I’m with Ben, the delivery time is what’s going to slam the door closed on going Dry without some deep thought.
Get Outlook for iOS<https://aka.ms/o0ukef> ________________________________ From: Jay Google <[email protected]> Sent: Thursday, April 3, 2025 6:59:58 AM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] Changing Antifreeze to Dry System Thanks for the responses. This group always helps with things you know, but haven't done for a while and refreshes our memories, especially old ones! Jay Stough Tustin Fire Solutions On Thursday, April 3, 2025 at 08:37:35 AM EDT, Ed Kramer <[email protected]> wrote: Jay, check out section 27.2.4.7.2 in NFPA 13 (2019). It might allow you to omit several sprinks in those small closets from the calc. Ed K Bamford Fire From: Jay Google <[email protected]> Sent: Thursday, April 3, 2025 6:26 AM To: Sprinkler Forum <[email protected]> Subject: [Sprinklerforum] Changing Antifreeze to Dry System 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
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