Gas Line Sizing

Maximum Delivery Capacity of Cubic Feet of Gas Per Hour of IPS Pipe Carrying Natural Gas of 0.60 Specific Gravity

(Based on a Pressure Drop of 0.5 Inch Water Column)

Pipe Size	10	20	30	40	50	60	70	80	90	100	125
1/2	174	119	96	82	73	66	61	56	53	50	44
3/4	363	249	200	171	152	138	127	118	111	104	93
1	684	470	377	323	286	259	239	222	208	197	174
1-1/4	1404	965	775	663	588	532	490	456	428	404	358
1-1/2	2103	1445	1161	993	880	798	734	683	641	605	536
2	4050	2784	2235	1913	1696	1536	1413	1315	1234	1165	1033
2-1/2	6455	4437	3563	3049	2703	2449	2253	2096	1966	1857	1646
3	11412	7843	6299	5391	4778	4329	3983	3705	3476	3284	2910
3-1/2	16709	11484	9222	7893	6995	6338	5831	5425	5090	4808	5261
4	23277	15998	12847	10995	9745	8830	8123	7557	7091	6698	5936

Pipe Size	150	200	250	300	350	400	450	500	550	600
1/2	40	34	30	28	25	24	22	21	20	19
3/4	84	72	64	58	53	49	46	44	42	40
1	158	135	120	109	100	93	87	82	78	75
1-1/4	324	278	246	223	205	191	179	169	161	153
1-1/2	486	416	369	334	307	286	268	253	241	230
2	936	801	710	643	592	551	517	488	463	442
2-1/2	1492	1277	1131	1025	943	877	823	778	739	705
3	2637	2257	2000	1812	1667	1551	1455	1375	1306	1246
3-1/2	3861	3304	2929	2654	2441	2271	2131	2013	1912	1824
4	5378	4603	4080	3697	3401	3164	2968	2804	2663	2541

Common Vent Capacity – Type B Double Wall Vent

Combined Appliance Input Rating in Thousands of BTU Per Hour

Total Vent Height	4	5	6	7	8	10	12	14	16	18	20	22	24
6	65	103	147	200	260	410	588	815	1065	1345	1660	1970	2390
8	73	114	163	223	290	465	652	912	1190	1510	1860	2200	2680
10	79	124	178	242	315	495	712	995	1300	1645	2030	2400	2920
15	91	144	206	280	365	565	825	1158	1510	1910	2360	2790	3400
20	102	160	229	310	405	640	916	1290	1690	2140	2640	3120	3800
30	118	185	266	360	470	740	1025	1525	1990	2520	3110	3680	4480
40	131	203	295	1405	525	820	1180	1715	2240	2830	3500	4150	5050
60	NR	224	324	440	575	900	1380	2010	2620	3320	4100	4850	5900
80	NR	NR	344	468	610	955	1540	2250	2930	3710	4590	5420	6600
100	NR	NR	NR	479	625	975	1670	2450	3200	4050	5000	5920	7200

Gas Pipe Sizing Guide

Maximum Capacity of Pipe in Thousands of BTU per Hour of Undiluted Liquified Petrolium Gases (LPG)

(Based on a Pressure Drop of 0.5 Inch Water Column) Low Pressure 11″ Water Column

Pipe Size	10	20	30	40	50	60	70	80	90	100	125	150	200
1/2	275	189	152	129	114	103	96	89	83	78	69	63	55
3/4	567	393	315	267	237	217	196	185	173	162	146	132	112
1	1071	732	590	504	448	409	378	346	322	307	275	252	213
1-1/4	2205	1496	1212	1039	913	834	771	724	677	630	567	511	440
1-1/2	3307	2299	1858	1559	1417	1275	1181	1086	1023	976	866	787	675
2	6221	4331	3465	2992	2646	2394	2205	2047	1921	1811	1606	1496	1260