So very well put Ken. One of the many advantages touted by the
manufacturers and contractors alike is the layout flexibility that flexible
sprinkler fittings provide. I have found that when using even 6 feet
lengths, there is extremely limited flexibility provided for moving heads
for wall and room changes. So, using 2 and 3 feet lengths will, in all
practical senses, not provide the flexibility to move heads at all. Looks
to me like that the chief advantages of flexible sprinkler fittings is that
they are simply less expensive, in regard to labor, and can provide center
of tile layouts.
Otherwise, they could have more friction loss than hard piped systems thus
increasing main sizes in some situations.
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]>
Sent by: cc
sprinklerforum-bo
un...@firesprinkl Subject
er.org RE: Flex Head Friction loss
11/12/2009 10:16
AM
Please respond to
sprinklerfo...@fi
resprinkler.org
Yep,
Number of bends with FM used to be a bigger factor than it is now. I
believe
it may have something with a newer test standard, but was limited to one
bend per if memory serves correct. I believe for most it is 3 now.
However, if a contractor is watching their pennies (which in this day and
age.....) then they we'll keep the lengths as short as possible. The price
difference between a 24" and 60" is huge when you multiply it times the
number of heads. Pretty difficult to get three compliant bends from a 24"
flex drop.
If you intend to use different lengths on a job you better make darn sure
that each area specifies what you intended to your field personnel. If a
60"
flexible drop is installed where a 24" should have been....it could really
throw a wrench in the works. Just one in the wrong place can upset the
hydraulic apple cart. Especially if used in OH1 or OH2.
QC be da key!
Ken Holsopple
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
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