Bob,
Have you tried call the suppliers. Most of them have in house engineering
staff to assist in questions like yours.
Regards,
G. Tim Stone
G. Tim Stone Consulting, LLC
NICET Level III Engineering Technician
Fire Protection Sprinkler Design
and Consulting Services
117 Old Stage Rd. - Essex Jct., VT. 05452
CELL: (802) 373-0638 TEL: (802) 434-2968 Fax: (802) 434-4343
[email protected]
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Bob
> Sent: Wednesday, February 26, 2014 3:23 PM
> To: [email protected]
> Subject: RE: AFFF Bladder Tank Sizing
>
> It is foam/water in an H3 occupancy. Storage height is two pallet loads
> high up to 8' high. The entire system is under 2500 sf. The flammable
> liquids are class III b and class II stored in nonrelieving type
> containers.
>
>
> Thank you,
>
> Bob Knight, CET III
> 208-318-3057
> www.firebyknight.com
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of
> [email protected]
> Sent: Wednesday, February 26, 2014 1:03 PM
> To: [email protected]
> Subject: RE: AFFF Bladder Tank Sizing
>
> If that what was on the engineered drawings so be it.
>
> Is it foam-water sprinkler or low exp foam for a dike or ????????????????
>
> What kind of hazard and building configuration are you dealing with if I
> may ask?
>
> Craig L. Prahl, CET
> Fire Protection Group Lead
> CH2MHILL
> Lockwood Greene
> 1500 International Drive
> Spartanburg, SC 29303
> Direct - 864.599.4102
> Fax - 864.599.8439
> CH2MHILL Extension 74102
> [email protected]
>
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Bob
> Sent: Wednesday, February 26, 2014 2:57 PM
> To: [email protected]
> Subject: RE: AFFF Bladder Tank Sizing
>
> Design is based off of an analysis by a PE, so I assume he got the
> densities right. There was no info on tank sizing so I'm tackling that.
> Thanks for all the info it is very helpful.
>
>
> Thank you,
>
> Bob Knight, CET III
> 208-318-3057
> www.firebyknight.com
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of
> [email protected]
> Sent: Wednesday, February 26, 2014 12:43 PM
> To: [email protected]
> Subject: RE: AFFF Bladder Tank Sizing
>
> So I'm assuming you've verified that AFFF and not AR-AFFF is the suitable
> solution and that 3% not 6% or other is also suitable? Typically unless
> you have some cookbook material you're dealing with, make a call to one of
> the foam reps and run the material by them to verify type of concentrate,
> concentration, and flow rates. 0.30 gpm/sf is pretty high for a
foam-water
> system unless you've got some extenuating circumstances going on.
>
> 10 minutes is standard baseline for NFPA 16. But it can vary depending on
> conditions and Underwriter.
>
> You didn't state the type of foam system so the assumption here is
> something like a foam-water sprinkler system.
>
> Foam Concentrate Tank sizing:
> Density x design area x 1.15 = GPM x % concentration x duration = tank
> size.
> 0.30 gpm/sf x 2500 sf x overage or imbalance factor = 862.5 GPM x 3%
> concentration x 15 minute duration= 388 gallons. Use a 400 gallon tank.
>
> Imbalance or overage fact is typically in the 10-15% range since sprinkler
> system do not actually flow at 100% of design criteria. Mathematically
.30
> x 3000 = 900 gpm but if you look at your calcs you'll see when it's all
> said and done calculated flow will be more and ACTUAL flow will always
> exceed design.
>
> There are other factors to consider again depending on the specific hazard
> and type of foam system you are designing.
>
>
>
> Craig L. Prahl, CET
> Fire Protection Group Lead
> CH2MHILL
> Lockwood Greene
> 1500 International Drive
> Spartanburg, SC 29303
> Direct - 864.599.4102
> Fax - 864.599.8439
> CH2MHILL Extension 74102
> [email protected]
>
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Bob
> Sent: Wednesday, February 26, 2014 1:58 PM
> To: [email protected]
> Subject: AFFF Bladder Tank Sizing
>
> I have a NFPA 30 project where I need to size a bladder tank for 3% AFFF
> solution. I have looked but can't find any info on sizing the tank. I am
> assuming that I need to take the gpm flowing x .03 x 15 min duration. The
> only thing I have found for a safety factor in in 409 where it uses 1.15.
> For example, 750 gpm x .03 = 22.5 x 15 = 337.5 x 1.15 = 388.125 gal. Does
> this sound right?
>
>
> Thank you,
>
> Bob Knight, CET III
> 208-318-3057
> www.firebyknight.com
>
>
>
>
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