Yup, you got it.  For example if you look at Figure 12.3.2.1.2(g) if you used 
Curve "A" with an 8ft aisle at .39/2000 and Curve "C" with a 4ft aisle at 
.475/2000, a 6ft aisle would give you a density of 0.4325/2000.  

And I would hold that density tightly to that 0.4325, I wouldn't let any old 
contractor get away with only giving 0.43 when the spec says 0.4325 gpm/sq. ft. 
  Specs is specs! ;)


Craig L. Prahl, CET   
Fire Protection Specialist
Mechanical Department
CH2MHILL
Lockwood Greene
1500 International Drive
PO Box 491, Spartanburg, SC  29304-0491
Direct - 864.599.4102
Fax - 864.599.8439
[email protected]
http://www.ch2m.com 


-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of Jay White
Sent: Monday, June 29, 2009 3:33 PM
To: [email protected]
Subject: RE: In-rack fireprotection

I am guessing this is a point or density between the density at 4ft. and the 
density of 8ft. wide aisle?

Jay White
Estimator/Design Manager
Dynamic Fire Protection
1807 Hwy. 25 South
Starkville, MS 39759
Phone: 662-324-1550
Fax:       662-324-1545
Cell:      662-312-2426

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Jay White
Sent: Monday, June 29, 2009 2:30 PM
To: [email protected]
Subject: In-rack fireprotection

In NFPA 13 2002 edition, section 12.3.2.1.2.1; for aisle widths between 4ft and 
8 ft, a direct linear interpolation between densities shall be made. Can 
someone explain this?

Jay White
Estimator/Design Manager
Dynamic Fire Protection
1807 Hwy. 25 South
Starkville, MS 39759
Phone: 662-324-1550
Fax:       662-324-1545
Cell:      662-312-2426


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