From: Allan Seidel <[EMAIL PROTECTED]>
Subject: Re: Help!! Sprinkler in Planetrium
To: [email protected]
Date: Wednesday, September 10, 2008, 8:46 AM
If you are going to install sprinklers then maybe this
information is of
help.
We recently prepared an in the dome wet design for the same
except that the
dome diameter was considerably smaller. First of all the
space above the
dome is noncombustible, so there were no sprinklers above
the dome. This is
an existing dome in a university setting. White flat
coverplates (already
fused) were shipped out to the owner with a layuut plan and
instructions to
try one to see if the coverplate caused any image problems.
We were told to
go ahead with the concept. The sprinkler layout is based
upon LH and is
using the actual distance along the dome curve to verfiy
that the layout did
not technically exceed NFPA 13 spacing rules. The dome
curve was also
checked to see if it is an obstruction to discharge. as it
turned out the
curve radius was tight enough to obstruct discharge for an
extended
coverage sprinkler. This may not be a problem for a 30 foot
radius but the
sprinkler would have to be a flat coverplate EC.
The space outside of the dome is painted out black. There
is considerable
light leakage through the perforated dome. I witnessed this
myself. The dome
actually appears as a lighted surface when viewed from its
backside. The
sprinkler will be installed with a black sheet metal shroud
covering the
sprinkler parts that are outside of the dome. This includes
the last fitting
to which the shroud will attach. The intent is to have
nothing that can
reflect light back into the dome. The piping will be
painted out black. Each
sprinkler will terminate at back to back 90s and sit at the
end of a
vertical drop. For this dome there are only four sprinklers
located near the
top of the dome. The project location is not in a seismic
area.
Allan Seidel
St. Louis, MO
On Tue, Sep 9, 2008 at 9:24 PM, George Lau
<[EMAIL PROTECTED]> wrote:
Dear Sprinkler Experts,
I am new to the forum. Besides a "Hi" to
yall, I am desperately seeking
suggestion or reference regarding the "Sprinkler
installation in a
PLANETARIUM" which possesses a (60ft dia)
semi-spherical dome screen (made
of white paint coated matellic plate with small
holes). Our current plan is
to keep all those sprinker heads above the dome
screen. Is it a workable
design?
Since we are lack of local technical reference, can
anyone throw me some
light regarding the normal practice, if the sprinkler
heads should be above
the dome screen. If yes, what other concerns/attention
should be paid?
Thank you so much,
George Lau
Macau S.A.R.
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