I do not understand the intent of this section in the code? By following this procedure we are in effect increasing the density provided. Why?
Sent from my iPhone On Mar 13, 2013, at 8:50 PM, "Ed Kramer" <[email protected]> wrote: > Chris, the way I read 23.4.4.1.1.4 is that it's optional. In your case, I'd > calc 2,000 sf of dry system plus 1,900 sf of wet. Since it's all light > hazard, it shouldn't get ugly. > > I gotta believe there will be some tweaking to that section, though. I read > the ROP and ROC - Tracey's 480 sf canopy (page 88 of the ROC) is probably > being protected by 4 sprinklers, but could require a 4" supply pipe & dry > valve since the phantom flow is added at the end of the dry x-main. That > doesn't seem reasonable to me. > > Ed Kramer > Lawrence, KS > > > >> -----Original Message----- >> From: [email protected] [mailto:sprinklerforum- >> [email protected]] On Behalf Of Cahill, Christopher >> Sent: Wednesday, March 13, 2013 4:46 PM >> To: [email protected] >> Subject: Phantom Flow >> >> Not what you think by the subject. Working out of NFPA 13 '13 >> 23.4.4.1.1.5. This is new and confusing us greatly. >> >> I have a 20,000 sq.ft. heated LH building. And a 2,000 sq.ft. area that >> needs a dry system. Not an auxiliary dry system. My starting required >> design is 0.1/3,900. I calc the system at 2,000 sq.ft. (cuz that's all >> I have) and get for discussion sake 220 gpm. Then I subtract from 390 >> (3,900 x 0.1 per 23.4.4.1.1.5) and I get 170 gpm. Then I go back to the >> calc and redo but this time I add 170 at the end of the main. Now this >> has the effect of overflowing all the rest of the BL's such my final >> calc is more than 390. >> >> !@#$^# >> >> What if I have a 500 sq.ft. building and the next building is 20 miles >> away @#$@# are we calc'ing this extra area for? >> >> Can someone 'splain if we got it right and then why in the world this >> got into the standard? >> >> Chris Cahill, PE* >> Senior Fire Protection Engineer, Aviation & Facilities Group Burns & >> McDonnell >> 8201 Norman Center Drive >> Bloomington, MN 55437 >> Phone: 952.656.3652 >> Fax: 952.229.2923 >> [email protected]<mailto:[email protected]> >> www.burnsmcd.com<http://www.burnsmcd.com/> >> >> Proud to be one of FORTUNE's 100 Best Companies to Work For *Registered >> in: MN >> >> >> >> >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: >> <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attach >> ments/20130313/26a3e378/attachment.html> >> _______________________________________________ >> 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
