Add some dried sludge and age 20 years. Mark, did u see the clogged drops on a DIPreAction sys up your way? I realize we need to maintain and cure bad ones with testing, but reality testing should include aging and normal degradation of system.
Sent from my iPhone On May 21, 2013, at 4:28 PM, "Cahill, Christopher" <ccah...@burnsmcd.com> wrote: > You are confusing velocity with vector. Same head at 50 psi doesn't go much > farther. > > Go grab a head and take a match to it. The link surely clears. The cap if > upright stays. If pendant gravity takes care of it. Then you can see how > little it takes to clear the cap. > > Why 7 psi? Why 52,000 sq.ft.? Why 1-12" The list is far too long. > > Chris Cahill, PE* > Senior Fire Protection Engineer, Aviation & Facilities Group > Burns & McDonnell > 8201 Norman Center Drive > Bloomington, MN 55437 > Phone: 952.656.3652 > Fax: 952.229.2923 > ccah...@burnsmcd.com > www.burnsmcd.com > > Proud to be one of FORTUNE's 100 Best Companies to Work For > *Registered in: MN > > > > > -----Original Message----- > From: sprinklerforum-boun...@lists.firesprinkler.org > [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Brad > Casterline > Sent: Tuesday, May 21, 2013 8:54 AM > To: sprinklerforum@lists.firesprinkler.org > Subject: RE: calc procedure logic > > 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 _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
