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Gas Pipes - Low Pressure Sizing

Sizing gas pipes for apartment service lines.

With more than one consumer supplied from a service pipe a diversity in consumption as indicated below can be expected:

Gas pipes - capacity and number of apartments - diagram

 

Gas Pipes - Low Pressure Sizing
No. of ApartmentsNominal Size of Gas Pipe (inches)
Length of Service Pipe (feet)
20405060708090100110
4 2 2 2 2 2 2 2 2 2
8 2 2 2 2 2 2 2 2 2
10 2 2 2 2 2 2 2 2 2
12 2 2 2 2 2 2 2 2 2.5
14 2 2 2 2 2 2.5 2.5 2.5 2.5
16 2 2 2 2.5 2.5 2.5 2.5 2.5 2.5
20 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5
24 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 3
30 2.5 2.5 2.5 2.5 3 3 3 3
40 2.5 2.5 3 3 3 3 3 3 4
48 3 3 3 3 3 4 4 4 4
Gas Pipes - Low Pressure Sizing
No. of ApartmentsNominal Size of Gas Pipe (inches)
Length of Service Pipe (feet)
120130140150160170180190200
4 2 2 2 2 2 2 2 2 2
8 2 2 2 2 2 2 2 2 2
10 2 2 2 2.5 2.5 2.5 2.5 2.5 2.5
12 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5
14 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5
16 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5
20 2.5 2.5 2.5 3 3 3 3 3 3
24 3 3 3 3 3 3 3 3 3
30 3 3 3 3 3 3 3 3 3
40 4 4 4 4 4 4 4 4 4
48 4 4 4 4 4 4 4 4 4
  • 1 ft (foot) = 0.3048 m

The table is based on schedule 40 steel pipe and can be used for a low pressure services lines with pressure head 6 inH2O and gas with 0.6 specific gravity and pressure drop 0.3 inH2O.

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