Dear Allan and all other contributing experts, Sorry that I was out of city for a while, and I believe Allan's sharing is mostly resemble to our current situation. Please pardon my English and in case I didn't get it, do you (Allan) mean there is "no" sprinkler (and not even the sprinkler head) sticking out, and not even showing on the concave surface of the dome. (i.e. the audience will not see any part of the sprinkler from their seat as those sprinklers are all hided between the dome and the actual ceiling)
I am asking as this is the first design of this kind in Macau and we are trying to verify and confirm if all sprinklers hided above the dome is a legal and possible design!? Thank you experts, George Lau --- On Wed, 9/10/08, Allan Seidel <[EMAIL PROTECTED]> wrote: > 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. > > > > > > > > > > _______________________________________________ > > Sprinklerforum mailing list > > > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: > [EMAIL PROTECTED] > > > > To Unsubscribe, send an email > to:[EMAIL PROTECTED]<[EMAIL PROTECTED]> > > (Put the word unsubscribe in the subject field) > > > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: > [EMAIL PROTECTED] > > To Unsubscribe, send an email > to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [EMAIL PROTECTED] To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
