Jeremy, The 50'-0" pipe rule only applies if the Backflow Preventer has butterfly valves attached. If you are using OS&Y valves, then 4.27.3 applies regarding the 10 pipe diameters.
Sincerely Daniel S. Failla Jr. Assistant Fire Marshal Charleston Fire Department Fire Marshal Division Preservation Through Prevention Office - 843 - 724 - 5960 Email: [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jeremy Frazier Sent: Wednesday, October 02, 2013 11:52 AM To: [email protected] Subject: NFPA 20 (2010) 4.27.3.1 BFp to be installed 50' from the fire pump suction flange (as measured along the route of the pipe). Is this a typo? What it the reasoning for having such a long run of pipe without valves? In a small fire pump room with a bfp, It would seem you would have to do a bunch of zig zags with the pipe just to meet this requirement. Jeremy Frazier Designer Cavalier Fire Protection P:571-931-1004 F:571-931-1010 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
