I think you forgot to provide the key required to unlock using pipe schedule. How many Ft2? Over 5000?
And yes, pretty sure you can use Room Design on a Dry. Check out single line design towards the end of Chap 19. It applies to Dry without modifiers since you moved beyond D/A. R/ Matt Matthew J. Willis, C.E.T. Ferguson Fire Design, LLC D: (602) 337-0721<tel:6023370721> C: (307) 236-8249<tel:3072368249> [email protected]<mailto:[email protected]> ________________________________ From: Ben Young <[email protected]> Sent: Thursday, April 3, 2025 6:04 AM To: Jay Google <[email protected]>; Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] Re: Changing Antifreeze to Dry System Caution: This email originated from outside of the organization. DO NOT click links or open attachments unless you recognize and trust the sender. ________________________________ 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 <[email protected]<mailto:[email protected]>> 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<https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org> To unsubscribe send an email to [email protected]<mailto:[email protected]>
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