IBC SL 20-160 G3 - Gas Pipe Sizing and Lengths

Figure 42 Basic primary-secondary piping with hydraulic separator - piping concept
3.11.2.2 Parallel load piping
Compared with the primary-secondary approach, the design below saves one pump. Lost is the
simplicity of constant head and flow at the boiler.
Air handler
Figure 43 One pump parallel piping concept
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3.11.2 System piping