Ron, Lamar,
Thanks for the response and sharing your views.
I don't know exactly the purpose of the lower
panel, but there might be one or two possibilities:
- for thermal insulation by creating an air
cussion between the lower panel and the arched plastic top cover;
- to create a smoother and cleaner ceiling in
this food processing plant (edible oil).
The lower panel was probably not designed to drop out in case of a fire,
allthough it might in fact drop out. But even whithout the lower panel,
sprinklers inside are not allowed to be omitted
bij NFPA 13 - 2010 par. 8.5.7.1,
since these skylights are larger then 32 ft2 (3 m2).
Looking at it as a concealed space:
They might have invented non-combustible clear plastic,
but most plastic molecules I know of contain a lot of carbon and hydrogen.
I just wanted to make sure that I'm not interpreting the rules too strictly.
However, I think it is rightful to require a sprinkler in these skylights.
If a fire starts on the bitumineous roofing
material (by a roofer's accident or debris from a neighbouring fire),
there is nothing to stop it from descending into
the building, unless there is a sprinkler in the skylight.
Frans Stoop
TOS architecture & fire protection
Netherlands <[email protected]>
Tel. +31-24-324 0112
At 22:49 27-9-2010 -0400, you wrote:
Is it possible that one of the panels (the
lower,maybe) is designed as a "drop out"
panel?This may solve the issue.Then what is the purpose of the lower panel?
---- Ron Greenman <mailto:[email protected]>[email protected] wrote:
> Apparently no one liked this so I'll venture an OPINION. If one of the
> criteria for omitting sprinklers from a space is a non-combustible or
> limited combustible concealed space, and this area you've described is
> concealed (despite being able to see into it-transparency not being
> part of the definition for concealed in this context) then the
> question revolves around the combustibility of the plastic panels
> above and below. I doubt if there's a non-combustible plastic panel
> but there may be one that falls within the limited combustibility
> definition. Of course both conjectures are purely speculative.
> > On Mon, Sep 27, 2010 at 7:23 AM, Frans
Stoop <[email protected]> wrote:
> > My apologies: first message had wrong subject in header.
> >
> > Dear colleagues,
> >
> > A client has a truck loading building where tankers are filled with
> > combustible (edible) oil. The building is protected by a foam/water
> > sprinkler system according to NFPA 13 & 16.
> >
> > There are a few skylights, distributed over the roof of the building.
> > Spacing between the skylights exceeds 10 ft
(3 m). The area of each skylight
> > exceeds 32 ft2 (3 m²).
> > The skylights have plastic covers.
> > The bottom of each skylight is closed with
a transparant plastic panel that
> > flattens out the bottom of the skylight with the surrounding ceiling.
> > The plastic cover on top and the plastic
panel at the bottom create inside
> > the skylight a concealed space with a height of approx. 2 or 3 ft.
> >
> > The roof is covered with non-combustible
ceramic insulation (rockwool) and
> > bitumic sheeting on top of it.
> >
> > Question: are sprinklers required in these
skylights? What is your opinion?
> >
> >
> > Frans Stoop
> > TOS architecture & fire protection
> > Netherlands <mailto:[email protected]>[email protected]
> > Tel. +31-24-324 0112
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--
> Ron Greenman
> Instructor
> Fire Protection Engineering Technology
> Bates Technical College
> 1101 So. Yakima Ave.
> Tacoma, WA 98405
>
> <mailto:[email protected]>[email protected]
>
> http://www.bates.ctc.edu/fireprotection/
>
> 253.680.7346 > 253.576.9700 (cell)
>
> Member:
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