I don't believe it was the intent to apply the requirement to the
possible build-up of pressure from surges but to the actual available
supply. The definition in 3.3.19 does state exclusive of surges.
Combined with the new expansion of requiring a relief valve on all wet
pipe systems instead of just gridded systems (7.1.2.1 2010 ed), says
to me that it's the characteristics of the water supply that drive
the requirement.
Roland
On Jan 20, 2011, at 11:20 AM, Sam Kassab wrote:
The pressure relief seems like the best option in this case.
Thanks for the feedback.
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
[email protected]
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Chris
Cahill
Sent: Thursday, January 20, 2011 11:12 AM
To: [email protected]
Subject: Re: Hangers and pressure surges
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]
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