Foam Application Rates for E85 and E-95. Application Rates Described in Terms of the Amount in...
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![Page 1: Foam Application Rates for E85 and E-95. Application Rates Described in Terms of the Amount in Gallons of Foam Solution Reaching the Total Square Footage.](https://reader035.fdocuments.in/reader035/viewer/2022072006/56649d215503460f949f6935/html5/thumbnails/1.jpg)
Foam Application Rates for E85 and E-95
![Page 2: Foam Application Rates for E85 and E-95. Application Rates Described in Terms of the Amount in Gallons of Foam Solution Reaching the Total Square Footage.](https://reader035.fdocuments.in/reader035/viewer/2022072006/56649d215503460f949f6935/html5/thumbnails/2.jpg)
Application 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
![Page 3: Foam Application Rates for E85 and E-95. Application Rates Described in Terms of the Amount in Gallons of Foam Solution Reaching the Total Square Footage.](https://reader035.fdocuments.in/reader035/viewer/2022072006/56649d215503460f949f6935/html5/thumbnails/3.jpg)
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).
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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 = Ethanol
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NFPA 11
“Tests have shown that foam may travel effectively across at least
100 feet of burning liquid surface”.
“Sometimes”
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Application Rates Calculated
1. Determine Area of Hazard
2. Choose Appropriate Application Rate
3. Rate x Area = GPM of Foam Solution
4. Solution GPM x % Used = Concentrate GPM
5. Concentrate GPM x Time = Total Concentrate
• Storage Tanks - 60 Minute Flow Time
• Spills - 15 Minutes Flow Time
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Application Rates CalculatedExample
• 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
needed
This calculation example is based on a spill area of 75’ x 40’.
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Requirements
• Based 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.
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Preplan
Based 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?
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Quick Foam Flow Work Sheet
1. Determine Area of Hazard* = SQ. FT.* (L x W) or (.785 D2)
2. Choose Application Rate =
3. X =
4. X =Flow rate of solution % of FLC Gallons of FLC per/minute
5. X = Gallons of FLC per/minutes Duration of flow Total FLC Required
GPM
Sq. Ft. GPM GPM
GPM % Gallons
GallonsMinutes Gallons
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• 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.