What about the threaded CI or DI fittings. Aren't they class 125 or 150?
On 5/16/2012 9:12 PM, Sprinkler Academy - C Bilbo wrote:
Everyting we use except sprinkers are rated for more than 175psi......
And even the sprinklers are put through more than 300psi as they come off of
the manufacturing line....
Do you have a question about a specific porduct?
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: 175 psi
Date: Thu, 17 May 2012 01:04:28 +0000
Had an old thought challenged and I think I have learned something. Situation:
High rise building with a fire pump. Churn plus static to provide 100 psi
(discharge side of most demanding hose valve) on combined standpipe creates
just over 200 psi on bottom floor. Instantly I think to use pressure regulating
valve for the lower systems, feed lower systems before pump boost or run a
secondary standpipe. Another estimator tells me that most sprinkler components
are rated for well over 175. I didn't believe it but looking at several
products from several manufacturers seems to prove him right. There were a few
exceptions such as some sprinkler heads and hose valves but for the pipe,
fittings, valves etc there was no problem. If the project was FM it would be
tougher as most of the standard 5.6 heads were 250 UL but 175 FM.
NFPA 13 2007 6.1.3 System components shall be rated for the maximum system working
pressure to which they are exposed but shall not be rated at less than 175 psi for
components installed above ground..."
Am I missing something here or does over pressurization of the lower floor only require
pressure reducing hose valves and not system prv's as long as the components are rated
for more than the "... maximum system working pressure to which they are
exposed..." which seems to be the case for the vast majority of components.
[Description: LOGO_10]
Rod DiBona
Vice President
Rapid Fire Protection
office : (605)348-2342
fax : (605)348-0108
cell : (605)391-3553
www.rapidfireinc.com<http://www.rapidfireinc.com>
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