Greg,
I haven't seen any other replies to this so I thought I would offer my
little bit of knowledge on this.I once designed an office retro-fit with
cpvc,the hangers in some vacant areas were about 10' (this was the lower
floors with a lot of space above the proposed ceilings.The same
condition occured with too much flexibility so we ended up treating it
like it was in an earthquake zone,but used some core area walls,etc. to
brace the system (also columns).Once this was done everyone felt a
little better about it.
What I learned was,sometimes it is not the best idea to use cpvc in an
installation like this because it ended up costing more than if we had
used steel pipe,especially in these areas.Good luck with this!
Lamar Vaughn,SET
On Fri, Jul 15, 2011 at 12:33 PM, Greg McGahan wrote:
I was just asked a question by a local AHJ....there is a light hazard
bldg
with cpvc pipe hung using ATR 15-17' long. When the pressure was
relieved
the system moved so much they are afraid it is not stable enough to
operate
properly if a head activated.
I know the requirement for vertical restraint near the sprinkler
heads, but
what if the pipe system is so flexible that there is enough lateral
movement
to allow the heads to pop up above the ceiling?
Thanks,
Greg
--
Greg McGahan
Living Water Fire Protection, LLC <http://www.livingwaterfp.com>
1160 McKenzie Road
Cantonment, FL 32533
850-937-1850
fax 850-937-1852
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