The issue is most problematic when the head first pops. So I think the AHJ has a point. Oh and 9.2.3.4.4.1 seems to actually support the AHJ legally where it clearly says static or flowing.
Now if your real static without surge is below 100 you have the option of controlling surges instead or changing hangers as I would interpret. Chris -----Original Message----- From: "Sam Kassab" <[email protected]> Sender: [email protected] Date: Thu, 20 Jan 2011 10:46:49 To: <[email protected]> Reply-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) _______________________________________________ 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)
