Propane Gas Pipe Sizing Chart
Safety note: propane piping must be sized and installed according to local code, appliance requirements, regulator setup, material approvals, and inspection rules. This chart is for planning context only. Use a licensed gas fitter or qualified propane professional for real installations.
Low Pressure Propane Pipe Sizing Chart
The table below summarizes common low-pressure LP gas capacity values in thousands of BTU/hr. Many references assume liquid propane after regulation, 11 inches water column inlet pressure, about 0.5 inches water column pressure drop, and specific gravity around 1.50.
| Pipe length | 1/2 in pipe | 3/4 in pipe | 1 in pipe | 1-1/4 in pipe | 1-1/2 in pipe |
|---|---|---|---|---|---|
| 10 ft | 291 | 608 | 1,146 | 2,353 | 3,525 |
| 20 ft | 200 | 418 | 788 | 1,617 | 2,423 |
| 30 ft | 160 | 336 | 632 | 1,299 | 1,946 |
| 40 ft | 137 | 287 | 541 | 1,111 | 1,665 |
| 50 ft | 122 | 255 | 480 | 985 | 1,476 |
| 60 ft | 110 | 231 | 435 | 892 | 1,337 |
| 80 ft | 94 | 197 | 372 | 763 | 1,144 |
| 100 ft | 84 | 175 | 330 | 677 | 1,014 |
| 125 ft | 74 | 155 | 292 | 600 | 899 |
| 150 ft | 67 | 140 | 265 | 543 | 814 |
How To Use The Chart
- Add approximate equivalent length for fittings; some references use about 5 feet per fitting as a rough planning allowance.
- Size for total connected appliance load, not just one appliance.
- Confirm whether the system is low-pressure, two-stage, or higher-pressure with regulators.
- Check appliance inlet pressure, regulator capacity, pipe material, and local code.
- Do not treat a web chart as a permit drawing or final installation design.
Source Notes
LP gas sizing notes were checked against propane pipe sizing references including Engineering ToolBox propane pipe sizing, Trane’s LP gas pipe sizing chart, and gas-pipe handout references. Local code and a licensed professional control final sizing.
