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+Minimum foam concentrate application rates.,,(Application rates are listed as gpm
.10 for flammable liquid spill/fire
.16 for tank diameter of less than 150
.18 for tank diameter of less than 200
.20 for tank diameter of less than 250
.20 Polar solvent spill/fire
Polar Solvent = EthanolJ%ZZZ#
RequirementsrBased upon the 75 x 40 spill footprint one can see that 270 gallons of 3% foam concentrate would be needed.
If we assume every gallon of 3% foam concentrate requires 97 gallons of water, we can see that we would also need 26,190 gallons of water (97 x 270) to maintain the required 15-minute application period.:Z:PreplanLBased upon the previous example:
Where would you get 270-gallons of 3% AR-AFFF concentrate?
Where would you get 26,190-gallons of water in an area without hydrant s?"
NFPA 11 states that a minimum15-minute flow duration is required.
If you calculate this minimum requirement in all of your foam concentrate requirements this should get you off to a good start.
Do not hesitate to calculate more if there is a large spill or fire.
Gasohol (not E-95 or E-85) fires may be extinguished using conventional AFFF and AR-AFFF but increased application rates may be necessary especially for prolonged burn back resistance.NP@ 0` 33` Sf3f` 33g` f` www3PP` ZXdbmo` \ғ3y`Ӣ` 3f3ff` 3f3FKf` hk]wwwfܹ` ff>>\`Y{ff` R>&- {p_/̴>?" dd@,|?" dd@ " @ ` n?" dd@ @@``PR @ ` `p>>$(
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IApplication Rates
Described in Terms of the Amount in Gallons of Foam Solution Reaching the Total Square Footage of the Fuel Surface Every Minute
Critical Application Rate - lowest rate at which a foam will extinguish a fire under a particular set of ideal conditions (.06 for gasoline)
Minimum application rate - the amount found by tests to be the most practical in terms of speed and control of agent required~$seH
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Application Rates
Foam concentrate application rates may be as low as 0.06 gpm for gasoline to as much as 0.20 for polar solvents (ethanol).,{${H
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8Application Rates Calculated
Determine Area of Hazard
Choose Appropriate Application Rate
Rate x Area = GPM of Foam Solution
Solution GPM x % Used = Concentrate GPM
Concentrate GPM x Time = Total Concentrate
" Storage Tanks - 60 Minute Flow Time
" Spills - 15 Minutes Flow TimeTxxFx$FfH
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EApplication Rates Calculated
Example
Determine Area of Hazard = 3000 sq. ft
Application Rate = 0.20 GPM
Rate x Area + 600 GPM of Solution
600 GPM x 3% Used = 18 GPM Concentrate
18 x 15 minutes application time = 270 gals needed8%$$X2
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Determine Area of Hazard* = SQ. FT.
* (L x W) or (.785 D2)
2. Choose Application Rate =
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4. X =
Flow rate of solution % of FLC Gallons of FLC per/minute
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Gallons of FLC per/minutes Duration of flow Total FLC Required
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