Nicely spelled out for many but it depends on how you define IS. We added to the Annex that modifications include extending a NEW area of the building with a new PORTION for the existing system. If the system area were exceeded so that it required an individual system riser then the bigger K factor would be required. As such, most would interpret modifying for new contest to fall within this arena.
As a side point smaller area of coverage is also mediocre protection for high density challenges. That extra row of in-racks is a big step forward. Roland Huggins, PE - VP Engineering American Fire Sprinkler Assn. --- Fire Sprinklers Saves Lives Dallas, TX http://www.firesprinkler.org <http://www.firesprinkler.org/> > On Oct 8, 2015, at 2:06 PM, James Crawford <[email protected]> wrote: > > Thanks Roland > > Existing heads are spaced at 72 sq.ft. so end head pressure is 33.5 psi, but > we are also looking at adding one more row of in-racks to reduce the ceiling > demand to 0.30/2000 to further reduce the end head pressure. > > If there are grey areas we normally discuss with the AHJ, but I thought it > was spelled out nicely in NFPA #13. > > Thank you > > > James Crawford > Phaser Fire Protection Ltd. > Phone 604-888-0318 > Fax 604-888-4732 > Cel 604-790-0938 > Email [email protected] > > > -----Original Message----- > From: Sprinklerforum [mailto:[email protected]] > On Behalf Of Roland Huggins > Sent: Thursday, October 08, 2015 1:24 PM > To: [email protected] > Subject: Re: Existing sprinklers > > The 65 psi end head pressure is a bitter pill but NFPA 13 allows them to be > retained for modifications to existing systems. That clause is part of the > current standard so bringing the system up to current standards does not > exclude it’s application. Mediocre fire protection at best but allowed. A > discussion with the AHJ at the BEGINNING beats a fight after the fact since > interpretation enters the fray. > > Roland > > > Roland Huggins, PE - VP Engineering > American Fire Sprinkler Assn. --- Fire Sprinklers Saves Lives > Dallas, TX > http://www.firesprinkler.org <http://www.firesprinkler.org/> > > > > > >> On Oct 2, 2015, at 12:41 PM, James Crawford <[email protected]> wrote: >> >> This is a sprinkler system that was designed to have in-rack sprinklers >> installed at a future date if required, and for this tenant we were planning >> on installing two levels of in-racks with a ceiling density of 0.45, this is >> what is currently in this building. >> >> I see no need to change the roof system heads if they work. >> >> >> >> Thank you >> >> >> James Crawford > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
