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 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

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).

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

NFPA 11

Tests have shown that foam may travel effectively across at least 100 feet of burning liquid surface.

Sometimes

Application 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 Time

Application Rates CalculatedExampleDetermine Area of Hazard = 3000 sq. ftApplication Rate = 0.20 GPMRate x Area + 600 GPM of Solution600 GPM x 3% Used = 18 GPM Concentrate18 x 15 minutes application time = 270 gals neededThis calculation example is based on a spill area of 75 x 40.

RequirementsBased 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.

PreplanBased 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 hydrants?

Quick Foam Flow Work Sheet

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

GPMSq. Ft.GPMGPMGPM%GallonsGallonsMinutes Gallons

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.