This is the closest you're going to find, but its only for multi-story buildings, technically. 2025 edition
16.10.4.8 Where drain connections for floor control valves are tied into a common drain riser, the drain riser shall be one pipe size larger downstream of each size drain connection tying into it. Benjamin Young On Mon, Feb 23, 2026 at 7:57 AM Tim Easter <[email protected]> wrote: > Is this allowed?. If not what code section requires the drain manifold > connection piping to be increased? > > On Mon, Feb 23, 2026, 6:13 AM Tim Easter <[email protected]> wrote: > >> This is for a manifold. if multiple inlets of a certain size exist, the >> common header must be upsized. In other words, you can’t run multiple 2 >> inches into a 2 inch line. seeking the code that says that. >> >> Inlets into manifold. Not manifold into inlets. >> >> Thanks >> >> On Sat, Feb 21, 2026, 11:35 AM Patrick Tomaszewski < >> [email protected]> wrote: >> >>> Hmm this is interesting, not sure I am aware of this. >>> >>> More context would help. >>> >>> If you have multiple risers being fed on a manifold from a common water >>> supply, and they are all hydraulically calculated and proven with whatever >>> size, then why should it matter? >>> >>> >>> >>> Maybe this is for automatic sprinkler/standpipe fire department >>> connection? I could see a certain number of snoots requiring a minimum FDC >>> pipe size for sure. >>> >>> >>> >>> What specifically are you working on? >>> >>> >>> >>> [image: signature_2544299208] >>> >>> Patrick tomaszewski | *Estimator* >>> >>> www.valiantfireco.com <http://www.valiantfireco.comorg> >>> >>> [email protected] <[email protected]> >>> >>> 📍3910 Howe rd. Wayne, MI 48184 >>> <https://www.google.com/maps/search/3910+Howe+rd.+Wayne,+MI+48184?entry=gmail&source=g> >>> >>> >>> *“Every Second Matters.” * >>> >>> IG <https://www.instagram.com/valiantsec.mi/> • FB >>> <https://www.facebook.com/valiantsec.mi> • LINKED IN >>> <https://www.linkedin.com/company/valiant-security-llc> >>> >>> >>> >>> >>> >>> *From:* [email protected] <[email protected]> >>> *Sent:* Friday, February 20, 2026 6:18 PM >>> *To:* [email protected] >>> *Subject:* [Sprinklerforum] Inlet to manifold size >>> >>> >>> >>> What is the code section dealing with concept of manifold piping and >>> sizes. if multiple inlets of a certain size exist, the common header must >>> be upsized. In other words, you can’t run the is the multiple 2 inches into >>> a 2 inch line. seeking the code that says that. >>> >>> _________________________________________________________ >>> SprinklerForum mailing list: >>> >>> https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org >>> To unsubscribe send an email to >>> [email protected] >> >> > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to > [email protected]
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