FM data sheet 3-00 clause 2.1.2.2.3.2 may help - it is for number of sprinklers/pressure format. It is based on the actual spacings
Nicky Marshall Southern Regional Manager PROTECH DESIGN LIMITED Specialist Fire Protection Consultants Phone: +64 (0)3 579 5577 Mobile: +64 (0)21 433 488 Email: [email protected] Skype: nicky-marshall Web:www.protechdesign.co.nz Address:105A Alabama Rd, Redwoodtown, Blenheim 7201, NZ Postal: PO Box 4022, Redwood Village, Blenheim 7242, NZ -----Original Message----- From: Travis Mack, SET [mailto:[email protected]] Sent: Wednesday, 14 October 2015 5:10 a.m. 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
