Hanger attachments are being confused with bracing attachments. - NFPA 13 (2019) Section 18.5.11.10 explicitly DOES NOT allow C-clamps used for seismic bracing structural attachments with or without restraining straps unless specifically listed for such use. - Section 18.7.1 allows their use for hangers in seismically active areas when a restraining strap is included. - Chapter 17 explicitly DOES allow listed use of c-clamps for hangers alone.
See commentary for further discussion and pictures depicting their allowed hanger usage. Hope this helps, Ryan L. Hinson, PE*, SET** \ Burns & McDonnell Senior Fire Protection Engineer O 952-656-3662 \ M 763-688-4045 \ F 952-229-2923 rhin...@burnsmcd.com \ burnsmcd.com 8201 Norman Center Drive, Suite 500 \ Minneapolis-St. Paul, MN 55437 *Registered in: LA, MD, MN, PA, TX, & UT **NICET IV - Water-Based Systems Layout -----Original Message----- From: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org> On Behalf Of Jerry Van Kolken via Sprinklerforum Sent: Wednesday, August 26, 2020 12:52 PM To: sprinklerforum@lists.firesprinkler.org Cc: jvankol...@mfpc.us Subject: C-Clamp Hangers Does anyone know the reasoning Why you would not be allowed to use C-Clamps for your hanger attachments? I've had a couple of specs have this requirement pass by my desk recently. Jerry Van Kolken Millennium Fire Protection Corp. 2950 San Luis Rey Rd. Oceanside, CA 92058 (760) 722-2722 FX 722-2730 _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org https://nam05.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.firesprinkler.org%2Flistinfo.cgi%2Fsprinklerforum-firesprinkler.org&data=02%7C01%7Crhinson%40burnsmcd.com%7C1d14008726f74fa34d4308d849e89359%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C0%7C637340610543326549&sdata=%2Bt0YUDv8iKf9xPab8hEUmLbdCBOX%2FIZ5VDKB7jaeLls%3D&reserved=0 _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
