If the EOR calls for a .18/2500 calcing the system at a .20 should be acceptable. But if you submitted a calc where you used 1500 sf instead of 2500 sf I'd reject it in a skinny minute. You can't just arbitrarily decide to use 1500 when you don't know what drove the 2500 sf requirement. The Code doesn't "require" a 1500 sf design area, that is the minimum. It is not uncommon to see design criteria that varies from NFPA 13, often it is driven by loss data and recommended or required by owner's risk consultants or Underwriters.
Craig L. Prahl, CET Fire Protection CH2MHILL Lockwood Greene 1500 International Drive Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 CH2MHILL Extension 74102 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jeff Garrison Sent: Thursday, October 20, 2011 5:41 PM To: [email protected] Subject: Re: Density Area Question Calc what Code/Listing requires: .20 / 1500, but produce an "Auxilliary" Calc at the .18/2500. Use the bigger pipe(s) of the two. You will probably have a BIG safety margin at the .2/1500 Jeff Garrison Detroit Automatic Sprinkler On Thu, Oct 20, 2011 at 1:46 PM, Brian Harris <[email protected]>wrote: > I'm having a brain cramp and could use some help. I'm working on a retail > store and the engineer has called for Tyco EC-11 heads with a .18/2500 > density. I realize the .18/2500 falls on the OH-2 curve but the cut sheet > for the head is rated at .20/1500 for OH-2. How would you go about > designing > to these specs? > > > > Brian Harris, CET > > First Defense Fire Protection > > 11957 Ramah Church Road > > Huntersville, NC 28078 > > Phone: 704.948.3506 > > Fax: 704.948.3507 > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111020/76690320/attachment.html > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111020/8ce9bd12/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
