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INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07) — PAGE 43
MECHANICAL INSTALLATION — FUEL SYSTEM (GASEOUS FUELS)
TABLE 14. PROPANE VAPOR SCHEDULE 40 IRON PIPE SIZING
Pipe Size (in.)
Length
(ft.)
1/2
(0.622)
3/4
(0.824)
1
(1.049)
1 1/4
(1.38)
1 1/2
(1.61)
2
(2.067)
3
(3.068)
3 1/2
(3.548)
4
(4.026)
Maximum capacity in thousands of BTU per hour
10
291 608 1145 2352 3523 6786 19119 27993 38997
20
200 418 787 1616 2422 4664 13141 19240 26802
30
160 336 632 1298 1945 3745 10552 15450 21523
40
137 287 541 1111 1664 3205 9031 13223 18421
50
122 255 480 984 1475 2841 8004 11720 16326
60 110 231 434 892 1337 2574 7253 10619 14793
80
94 197 372 763 1144 2203 6207 9088 12661
100
84 175 330 677 1014 1952 5501 8055 11221
125
74 155 292 600 899 1730 4876 7139 9945
150 67 140 265 543 814 1568 4418 6468 9011
200
58 120 227 465 697 1342 3781 5536 7712
250
51 107 201 412 618 1189 3351 4906 6835
300
46 97 182 373 560 1078 3036 4446 6193
350
42 89 167 344 515 991 2793 4090 5698
400
40 83 156 320 479 922 2599 3805 5301
TABLE 15. PROPANE VAPOR 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
45 93 188 329 467 997 1795 2830 5895 10429
20
31 64 129 226 321 685 1234 1945 4051 7168
30
25 51 104 182 258 550 991 1562 3253 5756
40
21 44 89 155 220 471 848 1337 2784 4926
50 19 39 79 138 195 417 752 1185 2468 4366
60
17 35 71 125 177 378 681 1074 2236 3956
70
16 32 66 115 163 348 626 988 2057 3639
80 15 30 61 107 152 324 583 919 1914 3386
90
14 28 57 100 142 304 546 862 1796 3177
100
13 27 54 95 134 287 517 814 1696 3001
125 11 24 48 84 119 254 458 722 1503 2660
150
10 21 44 76 108 230 415 654 1362 2410
175
10 20 40 70 99 212 382 602 1253 2217
200 8.9 18 37 65 92 197 355 560 1166 2062
225
8.3 17 35 61 87 185 333 525 1094 1935
250
7.9 16 33 58 82 175 315 496 1033 1828
275 7.5 15 31 55 78 166 299 471 981 1736
300
7.1 15 30 52 74 158 285 449 936 1656
* Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside
diameter of the copper tubing products.
Figure 12. Typical Pipe Schematic for Propane Vapor Distribution