Installation instructions
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 (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands. Copper tubing is prohibited for use with Natural Gas in the Commonwealth of Massachusetts and not recommended elsewhere.
Follow boxed numbers for piping just one GWH 425 PN (example: ¾” B.I. Natural Gas pipe for 20 ft (6.1m). will handle 190,000 btu’s (55.7 kWh). For multiple appliances combine the total btu input load and then refer to applicable chart below.
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| Nominal |
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| Iron |
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| Length of Black Iron Pipe, Feet |
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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 |
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3/4 | 0.824 | 278 | 190 | 152 | 130 | 115 | 105 | 96 | 90 | 84 | 79 | 72 | 64 | 59 | 55 |
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1 | 1.049 | 520 | 350 | 285 | 245 | 215 | 195 | 180 | 170 | 160 | 150 | 130 | 120 | 110 | 100 |
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1 1/4 | 1.380 | 1050 | 730 | 590 | 500 | 440 | 400 | 370 | 350 | 320 | 305 | 275 | 250 | 225 | 210 |
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Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet
Tube |
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size, |
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inches | EHD* |
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1/2 | 18 EHD 82 | 58 | 47 | 41 | 37 | 34 | |
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3/4 | 23 EHD | 161 | 116 | 96 | 83 | 75 | 68 |
1 | 30 EHD 330 | 231 | 188 | 162 | 144 | 131 | |
1 1/4 | 37 EHD 639 | 456 | 374 | 325 | 292 | 267 | |
*EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing.
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 Water Column).
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| N o minal |
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| Iro n pipe |
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| Black Iron Pipe |
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| size |
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| Lenght of pipe, Feet |
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| inches | 10 | 20 | 30 | 40 | 50 | 60 | 80 | 100 | 125 | 150 | 200 |
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| 1/2 |
| 291 | 200 | 160 | 137 | 122 | 110 | 94 | 84 | 74 | 67 | 58 |
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| 3/4 |
| 608 | 418 | 336 | 287 | 255 | 231 | 197 | 175 | 155 | 140 | 120 |
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| 1 |
| 1145 | 787 | 632 | 541 | 480 | 434 | 372 | 330 | 292 | 265 | 227 |
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*EHD = Equivalent Hydraulic Diameter. The greater the value of EHD, the greater the gas capacity of the tubing.
Length of Flexible Corrugated Stainless Steel Tubing (CSST), Feet
Tube |
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size |
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inches | EHD* |
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1/2 | 18 EHD | 129 | 91 | 74 | 64 | 58 | 53 |
3/4 | 23 EHD 254 | 183 | 151 | 131 | 118 | 107 | |
1 | 30 EHD 521 | 365 | 297 | 256 | 227 | 207 | |
1 1/4 | 37 EHD 971 | 661 | 528 | 449 | 397 | 359 | |
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Maximum Capacity of
(Based on a Pressure Drop of 0.5 Inch Water Column)
*Source National Fuel Gas Code NFPA 54, ANSI Z223.1 - No Additional Allowance is necessary for an ordinary number of fittings
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| Copper (LP gas only) |
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Outside |
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| Length of Tubing, Feet |
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diameter |
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Inch | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
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3/8 | 39 | 26 | 21 | 19 | _ | _ | _ | _ | _ | _ |
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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Fig. 14
12 | 6 720 608 034 |