PipeData

Schedule 160 Pipe Dimensions

Wall thickness, bore and plain-end weight for all 23 sizes ASME B36.10M publishes in schedule 160, NPS 1/8 through NPS 24.

Schedule
Schedule 160
Sizes published
23 (NPS 1/8 to NPS 24)
Thinnest wall
0.124 in (3.1 mm) at NPS 1/8
Thickest wall
2.344 in (59.5 mm) at NPS 24
Standard
ASME B36.10M

Where schedule 160 is used

Schedule 160 is the heaviest numbered schedule. It is used for high-pressure process and power piping, and in small sizes for the vents, drains and instrument connections on high-pressure lines.

Pipe wall thickness to scale, Schedule 160Pipe cross-sections drawn to scale at the same outside diameter so the wall thicknesses can be compared. NPS 1/8: 0.124 in wall on 0.405 in OD; NPS 4: 0.531 in wall on 4.500 in OD; NPS 24: 2.344 in wall on 24.000 in ODNPS 1/80.124 in wall on 0.405 in ODNPS 40.531 in wall on 4.500 in ODNPS 242.344 in wall on 24.000 in OD
Schedule 160 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 160 in every size

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

ASME B36.10M schedule 160 dimensions.
SizeDNOutside diameterWall thicknessInside diameterWeight, emptyWater (US gal/ft)This size
NPS 1/8DN 60.40510.29 mm0.1243.15 mm0.1573.99 mm0.370.55 kg/m0.001all schedules →
NPS 1/4DN 80.54013.72 mm0.1453.68 mm0.2506.35 mm0.610.91 kg/m0.003all schedules →
NPS 3/8DN 100.67517.14 mm0.1584.01 mm0.3599.12 mm0.871.30 kg/m0.005all schedules →
NPS 1/2DN 150.84021.34 mm0.1884.78 mm0.46411.79 mm1.311.95 kg/m0.009all schedules →
NPS 3/4DN 201.05026.67 mm0.2195.56 mm0.61215.54 mm1.952.90 kg/m0.015all schedules →
NPS 1DN 251.31533.40 mm0.2506.35 mm0.81520.70 mm2.854.24 kg/m0.027all schedules →
NPS 1 1/4DN 321.66042.16 mm0.2506.35 mm1.16029.46 mm3.775.61 kg/m0.055all schedules →
NPS 1 1/2DN 401.90048.26 mm0.2817.14 mm1.33833.99 mm4.867.24 kg/m0.073all schedules →
NPS 2DN 502.37560.32 mm0.3448.74 mm1.68742.85 mm7.4711.11 kg/m0.116all schedules →
NPS 2 1/2DN 652.87573.02 mm0.3759.52 mm2.12553.97 mm10.0214.91 kg/m0.184all schedules →
NPS 3DN 803.50088.90 mm0.43811.13 mm2.62466.65 mm14.3421.34 kg/m0.281all schedules →
NPS 4DN 1004.500114.30 mm0.53113.49 mm3.43887.33 mm22.5333.53 kg/m0.482all schedules →
NPS 5DN 1255.563141.30 mm0.62515.88 mm4.313109.55 mm32.9949.10 kg/m0.759all schedules →
NPS 6DN 1506.625168.27 mm0.71918.26 mm5.187131.75 mm45.3967.55 kg/m1.098all schedules →
NPS 8DN 2008.625219.07 mm0.90623.01 mm6.813173.05 mm74.76111.25 kg/m1.894all schedules →
NPS 10DN 25010.750273.05 mm1.12528.57 mm8.500215.90 mm115.75172.26 kg/m2.948all schedules →
NPS 12DN 30012.750323.85 mm1.31233.32 mm10.126257.20 mm160.42238.73 kg/m4.183all schedules →
NPS 14DN 35014.000355.60 mm1.40635.71 mm11.188284.18 mm189.29281.69 kg/m5.107all schedules →
NPS 16DN 40016.000406.40 mm1.59440.49 mm12.812325.42 mm245.48365.31 kg/m6.697all schedules →
NPS 18DN 45018.000457.20 mm1.78145.24 mm14.438366.73 mm308.79459.53 kg/m8.505all schedules →
NPS 20DN 50020.000508.00 mm1.96950.01 mm16.062407.97 mm379.53564.80 kg/m10.526all schedules →
NPS 22DN 55022.000558.80 mm2.12553.97 mm17.750450.85 mm451.49671.88 kg/m12.855all schedules →
NPS 24DN 60024.000609.60 mm2.34459.54 mm19.312490.52 mm542.64807.54 kg/m15.216all 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 160 is 0.124 in (3.1 mm) at NPS 1/8 and 2.344 in (59.5 mm) at NPS 24. Measured against the pipe it belongs to, that is 30.6% of the outside diameter at the small end and 9.8% 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 160 holds about 6,849 psig at NPS 1 1/4 and about 4,187 psig at NPS 22. A schedule is therefore chosen size by size, from a calculation, and not once for a whole plant.

Guides and comparisons for this page

Schedule 40 vs Schedule 160How far the bore closes up on the heavy wall.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 160 pipe made in?

ASME B36.10M publishes schedule 160 in 23 sizes, from NPS 1/8 through NPS 24. Wall thickness runs from 0.124 in (3.1 mm) at the small end to 2.344 in (59.5 mm) at the large end.

Does schedule 160 mean the same wall thickness in every size?

No. It is a series, not a thickness. The wall is 0.124 in (3.1 mm) at NPS 1/8 and 2.344 in (59.5 mm) at NPS 24, so the thickness always has to be read off the table for the size in hand.

How pipe schedules work →