noun: supplement; plural noun: supplements - something that completes or enhances something else when added to it.
How can the possibly pressure be supplemented? Using enough pressure to open the FDC check valve will close the valve in the riser. The rule should be changed to either calculated or just require a 4" 2-way FDC for everything. There are buildings in Phoenix with 12 - 2 1/2 " FDC inlets because of an old amendment requiring one 2.5" inlet for every 250 gpm system demand. The rule was changed when the FD figured out that a pumper truck only carried enough equipment to connect to four inlets. Ron F -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Tim Stone Sent: Tuesday, November 25, 2014 6:56 AM To: [email protected] Subject: RE: Contradiction if FDC codes? NFPA 13 2013 NFPA 13 is a minimum design /installation Standard, NOT A CODE. Fire department Pump Trucks are equipped with variable pressure pumps which enables the pump operator to increase extra boost when needed. I don't see any contradiction. Regards, G. Tim Stone G. Tim Stone Consulting, LLC NICET Level III Engineering Technician Fire Protection Sprinkler Design and Consulting Services 117 Old Stage Rd. - Essex Jct., VT. 05452 CELL: (802) 373-0638 TEL: (802) 434-2968 Fax: (802) 434-4343 [email protected] -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Cory Power Sent: Tuesday, November 25, 2014 8:39 AM To: [email protected] Subject: Contradiction if FDC codes? NFPA 13 2013 Could someone explain to me the intent behind this code and if the Annex is contradicting? 8.17.2* Fire Department Connections. 8.17.2.3* Size. The size of the pipe for the fire department connection shall be in accordance with one of the following: (3) For hydraulically calculated systems, the fire department connection shall be permitted to be less than 4 in. (100 mm) and no less than the size of system riser, where serving one system riser. A.8.17.2.3 The purpose of a fire department connection is to supplement the pressure to an automatic fire sprinkler system. It is not the intent to size the fire department connection piping based on system demand. For multiple system risers supplied by a manifold, the fire department connection need not be larger than that for an individual system. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
