compressed air foam systems (cafs). 124 air metering valves check valve water valve compressed air...
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Compressed Air Foam Systems Compressed Air Foam Systems (CAFS)(CAFS)
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Air MeteringValves
Check Valve
Water Valve
Compressed Air
Water Pump
FoamTank
WaterTank
Pres
sure
GaugesScrewAirCompressor
Foam Proportioner
Compressed Air Foam SystemCompressed Air Foam System
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CAFS ComponentsCAFS Components
Water pump
Compressor
Proportioner
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Complete SystemsComplete Systems
• Fire pump manufacturers offer full CAFS packages. Components are assembled, tested and calibrated as a complete system.
Darley “AutoCAFS”
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• Capabilities– Superior absorption of heat– Quick knockdown– Light hose lines: (per 100’ length)
– 1-1/2” Hose: Water - 103 lbs. CAFS - 35 lbs– 2-1/2” Hose: Water - 271 lbs. CAFS - 84 lbs
– Extended stream reach– Ability to make wet or dry foam
• Limitations– Tradition and knowledge base
Compressed Air Foam SystemsCompressed Air Foam Systems
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CAFS Is A Versatile Tool CAFS Is A Versatile Tool
• Limited only by the user’s imagination
– Think outside of the box
– Be progressive
– Be safe
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Nozzles For CAFSNozzles For CAFS
• Straight bore – CAFS bubble• Variable pattern nozzle – foam solution
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• High energy system– Can be pumped higher and further than water
at same psi due to lack of head pressure
• Lower foam concentrate % required – 0.2% - 0.3% vs. 0.5%
CAFS CharacteristicsCAFS Characteristics
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• Small strong uniform bubbles
• Greater foam durability
• Low expansion system
• User can easily adjust– Expansion ratio– Drain time– Foam type
CAFS CharacteristicsCAFS Characteristics
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• Light weight hose– Less strain on
firefighters
• Effect on hose– No water hammer– Reduced friction
loss
• Hose kinks– Effective hose
stream with kink
CAFS Safety CharacteristicsCAFS Safety Characteristics
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• High volume air compressor– Air tools– Air bags– Tires– Drain hose
Additional CAFS BenefitsAdditional CAFS Benefits
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Aerial CAFS DischargeAerial CAFS Discharge
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Thinking outside the box
Bumper Turret CAFS DischargeBumper Turret CAFS Discharge
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CAFS 5CAFS 5"" Handline HandlineWay outside the box
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Concentrate Delivery SystemsConcentrate Delivery Systems
• Many different levels of technology are used to deliver today’s water additives
• Fully understand the capabilities and limitations of each before deciding on a system