I think they can be different without a wall or lintel. Example 4 heads in a square room. Heads 8' off the wall on 3 sides and 9' off on the 4th side. Heads 16' apart. The two heads nearest the 9' off the wall are 18' x 18' and the other two heads are 16' x 16'. I don't think this is a usual scenario but certainly legal. Can even be more complicated if the room were 28' wide and 46' long. Heads 7' off the wall on 3 sides and 9' off on the 4th side. 16' between the first two head in the 46' direction and 14' for the next two heads. Now you have 18', 16', and 14' in the same room. You probably only do this due to aesthetics and something preventing you from spacing between heads at 16'. Simple s x l application is all that required.
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] www.burnsmcd.com Proud to be one of FORTUNE's 100 Best Companies to Work For *Registered in: MN -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ron Greenman Sent: Friday, June 01, 2012 12:43 PM To: [email protected] Subject: Re: E/C heads: Different coverages, same area. I don't think so if your design basis is 18x18 and the small (I'm seeing a dog leg off the living room for the kitchen) compartment directly communicates with the larger no matter how small the smaller compartment is. 18x18 rules throughout. Now if it's a separate compartment, with at least the lintel, then that rule wouldn't necessarily apply. On Fri, Jun 1, 2012 at 9:11 AM, George Church <[email protected]> wrote: > Ohhh, couldn't the heads be 8' from each other if 8' is the min spacing? > > > George L. Church, Jr., CET > Rowe Sprinkler Systems, Inc. > PO Box 407, Middleburg, PA 17842 > 877-324-ROWE 570-837-6335 fax > [email protected] > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Ron > Greenman > Sent: Thursday, May 31, 2012 7:08 PM > To: [email protected] > Subject: Re: E/C heads: Different coverages, same area. > > You can space them at anything you want up to and not less than the > maximum/minimum spacing you're calculating for. Since minimum is 1/2 S > 18x18 can't exceed 18' between heads, nor more than 9' from the wall, nor be > closer than 9' feet to an adjacent head. just make sure the kitchen head is > nine feet from the adjacent living room head(s) and it's an 18x18 too. > > On Thu, May 31, 2012 at 3:33 PM, Ralphy Henderson <[email protected]> > wrote: >> Is it permissable to space residential heads at two different areas of >> coverages in the same compartment? Case: a living room making use of 18x18 >> spacing while the kitchen next to it (without a lintel or anything) is >> spaced at 16x16. This is a 13 system (not 13R) and when calculating I'm >> wondering if I can calc them according to this method. I know the larger >> demand will end up driving the calculations - just want to make sure with >> this... >> >> Thanks,RB >> -------------- next part -------------- An HTML attachment was >> scrubbed... >> URL: >> <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/att >> a chments/20120531/28e51b9d/attachment.html> >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > > > -- > Ron Greenman > Instructor > Fire Protection Engineering Technology Bates Technical College > 1101 So. Yakima Ave. > Tacoma, WA 98405 > > [email protected] > > http://www.bates.ctc.edu/fireprotection/ > > 253.680.7346 > 253.576.9700 (cell) > > Member: > ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC > > They are happy men whose natures sort with their vocations. -Francis > Bacon, essayist, philosopher, and statesman (1561-1626) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
