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
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