Note the tie-in drains are restricted to 25nb to stop the Dry Pipe tree system becoming a grid system.
Russell Gregory e-mail rcgreg...@snap.net.nz <mailto:rcgreg...@snap.net.nz> From: Jamie Seidl Sent: Thursday, February 1, 2024 3:32 PM To: Discussion list on issues relating to automatic fire sprinklers <sprinklerforum@lists.firesprinkler.org> Subject: [Sprinklerforum] Re: Dry System Drain Manifolds You can tie-in multiple low point drains on dry systems together. it's actually a "shall" for multiple branchlines. NFPA 13 2013 & 2016 8.16.2.5.3.6 Tie-in drains shall be provided for multiple adjacent trapped branch pipes and shall be only 1 in. (25 mm).Tie-in drain lines shall be pitched a minimum of 1⁄2 in. per 10 ft(4 mm/m). This section was moved to 16.10.5.3.6 in 2019. I don't see any reason you couldn't provide tie-in drains post drum drip either. Jamie Seidl On Wed, Jan 31, 2024 at 4:53 PM Taylor Schumacher <tay...@sfsprinkler.com <mailto:tay...@sfsprinkler.com> > wrote: I remember seeing something that says you cannot combine dry system drains together, but I cannot find it. FWIW, this would be post drum drips. Thanks, Taylor Schumacher _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org <mailto:sprinklerforum-le...@lists.firesprinkler.org>
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