Propane Gas Pipe Sizing Chart

The tables you can see below are designed to be used with propane gas pipes sizing. There are three of them. The first table refers to steel tubing. You can see the pipe size in inches and the pipe length related to the overall capacity. Other factors we can add at this point include pressure under 1 ½ psi, fitting factor is 1.5 per pipe length +50% and energy content in propane is 2520 Btu/cu ft.

The second table refers to pipe type K which is made from copper. You can also see the nominal pipe size or O. D in inches and the capacity of the pipe per its length. The same directions and the same measurements are used as with the first table.

The third table is for copper pipes but type L. Once again you have a table with the nominal pipe size and the overall capacity of that pipe per its length.

Steel Pipe – Schedule 40

Capacity of Pipe (MBH)

Pipe SizePipe Length 10 feetPipe Length 20 feetPipe Length 40 feetPipe Length 80 feetPipe Length 150 feetPipe Length 300 feet
1/2235160110755535
3/449034023016011580
1925640440300215145
1 1/419001305900620440300
1 1/2285019601345925660450
254903770259017801270870
2 1/2874060104130284020201390
315455106207300502035702450
43152521670148901023072805010
557030392002694018520131809060
6923506347043620299802134014665
818975013041089630616004384030135

Copper Tubing – type K

Capacity of Pipe (MBH)

Pipe sizePipe Length 10 feetPipe Length 20 feetPipe Length 40 feetPipe Length 80 feet
1/4 (3/8)35251712
3/8 (1/2)75503525
1/2 (5/8)1501057050
5/8 (3/4)26518012585
3/4 (7/8)380260180120
1 (1 1/8)805555380260
1 1/4 (1 3/8)1450995685470

Copper Tubing – type L

Capacity of Pipe (MBH)

Pipe sizePipe Length 10 feetPipe Length 20 feetPipe Length 40 feetPipe Length 80 feet
1/4 (3/8)40252013
3/8 (1/2)90604030
1/2 (5/8)1651158055
5/8 (3/4)28019013590
3/4 (7/8)430295205140
1 (1 1/8)870600410280
1 1/4 (1 3/8)15101040710490

Here is a video that explains how to install gas line:

We also did a review of the best gas propane heaters for your garage.