NPS 8 Pipe Dimensions
Outside diameter 8.625 in (219.1 mm) — fixed across every schedule. 14 wall thicknesses from ASME B36.10M, with bore, plain-end weight and flow area for each.
- Nominal size
- NPS 8
- Metric designator
- DN 200
- Outside diameter
- 8.625 in (219.1 mm)
- Schedules listed
- 14
- Standard weight wall
- 0.322 in (8.2 mm)
- Extra strong wall
- 0.500 in (12.7 mm)
Every schedule in NPS 8
Dimensions are given in inches, with the millimetre equivalent beneath in grey.
| Schedule | Wall thickness | Inside diameter | Weight, empty | Flow area (in²) | Water (US gal/ft) |
|---|---|---|---|---|---|
| Sch 5 | 0.1092.77 mm | 8.407213.54 mm | 9.9114.75 kg/m | 55.51 | 2.884 |
| Sch 10 | 0.1483.76 mm | 8.329211.56 mm | 13.4019.94 kg/m | 54.48 | 2.830 |
| Sch 20 | 0.2506.35 mm | 8.125206.38 mm | 22.3633.28 kg/m | 51.85 | 2.693 |
| Sch 30 | 0.2777.04 mm | 8.071205.00 mm | 24.7036.75 kg/m | 51.16 | 2.658 |
| Sch 40 | 0.3228.18 mm | 7.981202.72 mm | 28.5542.49 kg/m | 50.03 | 2.599 |
| STD | 0.3228.18 mm | 7.981202.72 mm | 28.5542.49 kg/m | 50.03 | 2.599 |
| Sch 60 | 0.40610.31 mm | 7.813198.45 mm | 35.6453.04 kg/m | 47.94 | 2.491 |
| Sch 80 | 0.50012.70 mm | 7.625193.67 mm | 43.3964.57 kg/m | 45.66 | 2.372 |
| XS | 0.50012.70 mm | 7.625193.67 mm | 43.3964.57 kg/m | 45.66 | 2.372 |
| Sch 100 | 0.59415.09 mm | 7.437188.90 mm | 50.9575.82 kg/m | 43.44 | 2.257 |
| Sch 120 | 0.71918.26 mm | 7.187182.55 mm | 60.7190.35 kg/m | 40.57 | 2.107 |
| Sch 140 | 0.81220.62 mm | 7.001177.83 mm | 67.76100.83 kg/m | 38.50 | 2.000 |
| Sch 160 | 0.90623.01 mm | 6.813173.05 mm | 74.69111.15 kg/m | 36.46 | 1.894 |
| XXS | 0.87522.22 mm | 6.875174.62 mm | 72.43107.78 kg/m | 37.12 | 1.928 |
Weight is calculated for carbon steel as w = 10.6802 × t × (OD − t) lb/ft and is the plain-end weight, excluding coatings, linings and fittings.
Standard weight equals Schedule 40 in this size. Extra strong equals Schedule 80.
This size, schedule by schedule
A page for each combination, with bore, weight, water capacity and the matching flange and fitting data.
This size in a schedule chart
Common questions
What is the outside diameter of NPS 8 pipe?
NPS 8 pipe has an outside diameter of 8.625 in (219.1 mm). That outside diameter is fixed: it is identical in every schedule, and only the wall thickness — and therefore the bore — changes from one schedule to the next.
How much does NPS 8 schedule 40 pipe weigh?
28.55 lb/ft (42.49 kg/m) as plain-end carbon steel, on a wall thickness of 0.322 in (8.2 mm).
What is the metric equivalent of NPS 8?
DN 200. DN is a dimensionless designator, not a measurement — DN 200 pipe does not measure 200 mm anywhere. Its actual outside diameter is 219.1 mm.