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V. Gas Piping
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A.
Size gas Piping. Design system to provide adequate
gas supply to boiler. Consider these factors:
1. Allowable pressure drop from point of delivery to
boiler. Maximum allowable system pressure is ½
psig. Actual point of delivery pressure may be less;
contact gas supplier for additional information.
Minimum allowable gas valve inlet pressure is
indicated on rating label.
2. Maximum gas demand. Table 5 lists boiler input rate.
Also consider existing and expected future gas
utilization equipment (i.e. water heater, cooking
equipment)
3. Length of piping and number of fittings. Refer to
Table 6 for maximum capacity of Schedule 40 pipe.
Table 7 lists equivalent length for standard fittings.
Table 5: Rated Input
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4. Specific gravity of gas. Gas piping systems for gas
with a specific gravity of 0.70 or less can be sized
directly from Table 6, unless authority having
jurisdiction specifies a gravity factor be applied. For
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specific gravity greater than 0.70, apply gravity
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factor from Table 8. If exact specific gravity is not
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shown choose next higher value.
For materials or conditions other than those listed
above, refer to the National Fuel Gas Code, NFPA
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54/ANSI Z223.1 and/or CAN/CGA B149 Installation
Codes, or size system using standard engineering
methods acceptable to authority having jurisdiction.
B.
Connect boiler gas valve to gas supply system.
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1. Use methods and materials in accordance with local
plumbing codes and requirements of gas supplier. In
absence of such requirements, follow the National
Fuel Gas Code, NFPA 54/ANSI Z223.1 and/or CAN/
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CGA B149 Installation Codes.
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2. Use thread (joint) compound (pipe dope) resistant to
action of liquefied petroleum gas.
1
3. Install sediment trap, ground-joint union and manual
1
shut-off valve upstream of boiler gas valve and
outside jacket. See Figure 26.
1
4. All above ground gas piping upstream from manual
1
gas valve must be electrically continuous and
1
bonded to a grounding electrode. Do not use gas
piping as a grounding electrode. Refer to the
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National Electrical Code, ANSI/NFPA 70 and/or
CSA C22.1 Electrical Code.
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