George is practicing skating on some mighty thin ice. The problem
would be that it isn't an existing system until AFTER it is accepted.
This requirement has been in the standard a long time so whatever the
basis, it is lost as ancient history. A reasonable assumption (since
it is allowed for existing systems, thus must still work) is that the
1/2 NPT unnecessary restricts the flexibility of a system that
already has a higher flow demand than typically provided by K 5.6.
Roland
On Apr 25, 2007, at 9:38 AM, George Church wrote:
I wouldn't see the harm in asking.
You could also go inand install the k5.6 heads, re-run the calcs,
and then
retro the 1/2 K8 heads in accordance with the code into what is now an
"existing" system.
glc
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Greg
McGahan
Sent: Wednesday, April 25, 2007 12:20 PM
To: [email protected]
Subject: 1/2" thread - 8 K sprinklers
NFPA 13 clearly states that we can not use 8.0 k heads with 1/2"
threads in
new installations. I assume there are reasons for this but I do not
know
them.
BUT, we have a new job with pipe on the floor and 1/2" welded
outlets for
5.6 k sprinklers. The problem is we ran into some lights and are
having to
move some pipe which blows our calcs. (Our designer made a mistake
and did
not realize that the lights are not hanging, but are mounted to the
purlins.)
We had in excess of 10% cushion and now we have -5%. If we use the
8K heads
we are fine.
The other option is to reorder all of the branchline piping 1 size
larger.
We reflowed the hydrants to confirm the water and lost 10 psi
residual to
make matters worse.
Does anyone on the committee have any input before I ask the AHJ to
consider
this change?
Greg
Living Water Fire Protection, LLC
1160 McKenzie Road
Cantonment, FL 32533
850-937-1850
Fax: 850-937-1852
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