Formula
ID = OD − 2·wall · Area = π(ID/2)² · Weight/ft = ρ·(A_metal)·12Look up dimensions, weight, working pressure, internal volume and rough CFM capacity for the piping materials common in compressed-air systems.
Outside diameter
1.660in
42.2 mm
Inside diameter
1.380in
35.1 mm
Wall thickness
0.140in
3.56 mm
Cross-section
1.496in²
965 mm²
Weight
2.28lb/ft
3.39 kg/m
Internal volume
0.0777gal/ft
0.965 L/m
Pressure check
OK
Rated 700 psi · line 125 psi · safety factor 5.6×
Compressed-air code typically requires 4× safety factor on burst pressure.
Approx. flow capacity
11cfm
At 125 psig over 100 ft, ≈ 2 psi/100 ft drop target
Material notes
Standard compressed-air header material. NPT threaded or welded.
Full size chart — Carbon steel — Sch 40 (A53/A106)
| NPS | OD (in) | Wall | ID | Area (in²) | lb/ft | gal/ft | WP psi |
|---|---|---|---|---|---|---|---|
| 1/8" | 0.405 | 0.068 | 0.269 | 0.057 | 0.25 | 0.0030 | 700 |
| 1/4" | 0.540 | 0.088 | 0.364 | 0.104 | 0.43 | 0.0054 | 700 |
| 3/8" | 0.675 | 0.091 | 0.493 | 0.191 | 0.57 | 0.0099 | 700 |
| 1/2" | 0.840 | 0.109 | 0.622 | 0.304 | 0.85 | 0.0158 | 700 |
| 3/4" | 1.050 | 0.113 | 0.824 | 0.533 | 1.13 | 0.0277 | 700 |
| 1" | 1.315 | 0.133 | 1.049 | 0.864 | 1.68 | 0.0449 | 700 |
| 1-1/4" | 1.660 | 0.140 | 1.380 | 1.496 | 2.28 | 0.0777 | 700 |
| 1-1/2" | 1.900 | 0.145 | 1.610 | 2.036 | 2.72 | 0.1058 | 700 |
| 2" | 2.375 | 0.154 | 2.067 | 3.356 | 3.66 | 0.1743 | 700 |
| 2-1/2" | 2.875 | 0.203 | 2.469 | 4.788 | 5.80 | 0.2487 | 700 |
| 3" | 3.500 | 0.216 | 3.068 | 7.393 | 7.58 | 0.3840 | 700 |
| 4" | 4.500 | 0.237 | 4.026 | 12.730 | 10.80 | 0.6613 | 700 |
| 6" | 6.625 | 0.280 | 6.065 | 28.890 | 18.99 | 1.5008 | 700 |
| 8" | 8.625 | 0.322 | 7.981 | 50.027 | 28.58 | 2.5988 | 700 |