George, The way I do this is to average the lengths between heads. For example, you have a branch line with 6 heads. They are spaced 8', 12', 9', 11', 7', & 10' apart. The average will be 9.5' applying the 1.2 rule (assuming 1500 sf) you will have 4.89 (round up to 5) heads per line. If you use the greatest distance of 12' you end up with only 3.87 (round up to 4) heads per line. If you chose to use the least dimension of 7' you will end up with 6.63 (round up to 7) heads per line. 7 seems like to many and 4 looks like not enough. This is why I average the distance between heads in a case such as yours.
Bob Knight, CET 1660 Hill Rd Melba, Idaho 83641 (208) 318-3057 (208) 495-2057 fax b...@firebyknight.com www.firebyknight.com -----Original Message----- From: sprinklerforum-boun...@firesprinkler.org [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of George Medina Jr Sent: Tuesday, April 20, 2010 12:41 AM To: SprinklerFORUM@firesprinkler.org Subject: Calc Area If I am calculating a tree type system using the area/design method, and have several different lengths between sprinklers on a branch line. Would I use the longest length to determine the amount of sprinklers on a branch line. I have always used an average (which I've probably been wrong all these years). 1.2vdesign area S S= Distance between sprinklers on branch line 1.2vdesign area S S= Distance between sprinklers on branch line George Medina Jr. No virus found in this outgoing message. Checked by AVG - www.avg.com Version: 9.0.801 / Virus Database: 271.1.1/2820 - Release Date: 04/19/10 00:31:00 _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: supp...@firesprinkler.org To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org (Put the word unsubscribe in the subject field)
