Cecil, Thanks for the input, I had figured all that out after asking the question. The seventies and eighties were really, really bad to me. As one song from that day said, "My momma try to talk to me she try to tell me how to live, but I don't listen because my head is like a sieve". Like I said, really bad. LOL. Anyway I do appreciate the help.
Thank you, Bob Knight, CET III 208-318-3057 www.firebyknight.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Sprinkler Academy - C Bilbo Sent: Wednesday, February 12, 2014 6:43 PM To: [email protected] Subject: RE: Small Pre-action System Hi Bob, You need 7 psi as a minimum (gauge pressure, dude...) on Double- and Non-Interlock systems. (you are counting on the sprinkler activation before the valve will operate, thus minimum 7 psi on the head itself...) You have to supervise the piping on systems more than 20 sprinklers. Supervisory air is sometimes only ounces, but as you may already see, that would only be on a single interlock system. Hope this is helpful info. 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: Small Pre-action System > Date: Wed, 12 Feb 2014 16:50:36 -0700 > > It's been years since I have designed a small (3 sprinklers) single > interlock pre-action system. I have a vague remembrance of not > needing an air supply for a system this small, but I can find that > info anywhere. I'm wondering if I'm confusing it with the requirement > for supervision on systems over 20 sprinklers? Or, is this where the > 7 psi limitation comes in? Atmospheric pressure is something like > 14.7 psi so the 7 psi limit is meet? > > Dazed and confused in Idaho, > > Thank you, > > Bob Knight, CET III > 208-318-3057 > www.firebyknight.com > > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.org _______________________________________________ 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
