Original intent was to allow a section of pipe to verify the interface
between the antifreeze & water. Top valve should show mostly antifreeze
& the bottom show mostly water.
On 2/25/2016 11:01 AM, Zachary Siegrist wrote:
All,
I came across my first antifreeze system today in an existing application.
I know there is no current listing of antifreeze for use in new
applications which partially explains why I have never seen an antifreeze
system before. The install was consistent with the arrangement of supply
piping and valves section of NFPA 13. Seeing this for the first time lead
me to two questions:
1) why is the 5 foot drop required?
2) what purpose do valves "A" and "B" serve in the illustration in 7.6.3 of
the 2013 edition.
Could anyone chime in?
Zach Siegrist
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