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? [signature_2544299208] Patrick tomaszewski | Estimator www.valiantfireco.com<http://www.valiantfireco.comorg> [email protected] <mailto:[email protected] > 📍3910 Howe rd. Wayne, MI 48184 “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.
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