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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