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yassinemzili (Civil/Environmental) (OP)
1 Jun 11 13:52
I have a simple question. For example if I'm in the case of designing automatic sprinkler for storage and work with the table 12.2.2.2.1(a)NFPA13(ed 2002) how can I detemine the shape of the design area and number of prinklers in each branch lines?

My suggestion is to apply 14.4.4.1.1 NFPA13(ed 2002) and calculat the number of sprinkler in branch lines by this formula:
1.2*sqrt(design area)/(distance between sprinklers in the same branch)
am I right?
sac32079 (Mechanical)
1 Jun 11 15:13
is this a ESFR calc?
sac32079 (Mechanical)
1 Jun 11 15:13
*an*
yassinemzili (Civil/Environmental) (OP)
1 Jun 11 15:36
no it's a standard spray sprinkler  
TravisMack (Mechanical)
1 Jun 11 16:36
I was taught that the # of sprinklers method is only good if everything is uniform.  You must always meet the length requirements.  So, if you have a 2000 sq ft design area, the length along the branch line shall be a minimum of 1.2(2000^.5) or 53.67'.

Travis Mack
MFP Design, LLC
www.mfpdesign.com
 

SuperiorFire (Mechanical)
1 Jun 11 16:56
Have a look in the Annex of the NFPA #13

Figure A.22.4.4 should point you in the right direction.

Like Travis says, though, you might have to calculate 'extra' heads if heads are spaced non-uniform.  

Superior Fire Protection Systems
Protectiong Lives and Property since 1986.

Vancouver, British Columbia
http://www.superiorfireprotection.ca

yassinemzili (Civil/Environmental) (OP)
1 Jun 11 18:02
In the case of large drop and ESFR sprinkler system disigned for storage table 14.3.1(a)and 14.4.1 from NFPA13 (ed 2007), how can I find the design area ?
I look in the NFPA 13 and didn't find the design area for tha case.
 
SuperiorFire (Mechanical)
1 Jun 11 18:24
14.4.3

Assuming your system is a grid, you will calculate 4 sprinklers on each of 3 branch lines, for a total of 12 sprinklers. The shape will thus be a rectangle.

 

Superior Fire Protection Systems
Protectiong Lives and Property since 1986.

Vancouver, British Columbia
http://www.superiorfireprotection.ca

SuperiorFire (Mechanical)
1 Jun 11 18:29
Also read 22.4.4.3 in NFPA 13. This should be pretty definitive for you.

Superior Fire Protection Systems
Protectiong Lives and Property since 1986.

Vancouver, British Columbia
http://www.superiorfireprotection.ca

yassinemzili (Civil/Environmental) (OP)
1 Jun 11 18:39
So if i understant what's in the 22.4.4.3 NFPA13, the design area should be at least 960sqft
SuperiorFire (Mechanical)
1 Jun 11 18:56
And at least 12 Sprinklers. Unless superseded by another line of code. What is the storage application?  

Superior Fire Protection Systems
Protectiong Lives and Property since 1986.

Vancouver, British Columbia
http://www.superiorfireprotection.ca

yassinemzili (Civil/Environmental) (OP)
2 Jun 11 2:53
it's to stor wood furniturs( chairs,cupboard,desk...) but I don't know how are they stored

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