You can have a single inlet FDC on risers smaller than 4". A 2" underground is not going to supply much more than a residential system and wouldn't do it if you have a attic dry system.
Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com 860-535-2080 (ofc) > On Dec 3, 2014, at 10:19 AM, Brian Harris <[email protected]> wrote: > > Todd- > What's your take on the FDC coming off the Riser & the 2" underground? > > Brian Harris, CET > BVS Systems Inc. > bvssytemsinc.com > > > -----Original Message----- > From: Sprinklerforum [mailto:[email protected]] > On Behalf Of Todd - Work > Sent: Wednesday, December 03, 2014 9:58 AM > To: [email protected] > Subject: Re: Riser Size > > I have always sized them by hydraulic calculation (or pipe schedule). No > minimums. > > Todd G Williams, PE > Fire Protection Design/Consulting > Stonington, CT > www.fpdc.com > 860-535-2080 (ofc) > >> On Dec 3, 2014, at 9:43 AM, Brian Harris <[email protected]> wrote: >> >> I can't seem to put my finger on it this morning but is there a minimum size >> requirement for the Riser in a 13 system? I know there is for the FDC >> connection and the underground main to the building but I don't see anything >> the limits the size of the Riser except the hydraulic calculations. In this >> particular job the FDC is located on the Riser so I assume the Riser would >> at least have to be 4" up to the FDC connection. Currently the civil drawing >> is show a 2" supply to the building from a 6" underground main.... >> >> Brian Harris, CET >> BVS Systems Inc. >> Sprinkler Division >> bvssystemsinc.com<http://bvssystemsinc.com/> >> Phone: 704.896.9989 >> Fax: 704.896.1935 >> >> _______________________________________________ >> 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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
