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IV. Gas Piping
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 gas valve inlet pressure for natural gas is
4.5 inch w.c.
2. Maximum gas demand. Table 3 lists boiler input
rate. Also consider existing and expected future gas
utilization equipment (i.e. water heater, cooking
equipment).
3. Lengthofpipingandnumberofttings.Referto
Table 4 for maximum capacity of Schedule 40 pipe
carrying natural gas. Table 5 lists equivalent pipe
lengthforstandardttings.
4. Specicgravityofgas.Correctionsforthespecic
gravity of natural gas can be found in Table 6.
For materials or conditions other than those listed
above, refer to National Fuel Gas Code, NFPA
54/ANSI Z223.1, or size system using standard
engineering methods acceptable to authority having
jurisdiction.
B. Connect boiler gas valve to gas supply system.
1. Use methods and materials in accordance with local
plumbing codes and requirements of gas supplier. In
absence of such requirements, follow National Fuel
Gas Code, NFPA 54/ANSI Z223.1.
Table 3: Rated Input
Figure 5: Steam Piping, PIN4PV, PIN5PV and PIN6PV
Boiler Model
Number
Input Rate
[cubic feet per hour]
Gas
Connection
Size
Natural Gas
PIN3PV 62 ½
PIN4PV 105 ½
PIN5PV 140 ½
PIN6PV 175 ½