>From my viewpoint. We do not use 1.5 inch hose any more common around us is 1.75 to get more water on fire quicker. Norm On Feb 19, 2014 8:51 AM, "Brad Casterline" <[email protected]> wrote:
> Does anyone know why the technical committee settled on 100 PSI minimum at > the 2.5" hose valve? > > It used to be 75 PSI, and for High Rise retrofit I have seen AHJs accept > 75. > > I am just curious because I think with about 60 PSI at the 2.5" connection > to the standpipe we could get about 250 GPM at the nozzle, figuring the Pf > for the T, 2.5x0-6 nip, hose valve, and 100 feet of 2.5" hose. > > A 15 psi safety factor seems reasonable, but 40 psi??? > > I know the F.D. might want to use a 2.5x1.5 reducer and 1.5" hose, but with > 150 GPM flowing through 100 feet of 1.5" hose the Pf in the hose alone is > about 162 PSI! > > So, I don't get it, but I am likely missing some simple explanation, so I'm > asking. > > > > thanks, > > > > > > Brad Casterline, NICET IV > > Fire Protection Division > > > > FSC, Inc. > > P: 913-722-3473 > > [email protected] > > www.fsc-inc.com > > > > Engineering Solutions for the Built Environment > > > > _______________________________________________ > 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
