Sam,
The wording in NFPA 13 is when the "Maximum Pressure exceeding 100PSI". You
need to account for accumulated surge pressure in the system.
Maybe the installation of a pressure relief valve on the system riser would
take care of that problem for you.
Regards,
G. Tim Stone
G. Tim Stone Consulting, LLC
NICET Level III Engineering Technician
Fire Protection Sprinkler Design
and Consulting Services
117 Old Stage Rd. - Essex Jct., VT. 05452
TEL: (802) 434-2968 Fax: (802) 434-4343
[email protected]
> -----Original Message-----
> From: [email protected] [mailto:sprinklerforum-
> [email protected]] On Behalf Of Sam Kassab
> Sent: Thursday, January 20, 2011 1:47 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]
>
>
>
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