Afff Fire Extinguishers
The AFFF (Aqueous Film Forming Foam) fire extinguishers hold an importance place in the realm of fire safety engineering systems, fashioned to combat both class A (ordinary combustibles) and class B (flammable liquids). Instead of discharging liquid or powder, they release Aqueous Foam to put out fires. AFFF fire suppressors offer reliable safety against fire hazards by following the NFPA 10 and ISO standards.
AFFF FIRE EXTINGUISHER WORKING PRINCIPLE
AFFF fire suppressors contain a mixture of foam, water, and air which has low density than flammable liquids. A foamy substance is discharged through the nozzle that forms a film on water insoluble hydrocarbon surfaces, leading to instant fire and vapour suppression for class B fires. This film separates fuel form air and deprives it of oxygen. Water content helps drop down the temperature of burning material. While for class A fires, it works by offering excellent wetting and penetrating properties.
AFFF FIRE EXTINGUISHER SPECIFICATIONS —
SPECIFICATION | DETAILS |
Colour Code | Cream |
Foam Colour | Light amber/pale yellow/cream |
Composition | Water content: 94 to 96 %
Foam concentration: 3 to 6 % |
Sizes of AFFF Fire Extinguishers (Kg) | 2, 6, 9, 12, 25, & 50 kg |
Service Pressure | 14 – 28 bars |
Working Pressure | 15 bars |
Testing Pressure | 35 bars |
Operating Temperatures | -5°C to +55°C |
Shell Materials |
Stainless Steel & Brass – Both are durable, corrosion resistant, (Brass used for parts like nozzles & valves)
Aluminium – Durable, corrosion resistant, Lightweight Mild Steel & Carbon Steel – Both are robust & need protective coating against rust Plastic (Composite) – Very lightweight, non corrosive |
AFFF FIRE EXTINGUISHER TYPES
- Compact or Portable AFFF Fire Extinguishers – Small units of 2 to 9 kg, suitable for homes, offices, vehicles, small industrial settings.
- Trolley-Mounted AFFF Fire Extinguishers – Large units on wheeled trolleys (50 – 100 kg), Industrial settings, airports, large commercial areas.
- Stored Pressure AFFF Extinguishers – Single chamber for agent and expellant with less maintenance, used for commercial and residential settings.
- Cartridge Operated AFFF Extinguishers – Separate chambers for powdered agent and expellant gas with easy on-site recharging, well suited for industrial and harsh environments.
- Automatic AFFF Extinguishers – Fixed positioned and auto-activated, provides automatic protection for storage area, transformers, and flammable liquids’ storage room.
- Marine AFFF Fire Extinguishers – Used for marine vessels such as boats and ships with corrosion-resistant property. —————————————————————-
APPLICATIONS/USES OF AFFF FIRE EXTINGUISHER
They are used against class A fires such as solid combustibles (paper, wood & textiles) and class B fires, e.g., flammable liquids (paint, diesel, petrol & solvents). They usually have applications in areas such as shipboards, airports, military facilities, firefighting vehicles and industrial sites for rapidly knocking down the flames.
SAFETY PRECAUTIONS OF USING AFFF FIRE EXTINGUISHER
- Avoid using it in extremely cold temperatures. =
- Do not place extinguisher in sunlight or near to heating vents.
- Avoid Inhaling foam fumes, if it is operated in an enclosed space ensure proper ventilation.
- Use PPE (personal protective equipment) like face shield, gloves and goggles, especially in case of class B fires.
What is the main disadvantage of AFFF fire extinguishers?
They get hazardous if used on cooking fires or flammable gas fires, and they may also damage electrical appliances.
What temperature is AFFF foam stored at?
It is best to store it at a temperature range of 2⁰C to 49⁰C, prolonging its shelf life up to 10 years. To extend its shelf life, it should not be exposed to extreme temperatures and be contaminated with foreign materials.
AFFF Fire Extinguisher Price in Pakistan
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CONCLUSION
AFFF fire extinguishers are critical fire safety tool for the environment with flammable liquids and solid combustibles. Properly understanding their operation, types, sizes and pressure specifications establish the efficacious fire safety system. AFFF fire extinguishers provide a dependable solution for stopping and controlling fire with their ability to suppress fires effectively, thus ensuring security in different environments.