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VIII Gas Piping
Gaspipingtotheboilermustbesizedtodeliveradequategasfortheboilertoreatthenameplateinputataninlet
pressure between the minimum and maximum values shown in Table 8.2. When sizing, also consider other existing
and expected future gas utilization equipment (i.e. water heater, cooking equipment). For more information on gas line
sizing, consult the utility or the National Fuel Gas Code, NFPA54/ANSI Z223.1, and/or CAN/CSA B149.1 Natural
Gas and Propane Installation Code.
Figure 8.1 shows typical gas piping connection to the boiler. A sediment trap must be installed upstream of all gas
controls. Install the factory provided manual shut-off valve outside the jacket with a ground joint union as shown.
All above ground gas piping upstream from manual shut-off valve must be electrically continuous and bonded to a
grounding electrode. Refer to National Electrical Code, NFPA 70.
The boiler and its gas connection must be leak tested before placing the boiler in operation. When doing this, the boiler
and its individual shut-off must be disconnected from the rest of the system during any pressure testing of that system
at pressures in excess of 1/2 psi (3.5kPa). When pressure testing the gas system at pressures of 1/2 psi (3.5kPa) or
less, isolate the boiler from the gas supply system by closing its individual manual shut-off valve. Locate leaks using
approved combustible gas non-corrosive leak detector solution.
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