Maybe because the 14 committee knows there is no way to "supplement" the water supply. If the pressure and flow at the FDC is great enough to open the check valve it will close the riser check. While I don't agree with the 250 gpm for each inlet, 500 is more reasonable. 13 should drop "supplemental" altogether or replace it with something more realistic.
Ron Fletcher Aero Automatic Phoenix, AZ -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Dewayne Martinez Sent: Thursday, February 02, 2012 6:06 AM To: [email protected] Subject: RE: Standpipe FDC Inlets Why isn't the FDC supplying an automatic wet standpipe system considered supplemental as well then? The required demand for the standpipes are met by the sprinkler system but NFPA 14 still requires a 2 1/2" connection for every 250gpm demand? Dewayne -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Roland Huggins Sent: Wednesday, February 01, 2012 10:09 AM To: [email protected] Subject: Re: Standpipe FDC Inlets but the FDC on a sprinkler system is SUPPLEMENTAL and you don't have to meet the system demand. Since one has to also calc the system demand from the FDC, has anyone looked at the maximum flow they can get through a single 2-way FDC and still meet their design demand? Roland On Feb 1, 2012, at 7:52 AM, Steve Leyton wrote: > As do a few on the left side. It's common to see demand-based > requirements for both standpipe and sprinkler systems. How many > ESFR systems are out there with 2-way FDC's? If system demand is > 1,600gpm ... > > SL _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
