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Types of Concentrates (Water Additives)
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13 Foam Concentrate - Water Additives Wetting agents Class A foam concentrate –Class A Foam Class B foam concentrate –Protein & Film Forming Fluoroprotein (FFFP) –Aqueous Film Forming Foams (AFFF) –Alcohol Resistant-AFFF (AR-AFFF) Emulsifiers / Spill response agents Gels Not to be mistaken for Class A concentrate
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14 Class A foam (Proportioned 0.1-1.0%) –Wood, paper, tires, any Class A combustible –Effective in initial attack, overhaul, mop-up and exposure protection –Does NOT affect application rates or manpower requirements Class B foam (Proportioned 1.0-6.0%) –Hydrocarbons and polar solvents Emulsifier/Spill response agent (Various rates) –“Fuel neutralizer” and hydrocarbon recovery Gel (Various rates) –Exposure protection Concentrate Usage
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Class A Foam
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16 Finished foam adjusted by concentrate percentage using the proportioner Wet 0.2% Fluid 0.5% Dry 1.0% Overhaul Initial Attack Exposure Class A Foam Characteristics
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17 Small bubble structure and quick drain time Wet Foam At 0.2% - Overhaul
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18 Medium bubble structure and slower drain time Fluid Foam At 0.5% - Initial Attack
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19 Produces a dry foam blanket with a very slow drain time Dry Foam At 1.0% Exposure Protection - Long Lasting
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20 Foam Properties Expansion ratio –Volume of finished foam to volume of foam solution –Hose-end appliance dictates expansion ratio –Based on amount of air introduced –Low Expansion1:1 - 20:1 –Medium Expansion 20:1 - 200:1 –High Expansion 200:1 +
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21 Exterior Low Expansion Application
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22 Medium Expansion Foam
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23 Flowing down a hillside High expansion generator High Expansion Foam
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The Value Of Using Class A Foam Improves Fire Fighting Effectiveness By 2 To 4 Times
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25 Salem Tests Fire Engineering, February 1993 Temperature drop from 1,000° F to 212° F, at a four foot level Water CAFS Foam Water: 223 Seconds Foam: 103 Seconds CAFS: 39 Seconds
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26 Crib burn - controlled test conditions –Class A foam vs. plain water –40% less solution than plain water –43% less extinguishing effort than with plain water (extinguishing agent volume x time to extinguish) Conclusion –Reduced exposure to hostile environments and improved fire fighter safety Dr. Holger de Vries (Germany) Fire Chief Magazine, August 1999
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27 Palmdale Study Fire Chief Magazine, August 2001
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28 L.A. County Fire Dept. scientifically conducted tests to compare effectiveness of: –Plain water –Foam solution –Compressed air foam Temperature readings obtained via wall and ceiling mounted thermocouples at one foot increments Palmdale Study
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29 Three identical 1100 sq./ft. homes and contents Palmdale Study
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30 Critical Application Rate The IOWA formula was used to calculate flow rate = GPM Cubic Feet Involved 100 = 91 9,075 100
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31 Knockdown Time Results Water Foam CAFS Water: 50 seconds Foam: 25 seconds 50% better than water CAFS: 11 seconds 78% better than water 66% better than foam
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32 Gallons Required To Knockdown Water Foam CAFS Water: 73 gallons Foam: 44 gallons 40% better than water CAFS: 16 gallons 79% better than water 64% better than foam
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33 Total Gallons Used Water Foam CAFS Water: 320 gallons Foam: 95 gallons 71% better than water CAFS: 45 gallons 86% better than water 53% better than foam After 225 gallons, IC ordered foam to aid overhaul
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34 Time To Cool: 600°F To 200°F Water Foam CAFS Water: 6:03 min Foam: 1:45 min 71% better than water CAFS: 1:28 min 76% better than water 17% better than foam
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35 Total Foam Concentrate Used Foam CAFS Concentrate Cost: $15/gal Foam Solution: 31 oz = $3.63 CAFS: 5.8 oz = $0.68
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36 What These Tests Prove Naturally aspirated foam (NAF) beats water –Time to knockdown –Gallons to knockdown –Total water used –Cooling Compressed Air Foam beats NAF - in all categories
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37 Why Does Foam Work? Smaller droplets – faster heat absorbtion Reduces surface tension – penetrates and wets fuel Foam blanket – provides protection
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38 Surface tension causes water to bead up on fuel… Water And Class A Concentrate
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39 Add Class A foam to plain water… solution spreads and penetrates the fuel… Water And Class A Concentrate
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40 Chance of rekindle lessens with Class A solution Water And Class A Concentrate
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41 Give It A Try Place a small drop of plain water on piece of corrugated cardboard (Note: it maintains beaded shape, caused by surface tension) Place a small drop of soapy water next to it (soap is a surfactant similar to Class A) Which would provide better extinguishment and have less runoff?
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42 Water Foam CAFS Why Use Water Additives?
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43 Class A Foam Applications
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44 Fire Reported! 1890’s brick schoolhouse –4 miles outside of town –No hydrants First pumper on scene –6 minute response –750 gallons of water –FoamPro 2001
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45 Fire Knocked Down! Initial attack –2-1/2” line –328 gpm –0.5% Class A foam Knockdown – 6 seconds – 33 gallons of water – 0.17 gallons of Class A foam concentrate
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46 Water: – 750 gpm supplied by: – Two 2-1/2” – Two 1-3/4” – No effect Tire Fire Class A Foam Class A foam: – 60 gpm @ 0.5% – Medium expansion – 20 minute knockdown Tire Fire Plain Water Effectiveness On Tire Fires
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47 Class A foam attack - 125 gpm at 0.5% Fully Involved Garage!
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48 Garage After 35 Second Attack NOTE: Lack of smoke; ability of Class A foam to bond with carbon
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49 200' x 24' x 35' wood frame structure Attack with single 1 ½" CAFS line with 1" tip Approximately 50 gpm, 20 cfm at 0.5% Structural – Exterior Attack
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50 Exposure on left protected with foam CAFS attack begins Structural – Exterior Attack
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51 CAFS attack continues Structural – Exterior Attack
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52 Exterior Structure Attack with Low Expansion CAFS stream
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53 Improves firefighter safety Increases efficiency of plain water 2 to 4 times Faster fire knockdown Reduces heat rapidly Reduces property damage Reduces overhaul Fewer rekindles Exposure protection Preserves evidence Faster cleanup Reduces on scene time Benefits Of Class A Foam To The Department
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54 Points To Ponder Immediately reduce your fire losses by 50 to 75% … just by implementing Class A foam or CAFS. What other initiative would have as significant an impact for your department? If this is not a top priority for your department, why not?
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Class B Foam & Emulsifiers
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56 Designed to form a film and seal vapors Applied at 1%, 3%, or 6% per foam manufacturer Polar solvents require alcohol resistant (AR) foam Multi-use foam can be used on both –Concentration ratios are 1%x3%, 3%x3%, and 3%x6% (second percentage for polar solvents) Class B Foam
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57 Fuel must be contained to form film Class B Foam
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58 Training Real life –If no containment: –No film forming seal –Then alternatives are: –Class A foam –Emulsifiers Containment Challenges
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59 Types Of Class B Concentrate Film Forming FluoroProtein (FFFP) Aqueous Film Forming Foam (AFFF) Alcohol Resistant-Aqueous Film Forming Foam (AR-AFFF)
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60 Capabilities: –Biodegradable –Excellent fuel shedding –Long lasting foam blanket and high burn-back resistance Limitations: –Requires aspiration –Used at ratios 3% or 6% –Poor at flowing and wetting (messy and smelly) Film Forming FluoroProtein (FFFP)
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61 Capabilities: –Does not require specialized delivery equipment –Fluid foam that spreads across the fuel surface –Quick knockdown –Long shelf life in original sealed container (unopened) Limitations: –Fast drain time –Limited burn-back resistance –May be hazardous –Storage and shelf-life once original container is opened –Use only on hydrocarbons at 1%, 3% or 6% ratios Aqueous Film Forming Foam (AFFF)
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62 Alcohol Resistant-Aqueous Film Forming Foam (AR-AFFF) Capabilities: –Multi-use fuels (Hydrocarbons/Polar Solvents) –Excellent burn-back resistance and stable foam blanket –Long shelf life in original sealed container (unopened) Limitations: –Does not require aeration delivery equipment –Viscous liquid difficult to premix –May be hazardous –Storage and shelf-life once original container is opened –Used at 3% and 6% ratios (Multi-use 1%x3%, 3%x3% or 3%x6%)
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63 What To Consider -“B” Concentrates Cost of solution vs. concentrate –Your application – hydrocarbon or polar solvent Shipping, storage and handling –Significant logistics improvement with lower ratios –Given storage capacity - added protection Mutual aid Proportioning system –Higher concentration ratios require larger systems –Lower concentration ratios require high accuracy
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64 Do Not Mix Class A & B Foam Result of mixed foam (in strainer)
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65 Emulsifiers / Spill Response Agents Capabilities: –Non-toxic and biodegradable –Long term vapor suppression –Aids in hydrocarbon recovery Limitations: –Limited extinguishing potential –Application rates vary with products-high cost –Application by volume not by percentage –Not compatible with Polar Solvents –No approval process or recognized performance standard
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66 Gel Capabilities –Excellent insulator –Long term exposure protection Limitations –Limited extinguishing potential –High cost –May cause slippery work areas –Solution viscosity very high-most products require hose end eductor –No approval process or recognized performance standard
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67 PoorAverageExcellent Extinguishing Agent Synopsis
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