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Propane Gas Piping - Low Pressure Capacity vs. Size

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The tables and diagrams below can be used for sizing propane gas pipes.

Steel Pipe - Schedule 40

Propane Gas - Low Pressure Capacities in Steel Pipes Schedule 40
Pipe Size
(in)		Capacity of Pipe (MBH)
Pipe Length (ft)
10204080150300
1/2 235 160 110 75 55 35
3/4 490 340 230 160 115 80
1 925 640 440 300 215 145
1 1/4 1900 1305 900 620 440 300
1 1/2 2850 1960 1345 925 660 450
2 5490 3770 2590 1780 1270 870
2 1/2 8740 6010 4130 2840 2020 1390
3 15455 10620 7300 5020 3570 2450
4 31525 21670 14890 10230 7280 5010
5 57030 39200 26940 18520 13180 9060
6 92350 63470 43620 29980 21340 14665
8 189750 130410 89630 61600 43840 30135
  • pressure less than 1 1/2 psig
  • fittings factor 1.5 - equivalent pipe length = pipe length + 50%
  • pressure drop 0.5 inches water column
  • energy content in propane gas 2520 Btu/cu ft
  • One MBH is equivalent to 1000 BTU's per hour
  • 1 CFH ≈ 2.54 MBH
  • steel pipes schedule 40

Copper Tubing - type K

Propane Gas - Low Pressure Capacities in Copper Tubes - type K
Capacity of Pipe (MBH)
Nominal Pipe Size (O.D)
(in)		Pipe Length (ft)
10204080
1/4 (3/8) 35 25 17 12
3/8 (1/2) 75 50 35 25
1/2 (5/8) 150 105 70 50
5/8 (3/4) 265 180 125 85
3/4 (7/8) 380 260 180 120
1 (1 1/8) 805 555 380 260
1 1/4 (1 3/8) 1450 995 685 470
  • pressure less than 1 1/2 psig
  • fittings factor 1.5 - equivalent pipe length = pipe length + 50%
  • pressure drop 0.5 inches water column
  • energy content in propane gas 2500 Btu/cu ft
  • One MBH is equivalent to 1000 BTU's per hour
  • 1 CFH ≈ 2.54 MBH
  • copper tubing type K

Copper Tubing - type L

Propane Gas - Low Pressure Capacities in Copper Tubes - type L
Capacity of Pipe (MBH)
Nominal Pipe Size (O.D)
(in)		Pipe Length (ft)
10204080
1/4 (3/8) 40 25 20 13
3/8 (1/2) 90 60 40 30
1/2 (5/8) 165 115 80 55
5/8 (3/4) 280 190 135 90
3/4 (7/8) 430 295 205 140
1 (1 1/8) 870 600 410 280
1 1/4 (1 3/8) 1510 1040 710 490
  • pressure less than 1 1/2 psig
  • fittings factor 1.5 - equivalent pipe length = pipe length + 50%
  • pressure drop 0.5 inches water column
  • energy content in propane gas 2500 Btu/cu ft
  • One MBH is equivalent to 1000 BTU's per hour
  • 1 CFH ≈ 2.54 MBH
  • copper tubing type L
  • 1 Btu/h = 0.293 W
  • 1 lb = 0.4536 kg
  • 1 ft (foot) = 0.3048 m
  • 1 in water = 248.8 N/m2 (Pa) = 0.0361 lb/in2 (psi) = 25.4 kg/m2 = 0.0739 in mercury
  • 1 psi (lb/in2) = 6,894.8 Pa (N/m2)
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