See (5) below for pendent conditions without return bends on preaction systems otherwise see (3).
2013 ED. 7.3.2 Preaction Systems. 7.3.2.5 Sprinklers. The following sprinkler orientations and arrangements shall be permitted for preaction systems: (1) Upright sprinklers (2) Listed dry sprinklers (3) Pendent sprinklers and sidewall sprinklers installed on return bends, where the sprinklers, return bend, and branchline piping are in an area maintained at or above 40°F (4°C) (4) Horizontal sidewall sprinklers, installed so that water is not trapped (5) Pendent sprinklers and sidewall sprinklers, where the sprinklers and branch line piping are in an area maintained at or above 40°F (4°C), the water supply is potable, and the piping for the preaction system is copper or CPVC specifically listed for dry pipe applications Duane Johnson Strickland Fire Protection -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Travis Mack Sent: Monday, March 16, 2015 11:14 PM To: [email protected] Subject: Re: Pendent sprinklers on return bends on a pre-action system My understanding is pipe must still be pitched and return bends required. Travis Mack, SET MFP Design, LLC "Follow" us on Facebook: https://www.facebook.com/pages/MFP-Design-LLC/92218417692 Send large files to MFP Design via: https://www.hightail.com/u/MFPDesign Sent from my iPhone > On Mar 16, 2015, at 8:03 PM, Sean Lockyer <[email protected]> wrote: > > Even though (non-dry) pendent sprinklers must be installed on return bends on > dry systems what about pendent sprinklers in a heated/conditioned space that > is protected by a double-interlock, pre-action system (such as a video > production room, etc.) ? > > Does the fact that it is above a conditioned ceiling space matter ? To my > knowledge there is nothing in NFPA codes or the manufacturers listing that > give you an allowance for special situations like this but I was wondering if > anyone else has any experience with this sort of issue ? > > I would like to hear everybody's thoughts.. > > > Sean Lockyer > Project Designer 4617 Parkbreeze > Court > Cell 386-279-1197 Orlando, > Florida 32808 > [email protected] Phone: 407-816-9101 > www.AITLifeSafety.com Fax: > 407-816-9104 > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
