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Gas Pipe Sizing for Iron Pipe at standard gas pressure

Sweepy This chart will give you the size of the gas supply pipe needed, based upon the BTU/HR usage of the gas appliance(s) and the length of pipe used.

Example:
We're plumbing the gas supply for a 60,000btu (60k) furnace and we have to go 40 feet. 
Read across the top of the chart until you come to the 40 ft. column
Read down the 40 ft. column until you come to the first number larger than 60k
The Pipe size column tells you 1/2 inch pipe will make it (See 65k in red on the chart)

Pipe
Size

Length Of Pipe In Feet

10 ft.

20 ft.

30 ft.

40 ft.

50 ft.

60 ft.

70 ft.

80 ft.

3/8"

74k

50k

41k

35k

31k

28k

26k

24k

1/2"

135k

94k

75k

65k

57k

51k

47k

44k

3/4"

285k

195k

156k

133k

118k

108k

98k

92k

1"

533k

359k

292k

251k

220k

200k

184k

174k

1-1/4"

1076k

748k

605k

513k

451k

410k

379k

359k

1-1/2"

1640k

1128k

912k

779k

687k

625k

574k

543k

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