Using NFPA 13 (2007 thus the reason for my question) I cannot find anything
saying that using a swing check valve at the end of a wet system and
transitioning to a glycol system is allowed. Basically 1 section of a parking
garage is exposed to cold temps when the garage door opens. Door failed to
shut and several freeze breaks happened. The question has been asked if adding
a separate control valve before a single check valve at the end of the wet
system and turning it into antifreeze (without a rpz or a loop) was an
option. I don't see where this is an option by 7.6 anywhere. I feel like I'm
missing something here. Are any of the older editions of 13 saying this is
allowed or am I looking in the wrong spot?
J. Blocker
EFPS
(303) 353-9712
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