My intention is to connect a 1-1/2" T to the domestic line and put a riser, complete with backflow, for each system. That would be required with an FDC. I would go along with the three 13D systems, but I don't think the AHJ is going to buy into that. Besides, this will more than likely end up in front of the MA Sprinkler Review Board and I don't want to (and am not getting paid to) get into that fight.
Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com On Apr 18, 2013, at 10:23 AM, "Steve Leyton" <[email protected]> wrote: > Ummm ... I don't think that's the intent of a 13R design. Sounds more > like three 13D or IRC systems in a row. And I think you have a > plumbing code issue: you can't have an FDC that's backfed to each of > three systems that are in turn connected to domestic water unless you > limit your inlet pressure to 80psi and/or put a BFP on each of the > sprinkler connections. Dude, just say no to this set up. > > The foregoing is my opinion only and does not necessarily represent the > opinion or intent of the NFPA 13D/13R Technical Committee on Residential > Sprinkler Systems. > > Steve Leyton > Protection Design & Consulting > San Diego, CA > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > Todd - Work > Sent: Thursday, April 18, 2013 7:14 AM > To: [email protected] > Subject: 13R FDC with multiple risers > > I am designed a 13R system to be retrofitted into a 3 family house (all > 3 units are 1st floor only). Each unit has an 1-1/2" feed for domestic > water, to which the sprinkler risers will be connected. I will end up > with 3 risers, one for each unit. Any thoughts on how to handle the FDC? > A pit on the line with a check and free standing FDC is impractical. > Individual FDCs seem like overkill. There is no real way to interconnect > the systems due to building configuration. > > Todd G Williams, PE > Fire Protection Design/Consulting > Stonington, CT > www.fpdc.com > _______________________________________________ > 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
