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PAGE 42 — INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07)
TABLE 12. NATURAL GAS SCHEDULE 40 IRON PIPE SIZING
Pipe Size (in.)
Length
(ft.)
1/4
(0.364)
3/8
(0.493)
1/2
(0.622)
3/4
(0.824)
1
(1.049)
1 1/4
(1.380)
1 1/2
(1.610)
2
(2.067)
2 1/2
(2.469)
3
(3.068)
4
(4.026)
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
Pipe and Tube Sizing
MECHANICAL INSTALLATION — FUEL SYSTEM (GASEOUS FUELS)
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 13. NATURAL GAS SEMI-RIGID COPPER TUBING SIZING
Tube Size
(in.)
K&L
1/4 3/8 1/2 5/8 3/4 1 1 1/4 1 1/2 2 2 1/2
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.