Low Pressure Gas Pipe Sizing

Sizing apartments service gas pipe lines

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

gas pipe and number of apartments capacity diagram

 

Nominal Size of Gas Pipe (inches)
No. of Apartments Length of Service Pipe (feet)
20 40 50 60 70 80 90 100 110
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 1/2
14 2 2 2 2 2 2 1/2 2 1/2 2 1/2 2 1/2
16 2 2 2 2 1/2 2 1/2 2 1/2 2  1/2 2 1/2 2 1/2
20 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2
24 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 3
30 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 3 3 3 3
40 2 1/2 2 1/2 3 3 3 3 3 3 4
48 3 3 3 3 3 4 4 4 4
Nominal Size of Gas Pipe (inches)
No. of Apartments Length of Service Pipe (feet)
120 130 140 150 160 170 180 190 200
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 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2
12 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2
14 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2
16 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2
20 2 1/2 2 1/2 2 1/2 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

The table is based on schedule 40 pipe and can be used for a low pressure services at 6 inches of water, gas 0.6 specific gravity and 0.3 inches of water pressure drop.

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