Standard 1-1/4" nominal Schedule 40 carbon steel pipe has an exact ASME inside diameter of 1.38 inches, holding 0.0777 US gallons (0.965 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 1-1/4" carbon steel pipe runs.
| Pipe Length (Ft) | US Gallons | Liters | Cubic Feet (ft³) | Fluid Weight (lbs) | Dry Steel (lbs) | Total Wet Weight |
|---|---|---|---|---|---|---|
| 1 ft | 0.078 gal | 0.29 L | 0.010 ft³ | 0.6 lbs | 2.3 lbs | 2.9 lbs |
| 2 ft | 0.155 gal | 0.59 L | 0.021 ft³ | 1.3 lbs | 4.5 lbs | 5.8 lbs |
| 5 ft | 0.389 gal | 1.47 L | 0.052 ft³ | 3.2 lbs | 11.4 lbs | 14.6 lbs |
| 10 ft | 0.777 gal | 2.94 L | 0.104 ft³ | 6.5 lbs | 22.7 lbs | 29.2 lbs |
| 20 ft | 1.554 gal | 5.88 L | 0.208 ft³ | 13.0 lbs | 45.5 lbs | 58.4 lbs |
| 50 ft | 3.89 gal | 14.7 L | 0.52 ft³ | 32.4 lbs | 113.7 lbs | 146.0 lbs |
| 100 ft | 7.77 gal | 29.4 L | 1.04 ft³ | 64.8 lbs | 227.3 lbs | 292.1 lbs |
| 250 ft | 19.43 gal | 73.5 L | 2.60 ft³ | 162.0 lbs | 568.3 lbs | 730.3 lbs |
| 500 ft | 38.85 gal | 147.1 L | 5.20 ft³ | 324.0 lbs | 1136.5 lbs | 1460.5 lbs |
Exact cylinder geometry calculations based on ASME B36.10M inside diameter tolerances.
Divide ASME inside diameter by 2:
r = 1.38" / 2 = 0.6900" Calculate circular internal cross-sectional area:
A = \pi \times (0.6900)^2 = 1.4957 sq in Multiply cross-sectional area by 12 inches (1 linear foot):
V_linear = 1.4957 \times 12 = 17.949 cu in/ft Divide cubic inches by 231 (cubic inches in 1 US Gallon):
Gal/Ft = 17.949 / 231 = 0.0777 Gal/Ft Physical dimensions, structural weights, and pressure thresholds.
Primary Specification Note: Mid-sized commercial heating loops and high-flow industrial fuel gas supply lines.
Navigate directly to adjacent nominal diameters or alternate pipe materials.
Engineering questions and calculations for 1-1/4" carbon steel pipe.
A standard 1-1/4 inch Schedule 40 steel pipe holds 0.0777 US Gallons (0.2941 Liters) of water per linear foot.