I believe you are determining the area correctly. The specific code text is below.
This is from the 2013 edition 8.5.2.1.1 The protection area of coverage per sprinkler (As) shall be determined as follows: (1) Along branch lines as follows: (a) Determine distance between sprinklers (or to wall or obstruction in the case of the end sprinkler on the branch line) upstream and downstream (b) Choose the larger of either twice the distance to the wall or the distance to the next sprinkler (c) Define dimension as S (2) Between branch lines as follows: (a) Determine perpendicular distance to the sprinkler on the adjacent branch line (or to a wall or obstruction in the case of the last branch line) on each side of the branch line on which the subject sprinkler is positioned (b) Choose the larger of either twice the distance to the wall or obstruction or the distance to the next sprinkler (c) Define dimension as L 8.5.2.1.2 The protection area of coverage of the sprinkler shall be established by multiplying the S dimension by the L dimension, as follows: A S L s = B.J. Newlin Service Sales Aegis Fire Protection LLC. "Whoever is careless with the truth in small matters cannot be trusted with important matters" ― Albert Einstein -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Spencer Allen Sent: Friday, February 27, 2015 10:52 AM To: [email protected] Subject: Fire area head spacing Hi, I am hoping some could point out the NFPA clause that states how the sprinkler area is measured? I was taught when I first started that it was largest distance to the next sprinkler (S) x branchline (D), or double the distance to the boundary if larger. i.e heads spaced branchlines space at 10' but last branchline was 6' off the wall we would use 12' spacing. Best Regards, Spencer Allen M: +44 (0)7876 545 306 E: [email protected] _______________________________________________ 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
