Use this corrected total distance from the meter for determining the suggested pipe size in the “Single Unit Installation Suggested Gas Pipe Size” table.
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Equivalent Feet |
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| Maximum Capacity for Natural Gas* |
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| MBTU/HR Based on 0.5" W.C. Pressure Drop** |
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From Meter |
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| 2" | 2½" | 3" | 4" | |||
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25 |
| 860 | 1320 | 2475 | 3900 | 7000 | - |
40 |
| 660 | 990 | 1900 | 3000 | 5300 | - |
60 |
| - | 810 | 1520 | 2400 | 4300 | - |
80 |
| - | 690 | 1300 | 2050 | 3700 | - |
100 |
| - | 620 | 1150 | 1850 | 3250 | 6700 |
125 |
| - | - | 1020 | 1650 | 2950 | 6000 |
150 |
| - | - | 950 | 1500 | 2650 | 5500 |
175 |
| - | - | 850 | 1370 | 2450 | 5000 |
200 |
| - | - | 800 | 1280 | 2280 | 4600 |
*Multiplier for Propane: 1.57
**Multiplier for alternate pressure drops: 0.3" W.C. 0.77; 1.0" W.C. 1.41; 2.0" W.C. 2.00; and 4.0" W.C. 2.82.
MULTIPLE UNIT INSTALLATIONS GAS PIPING SIZE CHART
Maximum Capacity of Pipe in Thousands of BTU’s per hour for gas pressures of 14 Inches Water Column (0.5 PSIG) or less and a pressure drop of 0.05 Inch Water Column (Based on NAT GAS, 1025BTU’s per Cubic
Foot of Gas and 0.60 Specific Gravity).
Nominal Iron |
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| Length of Pipe in Straight Feet |
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Pipe Size, |
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Inches | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 125 | 150 | 175 | 200 | |
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3/4 | 369 | 256 | 205 | 174 | 155 | 141 | 128 | 121 | 113 | 106 | 95 | 86 | 79 | 74 | |
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| 1 | 697 | 477 | 384 | 328 | 292 | 267 | 246 | 256 | 210 | 200 | 179 | 164 | 49 | 138 |
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1 | 1/4 | 1400 | 974 | 789 | 677 | 595 | 543 | 502 | 472 | 441 | 410 | 369 | 333 | 308 | 287 |
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1 | 1/2 | 2150 | 1500 | 1210 | 1020 | 923 | 830 | 769 | 707 | 666 | 636 | 564 | 513 | 472 | 441 |
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| 2 | 4100 | 2820 | 2260 | 1950 | 1720 | 1560 | 1440 | 1330 | 1250 | 1180 | 1100 | 974 | 871 | 820 |
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2 | 1/2 | 6460 | 4460 | 3610 | 3100 | 2720 | 2460 | 2310 | 2100 | 2000 | 1900 | 1700 | 1540 | 1400 | 1300 |
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| 3 | 11200 | 7900 | 6400 | 5400 | 4870 | 4410 | 4000 | 3800 | 3540 | 3300 | 3000 | 2720 | 2500 | 2340 |
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| 4 | 23500 | 16100 | 13100 | 11100 | 10000 | 9000 | 8300 | 7690 | 7380 | 6870 | 6150 | 5640 | 5130 | 4720 |
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7.6Appliance Isolation during Gas Supply Piping Pressure Test
1.The appliance and its provided manual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of ½ PSI (3.5 kPa).
2.The appliance must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than ½ PSI (3.5 kPa).
3.The appliance and its gas connection must be
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