Natural Gas - Pipe Sizing

Sizing pipes with natural gas - for pressure above 5 psi (35 kPa)

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The tables below can be used for sizing natural gas pipes with pressure above 5 psi (35 kPa).

Capacity of 100 ft Steel Pipe Schedule 40 (MBH, ≈ CFH)
Pressure		Pipe Dimension (in)
Upstream (psig)	Downstream (psig)	1/2	3/4	1	1 1/4	1 1/2	2	2 1/2	3	4	5
10	9.5	355	745	1400	2880	4310	8305	13240	23400	47730	86350
10	9.0	515	1080	2030	4160	6240	12020	19150	33860	69060	124940
9	8.5	350	730	1370	2815	4210	8120	12940	22880	46600	84420
9	8.1	475	995	1875	3850	5770	11100	17700	31300	63840	115500
8	7.6	300	630	1190	2440	3650	7040	11215	19830	40440	76170
8	7.2	440	910	1720	3530	5290	10190	16240	28710	58560	105940
7	6.6	290	615	1160	2380	3565	6865	10940	19345	39460	71390
7	6.3	395	830	1560	3210	4810	9260	14760	26090	53210	96260
6	5.7	245	515	970	1990	2990	5730	9140	16160	32950	59620
6	5.4	355	745	1400	2880	4310	8310	13245	23415	47760	86400
5	4.7	240	500	940	1935	2900	5580	8895	15730	32080	58030
5	4.5	315	660	1240	2540	3810	7340	11695	20680	42170	76300

For natural gas the nominal BTU/cf varies from about 900 to 1100 BTU/cf. In general it is common to set

1 Btu/h = 0.293 W
1 lb = 0.4536 kg
1 ft (foot) = 0.3048 m
1 in water = 248.8 N/m² (Pa) = 0.0361 lb/in² (psi) = 25.4 kg/m² = 0.0739 in mercury
1 psi (lb/in²) = 6,894.8 Pa (N/m²)

natural gas pipe capacity diagram

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