Well said Ken. Don't forget that the flexible lines are limited to the
number of bends as well as their radius.
Thank You
Rahe Loftin, P.E.
Region 7 - GSA
Office - 817-978-7299
Fax - 817-978-8644
Cell - 817-371-3102
"Ken Holsopple
\(forum\)" To
<[email protected]> <[email protected]>
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un...@firesprinkl Subject
er.org Flex Head Friction loss
11/12/2009 06:56
AM
Please respond to
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resprinkler.org
Folks,
If you use the FM friction losses then when the FM rep comes out the bends
have to be of the proper radius. If you use the FM criteria without an FM
rep. involved it is still the same. By the way.....either way you need to
make sure you are using the right model flexible drop. Braided vs.
unbraided, proper length installed etc....
The thing to avoid mostly is using the UL criteria on an FM job without
talking to the FM rep first. If he/she inspects the job and you have a
bunch
of 3" bends and unbraided flex drops.....someone is gonna have some
splainin' to do. (To the best of my knowledge FM hasn't approved any of the
unbraided models)
Dan - Excellent tip with the coffee can. Was that plastic or aluminum? Will
be checking Maxwell House and Target brand to see if we can add to the
list.
:)
One more thing for you designer folks...
Make sure your field personnel know exactly what they can and can't do.
Doesn't matter what you calc if the flexible drops are installed with kinks
in it. If you are running your piping 1'-0" above the ceiling directly
above
the ceiling tile you intend to drop in and you expect the fitter to drop
without exceeding the bend radius limit....you're out of your tree. Simple
details on prints go a long way......
This is no different than using CPVC piping or any other specialty piece of
equipment. If you are gonna use it you have to follow the rules. And the
makes and models aren't interchangeable.
Ken Holsopple
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