Thanks for the responses. Neither one of these approaches would be
my first choice. I now know where the Architect got the idea that
sidewalls at the dome base and sprinklers also above the dome is an
"accepted" solution! I can see the deluge as remotely possible, if
the detection can work and the system never goes false, except that
there is no easy way to get back up to the outside surface of the
dome for detector maintenance. Sounds like a job for Protecto-wire
maybe? I am in favor of a simple wet system using four flat white
Viking Mirages at about 2 o'clock high (2 feet to 3 feet below the
dome top). The dome radius is too tight for three ECs to work. This
is an existing planetarium, so a fused cover plate (hot coffee works
well to release a plate) has been sent with placement instructions
for the client to see if it really does anything to their projected
image. I hope it will be tolerable.
Thanks again,
Allan Seidel
St. Louis, MO
On Jan 8, 2008, at 11:12 AM, Russell wrote:
Yep, sure was. Can't remember the exact size but something like a 30'
diameter. Being on the deluge system, the sprinklers were open so
ceiling
was no consideration. The sidewalls were the only sprinklers on the
deluge
system. The system above the dome was wet. The detectors were above
and
attached to the dome skin. I don't recall what sort of detector's
they were.
Just for curiosity, I'll try to run it down, but it's been a long,
long time
and the mind is weak.
Ron
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Tuesday, January 08, 2008 10:53 AM
To: sprinklerforum@firesprinkler.org
Subject: RE: Planetarium ceilings
Deluge system? Really? Was that to protect against those simulated
flaming meteors?
How big was the room to allow sidewalls? How did they install them in
regards to mfgr and NFPA guidelines requiring max of 4-6 inches below
ceilings?
Was the deluge system above the dome and detectors above the dome?
Craig L. Prahl, CET
Fire Protection Group
Mechanical Department
CH2MHILL
Lockwood Greene
1500 International Drive
PO Box 491, Spartanburg, SC 29304-0491
Direct - 864.599.4102
Fax - 864.599.8439
[EMAIL PROTECTED]
http://www.lg.com
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Russell
Sent: Tuesday, January 08, 2008 10:37 AM
To: sprinklerforum@firesprinkler.org
Subject: RE: Planetarium ceilings
I have been involved with this situation once. The engineer of record
designed sidewall sprinklers 7'-0" A.F.F. 10'-0" max. spacing along
the
perimeter connected to a deluge system with detectors mounted at the
domed portion on the outside of the dome. Don't remember what kind of
detector he used to accomplish this. A wet pipe system was used at the
roof deck throughout the area above the planetarium. All steel
construction.
Ron
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of << 0
o 0
Sent: Tuesday, January 08, 2008 8:18 AM
To: sprinklerforum@firesprinkler.org
Subject: RE: Planetarium ceilings
Many moons ago I did one for Denison University, the EOR wanted
vertical
sidewalls around the perimeter of the dome. No heads in the
planetarium
ceiling. Not sure if that came from the manufacture of the dome,
GC, EOR
or the University. I don't remmber for sure but we may have had heads
above the dome too.
Bryan A. Dann
Dannba Design Services, LLC
Fire Sprinkler Designs
Office: (740) 363-5878
Cell: (740) 803-0967
[EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Allan
Seidel
Sent: Monday, January 07, 2008 10:53 PM
To: sprinklerforum@firesprinkler.org
Subject: Planetarium ceilings
If I may tap into the sprinklerforum's years of experience, what is
the
typical practice for a planetarium ceiling? The planetarium in
question
has a domed metal ceiling of about 25 feet in diameter. The ceiling
material is essentially the same as that of a 12 x 24 metal pan
ceiling
with tiny holes, except that the pans are curved pie sections. The
projector sits at the center and therefore projects normal to the
dome's
inner surface. It seems to me that three small diameter Viking flat
concealed sprinklers would probably have a negligible, if
noticeable at
all, impact on the projected image. I doubt there would be any shadow
because the image arrives normal to the surface. Has anyone done
one of
these?
Thanks,
Allan Seidel
St. Louis, MO
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