If no calcs were done how do you know you can’t run the 2” pipe to the 2” manifold. If the system was pipe schedule then your answer is in the pipe schedule located in NFPA.
Shawn Foor, SET *FOOR DESIGN, LLC* *4708 S. Sequoia Ave* *Broken Arrow, OK 74011* *P:918-237-1400* On Sat, Feb 21, 2026 at 10:37 Tim Easter <[email protected]> wrote: > That's issue no hydraulic calcs were done. > > 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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