Where did these 'requirements' come from? It sounds to me that the
owner needs to have an Engineer come in and work with him (or her) on
a system design.
I believe that with the anti-freeze that it could still be a 13R
system. A dry system would push it to 13. The water company would
probably have something to say about glycerine (remember, no glycol
in CPVC) in underground mains. Since the existing system is dry and
(I assume) a 13, is there going to be an issue decreasing the
protection level to 13R? The AHJ or Insurance Comapny may weigh in on that.
Without knowing the type and arrangement of the building, It's
difficult to make any comments about the impact of the soffits. I'm
not sure I follow Ron's train of thought.
Since you spoke about outside walkways, is part of this system
outside? If so, then galvanized pipe and fittings plus wax coated
sprinklers on a dry system would be appropriate.
At 09:43 PM 7/3/2007, you wrote:
Hello sprinklerforum,
I am open to suggestions on this one.
We have a customer in a 4 story residential building
wanting to replace the entire system due to rusted/leaking pipes in
the old system.
They are requiring the system to be installed with CPVC piping.
They are requiring the ENTIRE system to be filled with
Anti-Freeze including the underground.
They are wanting to put the DCDA Backflow, Then the Alarm
Valve, Then the RPZ Backflow and Expansion Tank into a hotbox outside.
To me it looks like the use of Anti-Freeze bumps it to a 13
system instead of 13R. The new piping is to be built into new
soffits on the outside of the building walkways. They have a Dry
Pipe system now and do not want the leaking problems they have now
to recur in a few years like the existing 10 year old system. I am
not even bring up the subject of Anti-Freeze recovery/reuse when
the system is tested or when the Alarm company does a flow to test
the WF switches quarterly. The Main Drain flow test is another subject...
--
Best regards,
Charles Thurston
Coastal Fire Protection mailto:[EMAIL PROTECTED]
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
860-535-2080
www.fpdc.com
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