Sloped Nonfixed Obstruction at Platform
Sloped Nonfixed Obstruction at Platform
(OP)
I am looking at a situation where I have a performance "platform" (NOT a stage) with sound deflectors that will be moveable in the vertical plane. The deflectors constructed so as to be at 2 angles, 12 degrees and 32 degrees, with no means of retaining heat from a fire.
htt p://files. engineerin g.com/getf ile.aspx?f older=9dbb 21c3-6b12- 434b-8bfc- 59db1280a3 60&fil e=Platform _FP_workin g_file_Mod el_(1).pdf shows a section through the deflectors.
In plan view the deflectors are approx 7'6"x7'6".
Is it worth trying to get sprinklers into the deflectors per NFPA 13 8.6.5.3? 8.6.5.3.3 would seem to allow me not to have them in the deflectors since the deflectors are not "fixed".
I am open to suggestions for protecting under the defelctors.
Thanks in advance.
Bill McDonald, PE
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In plan view the deflectors are approx 7'6"x7'6".
Is it worth trying to get sprinklers into the deflectors per NFPA 13 8.6.5.3? 8.6.5.3.3 would seem to allow me not to have them in the deflectors since the deflectors are not "fixed".
I am open to suggestions for protecting under the defelctors.
Thanks in advance.
Bill McDonald, PE





RE: Sloped Nonfixed Obstruction at Platform
add addtional lines at the deck level to possibly get distrbution depending on the angle of the panels??
a head between the panels??? at panel level
extended coverage heads???
seems like you need something
RE: Sloped Nonfixed Obstruction at Platform
Heads between panels is something I am keeping in my back pocket; they would require a pre-action system and possibly other controls to "reset" the deflectors to their high point in the event of a fire.
RE: Sloped Nonfixed Obstruction at Platform
could you put a little structural projection to act as a heat collector, not wild about it but somethin as you would find in a laundry chute.
why do you need the pre action if you put them between the panels???
RE: Sloped Nonfixed Obstruction at Platform
RE: Sloped Nonfixed Obstruction at Platform
The Pre-action system would be needed for sprinklers between the panels for the same reason I need a draft-stop or heat collector. Heat/smoke detectors at the primary ceiling would activate the pre-action sprinklers.
Would there be any code issues with protecting the platform like a stage (this is not a stage) with a standpipe system and hose valves at the platform level?
RE: Sloped Nonfixed Obstruction at Platform
I guess my idea was to put sprinkler heads between the panels, at even to the bottom of them. and if they are in some other position the ceiling heads would activate and cover between the panels.
do not see a need for pre action and even with pre action you have to have the heat, at the head, to activate the head.
RE: Sloped Nonfixed Obstruction at Platform
You are right about needing heat for preaction, my thoughts were more along the lines of a deluge type system.
Thanks for the feedback.
Bill
RE: Sloped Nonfixed Obstruction at Platform
interesting problem
can they seperate the panels enough to allow the the ceilings to protect them
or require say beam detectors below the panels to alert that there is a problem???
or tie the panel conteols in so in case of any fire alarm that they move to a certain postion and the head is in a loction to catch the heat????
RE: Sloped Nonfixed Obstruction at Platform
Regardless of the spacing between the panels, they are still big enough to be obstructions.
I am not familiar with "beam detectors". How would these work?
Using the controls to move the panels to a "fire alart position" could work.......locate sprinklers between panels, then need way to entrain heat to avoid use of deluge sprinklers.
RE: Sloped Nonfixed Obstruction at Platform
Suggest consulting with and FPE on this
Normaly beams are used to cover a large area, like an atrium or other large open areas instead of using smoke detectors, which would take more, and if fifty feet in the air may not work , and also yearly testing is a problem.
beam shoot a beam to a reciever and if obscrued by a per cenatage of say smoke they activate the alarm.
you can but them at various levels as needed.
http:
http://www.systemsensor.com/pdf/A05-0095.pdf
sounds like if you can pull the panels up upon fire alarma activation and provide protection below, would be the best bet. You are relying on mechanical means to make the system work, and also yearly inspections to assure it continues to work.