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Natural Gas Piping - Sizing of Low Pressure Pipes vs. Capacity

Sizing low pressure natural gas pipe lines - Metric units.

The tables and diagrams below can be used to size natural gas pipes.

Steel Pipe - Schedule 40

Natural Gas - Sizing of Low Pressure Steel Pipes - Schedule 40
Pipe Size
(in)		Capacity of Pipe (kW)
Pipe Length (m)
36122450
1/2 41 28 19 13 9
3/4 86 59 40 28 19
1 161 110 76 52 35
1 1/4 331 228 155 108 72
1 1/2 495 340 235 161 108
2 956 655 450 310 210
2 1/2 1520 1045 720 495 330
3 2690 1850 1270 875 590
4 5490 3775 2595 1780 1200
5 9935 6830 4695 3225 2170
6 16090 11055 7600 5220 3510
8 33050 22715 15615 10730 7210

Natural gas pipe capacity diagram - kW, kPa and meter

  • pressure less than 10 kPa
  • fittings factor 1.5 - equivalent pipe length = pipe length + 50%
  • pressure drop 125 Pa
  • energy content in natural gas 37 MJ/m3
  • steel pipes schedule 40

Copper Tubing - type K

Natural Gas - Sizing of Low Pressure Copper Tubing - type K
Nominal Pipe Size (O.D)
(in)		Capacity of Pipe (kW)
Pipe Length (m)
361224
1/4 (3/8) 6 4 3 2
3/8 (1/2) 13 9 6 4
1/2 (5/8) 26 18 12 8
5/8 (3/4) 46 31 21 15
3/4 (7/8) 65 45 31 21
1 (1 1/8) 140 96 66 45
1 1/4 (1 3/8) 250 170 119 82
  • pressure less than 10 kPa
  • fittings factor 1.5 - equivalent pipe length = pipe length + 50%
  • pressure drop 125 Pa
  • energy content in natural gas 37 MJ/m3
  • copper tubing type K

Copper Tubing - type L

Natural Gas - Sizing of Low Pressure Copper Tubing - type L
Nominal Pipe Size (O.D)
(in)		Capacity of Pipe (kW)
Pipe Length (m)
361224
1/4 (3/8) 7 5 3 2
3/8 (1/2) 15 10 7 5
1/2 (5/8) 29 20 13 9
5/8 (3/4) 49 33 23 16
3/4 (7/8) 75 51 35 24
1 (1 1/8) 150 104 71 49
1 1/4 (1 3/8) 260 180 124 85
  • pressure less than 10 kPa
  • fittings factor 1.5 - equivalent pipe length = pipe length + 50%
  • pressure drop 125 Pa
  • energy content in natural gas 37 MJ/m3
  • copper tubing type L

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