Except that you are designing outside the standard. Can't recall ever even thinking of approaching an AHJ with 6 psi instead of 7.
Sent from my iPhone On May 21, 2013, at 9:58 AM, "Brad Casterline" <bcasterl...@fsc-inc.com> wrote: > Thanks John. Assuming that is true, we could say a 1/2" head at 7 psi throws > 7'-6" each way. At 7 psi the water hits the deflector going 32.26 ft/sec. > v=SQRT(2gh). At 6 psi it would be going 29.87 ft/sec, and would throw 6'-11" > each way. > > -----Original Message----- > From: John O'Connor [mailto:jocon...@nfspk.com] > Sent: Tuesday, May 21, 2013 8:37 AM > To: sprinklerforum@lists.firesprinkler.org > Subject: RE: calc procedure logic > > The 7.0 PSI end head minimum pressure was never intended to "kick out" the > links, seat etc, but to develop the minimum spray pattern required to > deliver the specified density. > John O'Connor > National Fire Sprinklers, Inc. > Nashville TN > > -----Original Message----- > From: sprinklerforum-boun...@lists.firesprinkler.org > [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of > mphe...@aerofire.com > Sent: Tuesday, May 21, 2013 8:31 AM > To: sprinklerforum@lists.firesprinkler.org > Subject: Re: calc procedure logic > > Wouldn't it depend on the application rate, area of protection and orifice > size? > Mark at Aero > > ----- Original Message ----- > From: Brad Casterline [mailto:bcasterl...@fsc-inc.com] > Sent: Tuesday, May 21, 2013 01:03 PM > To: sprinklerforum@lists.firesprinkler.org > <sprinklerforum@lists.firesprinkler.org> > Subject: calc procedure logic > > Would the 7 psi minimum operating pressure from NFPA 13 Calculation > Procedure apply to open head deluge, since the operating parts have already > been ejected clear of the frame and deflector by a ball-peen hammer? > > > > Brad Casterline, NICET IV > > Fire Protection Division > > > > FSC, Inc. > > P: 913-722-3473 > > bcasterl...@fsc-inc.com > > www.fsc-inc.com > > > > Engineering Solutions for the Built Environment > > > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1432 / Virus Database: 3162/5841 - Release Date: 05/20/13 > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
