By the letter, yes the AHJ is correct. The section states "Static or Flowing..." No, I have never had the issue come up.
Would a small relief valve set @ 99 psi be ok? R/ Matt Ps do not forget the hanger closest to the sprinkler shall be of a type to prevent upward movement... Matthew J. Willis, CET Automatic Fire Sprinklers Norred Fire Systems L.L.C. 318-387-1134 Voice 318-816-1087 Mobile 318-387-1163 Facsimile [email protected] > >-----Original Message----- > >From: [email protected] [mailto:sprinklerforum- > >[email protected]] On Behalf Of Sam Kassab > >Sent: Thursday, January 20, 2011 12:47 PM > >To: [email protected] > >Subject: Hangers and pressure surges > > > >NFPA requires hangers to be installed on armovers over 12" when operating > >pressure is over 100 PSI. What if normal street pressure is below 100 > >PSI > >and pressure surges cause a build-up of 100 PSI or more on the system > >side > >of the check valve? The AHJ's argument is that the system will have over > >100 PSI when the system first operates, albeit for a brief moment. Is > >the > >AHJ correct in his interpretation of this requirement? Has anyone ever > >come > >across this question? > > > > > > > >Thanks in advance. > > > > > > > >Sam Kassab > > > >TridenT FIRE PROTECTION, INC. > > > >13631 Pawnee Rd. , Suite A-1 > > > >Apple Valley, CA 92308 > > > >Tel : (760) 961-7222 > > > >Fax : (866) 501-5942 > > > >Cell: (805) 801-4676 > > > >Lic. C-16 935502 > > > > <mailto:[email protected]> [email protected] > > > > > > > >_______________________________________________ > >Sprinklerforum mailing list > >[email protected] > >http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > > >For Technical Assistance, send an email to: [email protected] > > > >To Unsubscribe, send an email to:[email protected] > >(Put the word unsubscribe in the subject field) > > > >No virus found in this incoming message. > >Checked by AVG - www.avg.com > >Version: 9.0.872 / Virus Database: 271.1.1/3375 - Release Date: 01/19/11 > >13:34:00 _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
