pipe?
219.1 mm (8.625 inches), the same for every schedule.
What is the wall thickness of 8 inch schedule 40 pipe?
8.18 mm (0.322 in), giving an inside diameter of 202.7 mm (7.982 in).
What is the wall thickness of 8 inch schedule 80 pipe?
12.70 mm (0.500 in), giving an inside diameter of 193.7 mm (7.626 in).
What is 8 inch pipe in DN?
DN 200.
How much does 8 inch schedule 40 pipe weigh?
42.55 kg/m (28.59 lb/ft) for plain-end carbon steel.
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