Dunkirk DCB-165 - Leak Check Gas Piping; Gas Orifice

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7.3 Leak Check Gas Piping
Pressure test boiler and gas connection before placing
boiler in operation.
• Pressure test over 1/2 psig (3.5 kPa). Disconnect

gas supply system.
• Pressure test at 1/2 psig (3.5 kPa) or less.
Isolate boiler from gas supply system by closing

• Locate leakage using gas detector, noncorrosive

acceptable to authority having jurisdiction. Do

methods that can provide ignition source.
• Correct leaks immediately and retest.
7.4 Gas Orice - See Figure 7-2
• Model 100, 115 = 4.6 mm ( Natural & LP)
• Models 125, 150 = 5.8 mm ( Natural & LP)
• Models 165, 205 = 9.0 mm ( Natural & LP)
NOTICE
Sediment trap shall be located upstream of gas
controls.
FIGURE 7-1
7 - GAS SUPPLY PIPING
FIGURE 7-2 Gas Orice Location

Side Down - Toward
gas valve)
Gas Valve
240013360 REV A [07/01/2021]