Craig,

You've moved out of the range of significant numbers, You can't have a
degree of precision in your results that is more precise than you
inputs. I'd let him have 0.433.

On Mon, Jun 29, 2009 at 12:57 PM, <[email protected]> wrote:
> 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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-- 
Ron Greenman
Instructor
Fire Protection Engineering
Bates Technical College
Tacoma, WA

Member:
SFPE, ASCET, NFPA, AFSA, NFSA AFAA
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