Standard 3" nominal Schedule 40 carbon steel pipe has an exact ASME inside diameter of 3.068 inches, holding 0.384 US gallons (4.768 liters per meter) per linear foot. Part of our Gas Pipe Volume Calculator and universal Pipe Volume Calculator suite.
Calculations are based on cylindrical formula \(V = \pi r^2 L\). Verify dimensions against manufacturer specs for code submittals.
Volumetric liquid holding capacity and dry/wet mechanical loads for 3" carbon steel pipe runs.
| Pipe Length (Ft) | US Gallons | Liters | Cubic Feet (ft³) | Fluid Weight (lbs) | Dry Steel (lbs) | Total Wet Weight |
|---|---|---|---|---|---|---|
| 1 ft | 0.384 gal | 1.45 L | 0.051 ft³ | 3.2 lbs | 7.6 lbs | 10.8 lbs |
| 2 ft | 0.768 gal | 2.91 L | 0.103 ft³ | 6.4 lbs | 15.2 lbs | 21.6 lbs |
| 5 ft | 1.920 gal | 7.27 L | 0.257 ft³ | 16.0 lbs | 37.9 lbs | 53.9 lbs |
| 10 ft | 3.840 gal | 14.53 L | 0.513 ft³ | 32.0 lbs | 75.8 lbs | 107.8 lbs |
| 20 ft | 7.680 gal | 29.07 L | 1.026 ft³ | 64.1 lbs | 151.5 lbs | 215.6 lbs |
| 50 ft | 19.20 gal | 72.7 L | 2.56 ft³ | 160.2 lbs | 378.8 lbs | 539.0 lbs |
| 100 ft | 38.40 gal | 145.3 L | 5.13 ft³ | 320.3 lbs | 757.6 lbs | 1077.9 lbs |
| 250 ft | 96.00 gal | 363.3 L | 12.82 ft³ | 800.8 lbs | 1894.0 lbs | 2694.8 lbs |
| 500 ft | 192.00 gal | 726.6 L | 25.65 ft³ | 1601.5 lbs | 3788.0 lbs | 5389.5 lbs |
Exact cylinder geometry calculations based on ASME B36.10M inside diameter tolerances.
Divide ASME inside diameter by 2:
r = 3.068" / 2 = 1.5340" Calculate circular internal cross-sectional area:
A = \pi \times (1.5340)^2 = 7.3927 sq in Multiply cross-sectional area by 12 inches (1 linear foot):
V_linear = 7.3927 \times 12 = 88.712 cu in/ft Divide cubic inches by 231 (cubic inches in 1 US Gallon):
Gal/Ft = 88.712 / 231 = 0.384 Gal/Ft Physical dimensions, structural weights, and pressure thresholds.
Primary Specification Note: Large commercial central mechanical rooms supplying multi-hundred GPM heating/cooling hydronic loops.
Navigate directly to adjacent nominal diameters or alternate pipe materials.
Engineering questions and calculations for 3" carbon steel pipe.
A standard 3 inch Schedule 40 steel pipe holds 0.3840 US Gallons (1.4535 Liters) of water per linear foot.