Section 2 — Installation
Part No. 750-363 2-13
2.7.6 Gas Header
Design of a single common gas header with individual takeoffs for a multiple unit installation is
recommended. Boiler gas manifold piping should be sized based on the volume requirements and lengths
between boilers and the fuel main header.
For installations with a mixed sized use, determine the flow of each unit and total the input. With the total
input, determine length of run from the source and determine what size header will be needed for the flow
of all units firing.
Figure 2-6 Gas header piping
Re g ulator
Header Pipe
Meter
Fr om
Gas Header Piping, Typical
Gas Strainer
Relief Valve
See Note 5
Manual Shut Off
See Note 1
NOTES:
1. Dedicated gas pressure regulator required for each boiler if gas supply greater than max. pressure in Table 1
2. Refer to local fuel gas codes when applicable.
3. Header to be sized for room capacity.
4. Provision required for measuring gas supply pressure at boiler.
5. Overpressure protection required if gas supply pressure > 5 psig.
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