When To Use A Wet Chemical Fire Extinguisher? Wet chemical fire extinguishers are recommended to extinguish class A and class F fires. Wet chemical fire extinguishers are highly recommended as a safety precaution within commercial kitchens where it is more common for a fire to ignite, involving cooking oils and fats.
What is a wet chemical fire extinguisher used for?
Wet chemical fire extinguishers tackle fat and grease fires in kitchens (Class F), for example deep fat fryer fires. In addition, some wet chemical extinguishers can tackle Class A fires (wood, paper etc) and Class B fires (eg petrol).
When should you not use a wet chemical fire extinguisher?
Extinguishers such as Water, Foam, Powder & CO2 will not always put out big cooking fires and are also extremely dangerous because the pressure of these extinguishers can cause the oil to jet out and cause serious harm.
How do you put out a wet chemical fire?
In extinguishing Class F fires, wet chemicals work by covering the flammable liquid using a blanket of foam. This foam blanket then forms a crust on top of the fat or cooking oil. As a result, the oxygen supply to the other elements of combustion is cut off. This hinders the process of combustion from continuing.
What type of fire should be tackled with a wet chemical fire extinguisher?
Wet Chemical Extinguisher
Wet chemical fire extinguishers are ideal for Class F fires, involving cooking oils and fats, such as lard, olive oil, sunflower oil, maize oil and butter.
What is the chemical used in dry chemical fire extinguisher?
A dry chemical extinguisher sprays a very fine powder of sodium bicarbonate (NaHCO3, baking soda), potassium bicarbonate (KHCO3, nearly identical to baking soda), or monoammonium phosphate ((NH4)H2PO4). These solids coat the fuel and smother the fire.
How can you tell if a chemical extinguisher is wet?
How Do You Identify a Wet Chemical Fire Extinguisher?
- There will be a YELLOW-coloured label on the body of the extinguisher, which will read – WET CHEMICAL.
- The hose will be longer than typical fire extinguishers and will also have a lance attachment.
Which extinguisher should you not use to put out a flammable liquids fire?
Water extinguishers are used on Class A fires involving solid combustibles. They are not suitable for fires fuelled by flammable liquids or where electricity is involved.
What must you not use water and foam extinguishers on?
Don’t Add Water
Never use a water extinguisher on electrical fires or any fire involving a flammable liquid. As any science student will tell you, water conducts the current. If you spray water onto an electrical fire, inadvertently or intentionally, you risk electrocuting yourself.
When using foam a Class B fire is extinguished by?
Foam extinguishes Class B Fires by covering the flammable liquid with a foam blanket, thus cutting off the oxygen supply from the combustion process.