The question is - what is your 'total sq footage' based on? The sq footage of the actual sprinkler spacing (1120 sf) or of the spacing based on 14 x 14 coverage per head (1568)?
Cliff -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of James Crawford Sent: Tuesday, October 13, 2015 10:44 AM To: [email protected] Subject: RE: Tyco EC-25 CMSA requirements See NFPA #13 2013 ed section 16.2.2.3 in the handbook give a good explanation on this and it would be 4x4. The square root of your total square footage time 1.2 divided by the distance between the heads. 47.41 divided by 13.42 = 3.54 or 4 heads Trust this helps Thank you James Crawford Phaser Fire Protection Ltd. Phone 604-888-0318 Fax 604-888-4732 Cel 604-790-0938 Email [email protected] -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Travis Mack, SET Sent: Tuesday, October 13, 2015 9:10 AM To: [email protected] Subject: Tyco EC-25 CMSA requirements When using the EC-25 as a CMSA sprinkler (current spacing 10-5 X 13-5), the criteria for our application is 8 sprinklers at 40 psi. When calculating, do you calculate 4+4 or do you do 3+3+2? Tyco's data sheet does not give guidance, nor does NFPA 13, Chap 21. I've been told use 1.2 * Sqrt (area). But is that the area based on max coverage of 14x14 (8*196 = 1568) or do you use area per sprinkler (140*8 = 1120). The difference is that at 1568, my length down remote area is 48' which requires 4x2. The 1120 is 40. This is a weird configuration, so my heads are spaced at 13-5 on center. As such, that puts me at 3 sprinklers per line. In this particular project, much of the piping is existing, and the difference is 17 psi between the 4+4 and 3+3+2. That difference requires removing existing 6" piping and replacing with existing 8" piping. Does anyone have any guidance on this? My gut is that it is 4+4. My customer is saying it is 3+3+2. -- Travis Mack, SET MFP Design, LLC 2508 E Lodgepole Drive Gilbert, AZ 85298 480-505-9271 fax: 866-430-6107 email:[email protected] http://www.mfpdesign.com https://www.facebook.com/pages/MFP-Design-LLC/92218417692 Send large files to us via: https://www.hightail.com/u/MFPDesign _______________________________________________ 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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
