Best answer: How does an AFFF fire extinguisher work?

When applied to a hazard, AFFF produces an aqueous film that spreads across the surface of the fire to extinguish the flame. This film is what gives AFFF its name, and it works by suppressing flammable liquid vapor, effectively suffocating the fire hazard.

How does a foam fire extinguisher put out fire?

When the extinguisher is used, the stored pressure drives out the foam solution, which swirls around in the nozzle, producing a fine spray of foam in a much larger volume than the extinguisher itself. … The foam seals the fire from its oxygen supply, and secondly the moist foam cools the burning material.

What is an AFFF fire extinguisher?

AFFF (Aqueous Film Forming Foams) Foam Fire Extinguishers are suitable to fight burning solids such as wood as well as liquid fires such as burning petrol. The foam has the ability to creep over the burning liquid or to soak into burning materials such as settees.

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What should you not use a foam extinguisher on?

Foam Extinguisher (AFFF)

Do not use on chip or fat pan fires. For fires involving solids, point the jet at the base of the flames and keep it moving across the area of the fire. Ensure that all areas of the fire are out. For fires involving liquids, do not aim the jet straight into the liquid.

What should you not use a foam fire extinguisher on?

Foam extinguishers are also safe for use on flammable liquid fires. They CANNOT be used on electrical fires or flammable metal fires as this extinguisher could end up exacerbating the fire.

What is AFFF made of?

Synthetic foams

Aqueous film forming foams (AFFF) are water-based and frequently contain hydrocarbon-based surfactant such as sodium alkyl sulfate, and fluorosurfactant, such as fluorotelomers, perfluorooctanoic acid (PFOA), or perfluorooctanesulfonic acid (PFOS).

Can AFFF be used on electrical fires?

AFFF (Aqueous Film Forming Foam) fire extinguishers are ideal for any office environment. … These extinguishers also have a conductivity rating of 35kV which means that, although they are not designed for use on electrical fires, they can be safely used on typical electrical office equipment.

Where do you use AFFF fire extinguisher?

Where are AFFF Foam Extinguishers most suitable for use? AFFF Foam Fire Extinguishers are very popular for Homes, Flats, Cars, Caravans, HGV’s & Boats. Being suitable for use on Class A Fires, which includes Wood, Paper & textiles they are ideal for offices.

What does the blue band on a fire extinguisher indicate?

There are five fire extinguisher colours: Red – Water (both spray and mist) Blue – Dry powder. Cream – Foam.

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What fire extinguisher would you use for a chip pan fire?

As stated above if you have a chip pan or deep fat fryer anywhere on your business premises, you need a Class F extinguisher. Whether it is a canteen, professional kitchen, school food technology classroom, or food truck, this is something which any professional fire risk assessment should flag as extremely important.

Which 2 fire extinguisher should not be used in confined spaces?

It is advised not use a CO2 fire extinguisher in a confined space, as it displaces oxygen and can asphyxiate the operator and other users.

Which fire extinguisher is used for fabrics and clothes?

Use: Water fire extinguishers are best for combatting Class A fires, for example fires involving organic solid materials, such as wood, cloth, fabric, paper and plastics.

What are the 5 fire classifications?

Fire is divided into five classes (A, B, C, D, and K) that are primarily based on the fuel that is burning. This classification system helps to assess hazards and determine the most effective type of extinguishing agent.

When suppressing an electrical fire What precaution should be taken?

Put Your Safety First

  1. Disconnect the Electricity. First, disconnect the electricity to the source of the fire. …
  2. Use Baking Soda for Small Electrical Fires. If the fire began in an appliance or an overloaded cord, once you’ve unplugged the power source, toss baking soda over the flames. …
  3. Never Use Water While the Power Is On.