15
GAS SUPPLY PIPING
Leak Check Gas Piping
Pressure test boiler and gas connections before placing
boiler in operation.
!
DANGER
Fire Hazard. Do not use matches, candles,
open fl ames, or other methods providing
ignition source. Failure to comply will result in
death or serious injury.
Pressure test over ½ psig (3.5kPa). Disconnect boiler •
and its individual gas shutoff valve from gas supply
system.
Pressure test at ½ psig (3.5kPa) or less. Isolate boiler •
from gas supply system by closing manual gas shutoff
valve.
Locate leakage using gas detector, non-corrosive •
detection fl uid, or other leak detection method
acceptable to authority having jurisdiction. Do not
use matches, candles, open fl ames, or other methods
providing ignition source.
Correct leaks immediately and retest.•
TABLE 7 - GAS SUPPLY PIPE SIZES
Natural Gas
Pipe
Length
(ft)
Pipe Capacity - KBtuh Input
(includes Fittings)
1/2" 3/4" 1" 1 1/4"
20 92 190 350 625
40 63 130 245 445
60 50 105 195 365
Propane Gas
Pipe
Length
(ft)
Pipe Capacity - KBtuh Input
(includes Fittings)
Copper Tube* Iron Pipe
5/8" 3/4" 1/2" 3/4"
20 131 216 189 393
40 90 145 129 267
60 72 121 103 217
* Dimension is outside diameter.
The length of pipe or tubing should be measured from the gas
meter or propane second stage regulator.
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