Multiquip MQP45GM, MQP20IZ, MQP40IZ Pipe and Tube Sizing, Natural GAS Schedule 40 Iron Pipe Sizing

MECHANICAL INSTALLATION — FUEL SYSTEM (GASEOUS FUELS)

Pipe and Tube Sizing

Sizing gas piping for proper fuel delivery, both for flow and pressure is very important.Tables 12 thru 16 show maximum gas capacity for equivalent length for various pipe sizes considering the general fuel sysem operating requirements for proper operation of the generator set. The illustrations (Figures 11 thru 13) are typical pipe configurations for proper natural gas, liquid propane and propane vapor distribution. Consult NFPA 54 or other applicable codes for other operating conditions or other fuel system installation requirements.

Figure 11. Typical Pipe Schematic for Natural Gas Distribution

TABLE 12. NATURAL GAS SCHEDULE 40 IRON PIPE SIZING

Pipe Size (in.)

Length	1/4	3/8	1/2	3/4	1	1 1/4	1 1/2	2	2 1/2	3	4
	(0.364)	(0.493)	(0.622)	(0.824)	(1.049)	(1.380)	(1.610)	(2.067)	(2.469)	(3.068)	(4.026)
(ft.)
			Maximum Capacity in Cubic Feet of Gas per Hour
10	43	95	175	360	680	1400	2100	3950	6300	11000	23000
20	29	65	120	250	465	950	1460	2750	4350	7700	15800
30	24	52	97	200	375	770	1180	2200	3520	6250	12800
40	20	45	82	170	320	660	990	1900	3000	5300	10900
50	18	40	73	151	285	580	900	1680	2650	4750	9700
60	16	36	66	138	260	530	810	1520	2400	4300	8800
70	15	33	61	125	240	490	750	1400	2250	3900	8100
80	14	31	57	118	220	460	690	1300	2050	3700	7500
90	13	29	53	110	205	430	650	1220	1950	3450	7200
100	12	27	50	103	195	400	620	1150	1850	3250	6700
125	11	24	44	93	175	360	550	1020	1650	2950	6000
150	10	22	40	84	160	325	500	950	1500	2650	5500
175	9	20	37	77	145	300	460	850	1370	2450	5000
200	8	19	35	72	135	280	430	800	1280	2280	4600

TABLE 13. NATURAL GAS SEMI-RIGID COPPER TUBING SIZING
Tube Size	K&L		1/4	3/8	1/2	5/8	3/4	1	1 1/4	1 1/2	2	2 1/2
(in.)		ACR	3/8	1/2	5/8	3/4	7/8	1 1/8	1 3/8	1 5/8	2 1/8	2 5/8
Outside			0.375	0.500	0.625	0.750	0.875	1.125	1.375	1.625	2.125	2.625
Inside *			0.305	0.402	0.527	0.652	0.745	0.995	1.245	1.481	1.959	2.435
Length (ft)				Maximum Capacity in Cubic Feet of Gas per Hour
10			27	55	111	195	276	590	1062	1675	3489	6173
20			18	38	77	134	190	406	730	1151	2398	4242
30			15	30	61	107	152	326	586	925	1926	3407
40			13	26	53	92	131	279	502	791	1648	2916
50			11	23	47	82	116	247	445	701	1461	2584
60			10	21	42	74	105	224	403	635	1323	2341
70			9.3	19	39	68	96	206	371	585	1218	2154
80			8.6	18	36	63	90	192	345	544	1133	2004
90			8.1	17	34	59	84	180	324	510	1063	1880
100			7.6	16	32	56	79	170	306	482	1004	1776
125			6.8	14	28	50	70	151	271	427	890	1574
150			6.1	13	26	45	64	136	245	387	806	1426
175			5.6	12	24	41	59	125	226	356	742	1312
200			5.2	11	22	39	55	117	210	331	690	1221
250			4.7	10	20	34	48	103	186	294	612	1082
300			4.2	8.7	18	31	44	94	169	266	554	980

*Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.

PAGE 42 — INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07)