GAS PIPING, CONNECTIONS
Before connecting the gas supply, check the rating plate on the right side of the front cover to be sure that the heater is rated for the same gas to which it will be connected.
In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54.
In Canada: The Installation should conform with CGA B149 INSTALLATION CODES and /or local installation codes.
GAS LINE SIZING
FOR NATURAL GAS
Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop of 0.3 in Water Column.
(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands.
Follow boxed numbers for piping just one Aquastar 125FX (example: 3/4” B.I. Natural Gas pipe for 30 ft. will handle 152,000 btu’s). For multiple appliances combine the total btu input load and then refer to applicable chart below.
Nominal |
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Iron |
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Pipe | Internal |
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Size, | Diameter |
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inches | inches | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 125 | 150 175 200 |
| 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 |
33.068
44.026
32 | 22 | 18 | 15 |
72 | 49 | 40 | 34 |
132 | 92 | 73 | 63 |
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278 | 190 | 152 | 130 |
520 | 350 | 285 | 245 |
1050 730 590 500
1600 1100 890 760
3050 2100 1650 1450
4800 3300 2700 2300
8500 5900 4700 4100
17,500 12,000 9,700 8,300
14 | 12 | 11 | 11 | 10 | 9 | 8 | 8 | 7 | 6 | |
30 | 27 | 25 | 23 | 22 | 21 | 18 | 17 | 15 | 14 | |
56 | 50 | 46 | 43 | 40 | 38 | 34 | 31 | 28 | 26 | |
115 | 105 | 96 | 90 | 84 | 79 | 72 | 64 | 59 | 55 | |
215 | 195 | 180 | 170 | 160 | 150 | 130 | 120 | 110 | 100 | |
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440 | 400 | 370 | 350 | 320 | 305 | 275 |
| 250 | 225 | 210 |
670 | 610 | 560 | 530 | 490 | 460 | 410 | 380 | 350 | 320 | |
1270 | 1150 | 1050 | 990 | 930 | 870 | 780 | 710 | 650 | 610 | |
2000 | 1850 | 1700 | 1600 | 1500 | 1400 | 1250 | 1130 | 1050 | 980 | |
3600 | 3250 | 3000 | 2800 | 2600 | 2500 | 2200 | 2000 | 1850 | 1700 | |
7,400 | 6,80 | 6,200 | 5,800 | 5,400 | 5,100 | 4,500 | 4,100 | 3,800 | 3500 |
FOR LP GAS
Maximum Capacity of Pipe in Thousands of BTU per Hour of Undiluted Petroleum Gases (at 11 inches Water Column Inlet Pressure) (Based on a Pressure Drop of 0.5 Inch Wa- ter Column).
Maximum Capacity of
Tubing in Thousands of BTU per Hour of Undiluted Liquified Petroleum Gases (at 11 inches Water Column Inlet Pressure)
(Based on a Pressure Drop of 0.5 Inch Water Column)
Nominal |
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Size, |
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| Length of Pipe, Feet |
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Inches | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 125 | 150 |
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| 1/2 |
| 275 | 189 | 152 | 129 | 114 | 103 | 96 | 89 | 83 | 78 | 69 | 63 |
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| 3/4 | 567 | 693 | 315 |
| 267 | 237 | 217 | 196 | 185 | 173 | 162 | 146 | 132 |
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1 | 107 | 732 | 590 | 504 | 448 | 409 | 378 | 346 | 322 | 307 | 275 | 252 |
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1 1/4 | 220 | 149 | 121 | 103 | 913 | 834 | 771 | 724 | 677 | 630 | 567 | 511 |
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1 1/2 | 330 | 229 | 185 | 155 | 141 | 127 | 118 | 108 | 102 | 976 | 866 | 787 |
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2 | 622 | 433 | 346 | 299 | 264 | 239 | 220 | 204 | 192 | 1811 | 1606 | 1496 |
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| Copper |
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Outside |
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Diameter, |
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Inch | 10 | 20 | 30 | 40 | 50 |
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3/8 | 39 | 26 | 21 | 19 | _ |
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1/2 | 92 | 62 | 50 | 41 | 37 |
| 35 | 31 | 29 | 27 | 26 |
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| 5/8 |
| 199 | 131 | 107 | 90 | 79 |
| 72 | 67 | 62 | 59 | 55 |
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| 3/4 | 329 | 216 |
| 181 | 145 | 131 |
| 121 | 112 | 104 | 95 | 90 |
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| 7/8 | 501 | 346 | 277 | 233 | 198 |
| 187 | 164 | 155 | 146 | 138 |
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*Source National Fuel Gas Code NFPA 54, ANSI Z223.1 - No Additional Allowance is necessary for an ordinary number of fittings
6 720 606 601 | 11 |