Chris, I agree is that is what the Code says. However, the 52000 is an arbitrary number and has no real impact on protection. For a couple of thousand square feet, I wouldn't have a big problem suggesting it. Probably 3k max.
Sent from my iPhone On Jan 2, 2012, at 12:46 PM, "Cahill, Christopher" <[email protected]> wrote: > As a former AHJ many requests, all denied with I agree it's silly but it's > the law. > > As a former contractor wanted to make such requests but never did because > it's not compliant with the law. > > As a current consultant would only make such request if specifically > instructed by the client over my clearly documented objections. (with the > hope the AHJ would back the law) > > And I don't think one can put a 52,000 sq.ft. aux dry system off a 52,000 > sq.ft. wet system as an example. The combined systems are still limited to > 52,000 sq.ft. So adding a control valve and flow switch at the additions off > the existing isn't going to help. > > As any role would suggest if you can easier cut off 6,000 sq.ft. near the > riser and turn that into its own system. Avoids the long run and then add > the new 6,000 to the end. > > Chris Cahill, PE* > Senior Fire Protection Engineer > Aviation & Facilities Group > Burns & McDonnell > P: 952.656.3652 > F: 952.229.2923 > [email protected] > www.burnsmcd.com > *Lic. in MN > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Bob > Sent: Monday, January 02, 2012 11:31 AM > To: [email protected] > Subject: RE: 52,000 square feet > > Greg, > I think that option two would be ok. It seems that it's ok to have an > auxiliary dry system off the end of a wet system, so an auxiliary wet system > should work as well. > > > > Bob Knight, CET III > 208-318-3057 > www.firebyknight.com > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Greg McGahan > Sent: Monday, January 02, 2012 10:04 AM > To: [email protected] > Subject: 52,000 square feet > > We have a school that is getting 2 small additions at the end of the wings of > approx. 6,000 and 3,000 sqft respectively. If we tried to tie on to the end > of one system to feed the larger addition, that system would be approximately > 56,000 sqft. Th other two options (I guess) would be to run 250' of 3" back > to the main riser and create a new system for this addition, or use it for > both additions with another 300' or so of main, or maybe to put in a new > control valve and flow switch at each addition to supply them. > I am not sure if the second option would meet the intent of the code and I am > too confused to figure this out this early in the year. > > The other addition appears to be on a system that is already about 53,000 > sqft and adding the addition would also put it around the 56,000 mark. > > Has anybody ever asked for a variance on something like this? It honestly > doesn't make any sense to put it in a separate system (other than to meet > code) because the operation of the system will not actually be effected. > Especially in the way these systems are shaped, there are several different > fire rated zones of much smaller area. > > Happy New Year and thanks, > > -- > Greg McGahan > Living Water Fire Protection, LLC <http://www.livingwaterfp.com> > 1160 McKenzie Road > Cantonment, FL 32533 > 850-937-1850 > fax 850-937-1852 > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachment > s/20120102/1eb1176e/attachment.html> > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.1901 / Virus Database: 2109/4718 - Release Date: 01/02/12 > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
