If the dry system is protecting dwelling units you need to meet 15 seconds for water delivery time.
Benjamin Young On Thu, Apr 3, 2025 at 7:26 AM Jay Google <jaycs7...@gmail.com> wrote: > We have a customer that wants to change the existing antifreeze to a dry > system. All the sprinklers on the system are pendents on drops. It is a > pipe schedule system. I think the best way to do this is keep the existing > piping, change the sprinklers and verify the pipe is pitched correctly to > drain as required or add low point drains if needed. This way the > sprinklers line up with existing holes from the attic. The building is an > independent living building (light hazard/residential). My questions are > 1) does the system need to be calculated since it's a pipe schedule and 2) > If so, can we use the room design method on a dry system? We are on the > 2019 edition of NFPA 13. I did not see anything in chapter 19 on using > room design for dry systems and don't recall ever seeing that. With that > in mind, if we calculate the 1950 sq. ft., there are a lot of closets > included in that that kill the calculations. > The building was built in 1999, of course no drawings and the pipe looks > as good as new inside and out. > > *Jay Stough* > > *Tustin Fire Solutions * > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to > sprinklerforum-le...@lists.firesprinkler.org
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