NFPA 13 2022 28.2.4.9 and subsections governs use of differing sprinklers in one area, it does not seem like the initial prohibition on mixing Ks for balancing would apply to your situation especially based on the follow up language. One concern though would be over discharge caused by the demand of the extended coverage head vs the standard coverage head. If you’re using a larger orifice extended coverage where the pressure is low it may not be an issue, but if you’re using a small high pressure extended coverage head it may drive the demand of the non extended coverage heads way up anyway. Incorrect head replacement would be the other issue. Often you see ½ standard coverage and ¾ extended mixed which typically mitigates most of the over discharge concern and limits the possibility of a head mix up if replacement is required and/or at install time.
Mike Morey CFPS 3229 • NICET S.E.T. 123677 Project Estimator • Fire Protection Group Shambaugh & Son, LP an EMCOR Company 7614 Opportunity Drive • Fort Wayne, IN • 46825 direct 260.487.7824 / cell 260.417.0625 / fax 260.487.7991 email [email protected]<mailto:[email protected]> [cid:[email protected]] From: Joshua Taylor <[email protected]> Sent: Thursday, June 6, 2024 9:37 AM To: [email protected] Subject: [Sprinklerforum] Allowed to mix extended coverage & standard spray coverage? Importance: High All, Is there anything in the code preventing the installation of extended coverage and standard spray coverage heads of the same style (i. e. semi-rec. style) in the same area? Assuming there is code issue, what are thoughts on taking this ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message originated outside your organization. ZjQcmQRYFpfptBannerEnd All, Is there anything in the code preventing the installation of extended coverage and standard spray coverage heads of the same style (i.e. semi-rec. style) in the same area? Assuming there is code issue, what are thoughts on taking this route? Thank you [Fire Protection Service] Joshua Taylor : Fire Sprinkler Designer 4132 Dumont Street #4 Cincinnati, OH 45226 www.dornfireportection.com<https://urldefense.com/v3/__http:/www.dornfireportection.com__;!!FaxH778!YE84EQtF2EvkSr1bumCuM1TnvjdxxFA3GybNUdkEIsgVzXF2ZZ9TKDqYu3-g4ydjUBWMw2za60dx-shOTUflEg$> This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient.
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