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Drainage of single-valve auxiliary drains on a dry sprinkler system.

Question asked by Nathaniel Lee on Dec 13, 2017
Latest reply on Dec 17, 2017 by Kevin Rowe

Obviously, the NFPA 25 requirement to drain condensation from dry sprinkler system auxiliary drains before the onset of freezing conditions applies to any dual-valve "drum drip" drains on the system.  But does it also apply to single-valve auxiliary drains serving regions with less than 5 gallons of trapped piping?  Does it apply to an inspector's test drain containing a single valve?  

 

Does one expect an unsophisticated building owner to drain these single-valve drains when there is a potential to trip the dry-pipe valve in the process?

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