You are correct for the working pressures of the components. You can usually find system components rated for higher pressures, except for dry sprinklers. However, for your standpipe design, don't forget:
NFPA 14:7.2.3.2 Where the static pressure at a hose connection exceeds 175 psi (12.1 bar), an approved pressure-regulating device shall be provided to limit static and residual pressures at the outlet of the hose connection to 100 psi (6.9 bar) for 1 1/2 in. (40 mm) hose connections available for trained personnel use and 175 psi (12.1 bar) for other hose connections. Duane Johnson, PE Program Manager Division of the Fire Marshal (Support Contractor) Office of Research Services National Institutes of Health 301-496-0487 "Protecting Science - One Sprinkler at a Time" -----Original Message----- From: Rod DiBona [mailto:[email protected]] Sent: Wednesday, May 16, 2012 10:19 PM To: [email protected] Subject: RE: 175 psi Yeah that is what it looks like. Just had it in my head that if we put more than 175 on the system that I was into prv's for the sprinkler and that doesn't seem to be the case. Apparently one of those things that I had cemented in my mind as fact until challenged. Thanks! -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Sprinkler Academy - C Bilbo Sent: Wednesday, May 16, 2012 8:12 PM To: FORUM Subject: RE: 175 psi Everyting we use except sprinkers are rated for more than 175psi...... And even the sprinklers are put through more than 300psi as they come off of the manufacturing line.... Do you have a question about a specific porduct? It should be recognized that the above is my opinion as a member of the NFPA, and has not been processed as a formal interpretation in accordance with the NFPA Regulations Governing Committee Projects and should therefore not be considered, nor relied upon, as the official position of the the NFPA, nor any of their technical committees. Sincerely, Cecil Bilbo Academy of Fire Sprinkler Technology Champaign, IL 217.607.0325 www.sprinkleracademy.com [email protected] OUR STUDENTS SAVE LIVES!! > From: [email protected] > To: [email protected] > Subject: 175 psi > Date: Thu, 17 May 2012 01:04:28 +0000 > > Had an old thought challenged and I think I have learned something. Situation: > > High rise building with a fire pump. Churn plus static to provide 100 psi > (discharge side of most demanding hose valve) on combined standpipe creates > just over 200 psi on bottom floor. Instantly I think to use pressure > regulating valve for the lower systems, feed lower systems before pump boost > or run a secondary standpipe. Another estimator tells me that most sprinkler > components are rated for well over 175. I didn't believe it but looking at > several products from several manufacturers seems to prove him right. There > were a few exceptions such as some sprinkler heads and hose valves but for > the pipe, fittings, valves etc there was no problem. If the project was FM it > would be tougher as most of the standard 5.6 heads were 250 UL but 175 FM. > > NFPA 13 2007 6.1.3 System components shall be rated for the maximum system > working pressure to which they are exposed but shall not be rated at less > than 175 psi for components installed above ground..." > > Am I missing something here or does over pressurization of the lower floor > only require pressure reducing hose valves and not system prv's as long as > the components are rated for more than the "... maximum system working > pressure to which they are exposed..." which seems to be the case for the > vast majority of components. > > > > [Description: LOGO_10] > Rod DiBona > Vice President > Rapid Fire Protection > office : (605)348-2342 > fax : (605)348-0108 > cell : (605)391-3553 > www.rapidfireinc.com<http://www.rapidfireinc.com> > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120517/8f1261f3/attachment.html> > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: image001.jpg > Type: image/jpeg > Size: 6561 bytes > Desc: image001.jpg > URL: > <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120517/8f1261f3/attachment.jpg> > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120516/226da935/attachment.html> _______________________________________________ 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
