PipeData

Schedule 80 Pipe Dimensions

Wall thickness, bore and plain-end weight for all 24 sizes ASME B36.10M publishes in schedule 80, NPS 1/8 through NPS 24.

Schedule
Schedule 80
Sizes published
24 (NPS 1/8 to NPS 24)
Thinnest wall
0.095 in (2.4 mm) at NPS 1/8
Thickest wall
1.219 in (31.0 mm) at NPS 24
Standard
ASME B36.10M

Where schedule 80 is used

Schedule 80 is the usual heavy wall. It is chosen for higher pressure, for a larger corrosion allowance, and very commonly for small-bore lines, where the extra wall gives threaded and socket-welded pipe the mechanical strength to survive being stood on or knocked.

Pipe wall thickness to scale, Schedule 80Pipe cross-sections drawn to scale at the same outside diameter so the wall thicknesses can be compared. NPS 1/8: 0.095 in wall on 0.405 in OD; NPS 4: 0.337 in wall on 4.500 in OD; NPS 24: 1.219 in wall on 24.000 in ODNPS 1/80.095 in wall on 0.405 in ODNPS 40.337 in wall on 4.500 in ODNPS 241.219 in wall on 24.000 in OD
Schedule 80 in three sizes, each drawn to its own scale. The sections are drawn at the same width so that the wall can be compared with the diameter it belongs to. The wall gets thicker as the size goes up, but it takes up a smaller share of the pipe.

Schedule 80 in every size

Dimensions are given in inches, with the millimetre equivalent beneath in grey.

ASME B36.10M schedule 80 dimensions.
SizeDNOutside diameterWall thicknessInside diameterWeight, emptyWater (US gal/ft)This size
NPS 1/8DN 60.40510.29 mm0.0952.41 mm0.2155.46 mm0.310.47 kg/m0.002all schedules →
NPS 1/4DN 80.54013.72 mm0.1193.02 mm0.3027.67 mm0.540.80 kg/m0.004all schedules →
NPS 3/8DN 100.67517.14 mm0.1263.20 mm0.42310.74 mm0.741.10 kg/m0.007all schedules →
NPS 1/2DN 150.84021.34 mm0.1473.73 mm0.54613.87 mm1.091.62 kg/m0.012all schedules →
NPS 3/4DN 201.05026.67 mm0.1543.91 mm0.74218.85 mm1.482.20 kg/m0.022all schedules →
NPS 1DN 251.31533.40 mm0.1794.55 mm0.95724.31 mm2.173.23 kg/m0.037all schedules →
NPS 1 1/4DN 321.66042.16 mm0.1914.85 mm1.27832.46 mm3.004.46 kg/m0.067all schedules →
NPS 1 1/2DN 401.90048.26 mm0.2005.08 mm1.50038.10 mm3.635.41 kg/m0.092all schedules →
NPS 2DN 502.37560.32 mm0.2185.54 mm1.93949.25 mm5.037.48 kg/m0.153all schedules →
NPS 2 1/2DN 652.87573.02 mm0.2767.01 mm2.32359.00 mm7.6711.41 kg/m0.220all schedules →
NPS 3DN 803.50088.90 mm0.3007.62 mm2.90073.66 mm10.2615.27 kg/m0.343all schedules →
NPS 3 1/2DN 904.000101.60 mm0.3188.08 mm3.36485.45 mm12.5218.63 kg/m0.462all schedules →
NPS 4DN 1004.500114.30 mm0.3378.56 mm3.82697.18 mm15.0022.32 kg/m0.597all schedules →
NPS 5DN 1255.563141.30 mm0.3759.52 mm4.813122.25 mm20.8030.95 kg/m0.945all schedules →
NPS 6DN 1506.625168.27 mm0.43210.97 mm5.761146.33 mm28.6042.56 kg/m1.354all schedules →
NPS 8DN 2008.625219.07 mm0.50012.70 mm7.625193.67 mm43.4364.63 kg/m2.372all schedules →
NPS 10DN 25010.750273.05 mm0.59415.09 mm9.562242.87 mm64.4995.97 kg/m3.730all schedules →
NPS 12DN 30012.750323.85 mm0.68817.48 mm11.374288.90 mm88.71132.02 kg/m5.278all schedules →
NPS 14DN 35014.000355.60 mm0.75019.05 mm12.500317.50 mm106.23158.09 kg/m6.375all schedules →
NPS 16DN 40016.000406.40 mm0.84421.44 mm14.312363.52 mm136.74203.50 kg/m8.357all schedules →
NPS 18DN 45018.000457.20 mm0.93823.83 mm16.124409.55 mm171.08254.60 kg/m10.607all schedules →
NPS 20DN 50020.000508.00 mm1.03126.19 mm17.938455.63 mm209.06311.12 kg/m13.128all schedules →
NPS 22DN 55022.000558.80 mm1.12528.57 mm19.750501.65 mm251.05373.60 kg/m15.915all schedules →
NPS 24DN 60024.000609.60 mm1.21930.96 mm21.562547.67 mm296.86441.78 kg/m18.969all schedules →

Weight is plain-end carbon steel, w = 10.69 × t × (OD − t) lb/ft.

How the wall changes with size

The wall in schedule 80 is 0.095 in (2.4 mm) at NPS 1/8 and 1.219 in (31.0 mm) at NPS 24. Measured against the pipe it belongs to, that is 23.5% of the outside diameter at the small end and 5.1% at the large end, so the wall does not keep pace with the diameter. The pressure the pipe will hold moves the same way. On the basis used throughout this site (ASME B31.3, S = 20,000 psi, nominal wall, no corrosion allowance) schedule 80 holds about 6,647 psig at NPS 3/4 and about 2,118 psig at NPS 24. A schedule is therefore chosen size by size, from a calculation, and not once for a whole plant.

In this schedule the wall thickness coincides with XS in NPS 1/8 through NPS 8. Outside those sizes it does not, so never substitute one designation for the other without checking the number.

Guides and comparisons for this page

Schedule 40 vs Schedule 80Wall, bore, weight and pressure capacity, size by size.What a pipe schedule actually isWhy a schedule is a wall series and not a thickness.Pipe wall thickness calculationBarlow and ASME B31.3, corrosion allowance and mill tolerance.Pipe sizing by flow rate and velocityTurn a flow rate into a line size using velocity limits.

Common questions

What sizes is schedule 80 pipe made in?

ASME B36.10M publishes schedule 80 in 24 sizes, from NPS 1/8 through NPS 24. Wall thickness runs from 0.095 in (2.4 mm) at the small end to 1.219 in (31.0 mm) at the large end.

Does schedule 80 mean the same wall thickness in every size?

No. It is a series, not a thickness. The wall is 0.095 in (2.4 mm) at NPS 1/8 and 1.219 in (31.0 mm) at NPS 24, so the thickness always has to be read off the table for the size in hand.

How pipe schedules work →