Yes..that is exactly it. The area of the remote area is the driving factor.
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
On 10/13/2015 9:49 AM, Cliff Whitfield wrote:
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
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