Low Pressure Gas Pipe Sizing

Sizing service gas pipes connecting apartments

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With more than one consumer supplied from the same service pipe, a certain diversity can be expected as shown in the diagram and tables below:

gas pipe and number of apartments capacity diagram

Nominal Size of Gas Pipe (inch)
No. of Apartments	Length of Service Pipe (feet)
No. of Apartments	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	2½
14	2	2	2	2	2	2½	2½	2½	2½
16	2	2	2	2½	2½	2½	2½	2½	2½
20	2½	2½	2½	2½	2½	2½	2½	2½	2½
24	2½	2½	2½	2½	2½	2½	2½	2½	3
30	2½	2½	2½	2½	2½	3	3	3	3
40	2½	2½	3	3	3	3	3	3	4
48	3	3	3	3	3	4	4	4	4

Nominal Size of Gas Pipe (inch)
No. of Apartments	Length of Service Pipe (feet)
No. of Apartments	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	2½	2½	2½	2½	2½	2½
12	2½	2½	2½	2½	2½	2½	2½	2½	2½
14	2½	2½	2½	2½	2½	2½	2½	2½	2½
16	2½	2½	2½	2½	2½	2½	2½	2½	2½
20	2½	2½	2½	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 at 0.6 specific gravity and 0.3 inches of water pressure drop.

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Low Pressure Gas Pipe Sizing

Sizing service gas pipes connecting apartments

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