What kind of water is in a water fire extinguisher?
Water mist extinguishers are a type of water fire extinguisher that uses distilled water and discharges it as a fine spray instead of a solid stream. Water mist extinguishers are used where contaminants in unregulated water sources can cause excessive damage to personnel or equipment.
What is a water fire extinguisher made of?
Types of fire extinguishers. There are four main types of extinguishers and they work in slightly different ways: Water extinguishers, which are the most common, are essentially tanks full of water, often with nitrogen or carbon dioxide as the propellant to make them come out.
What should you use a water fire extinguisher?
Traditional water fire extinguishers are suitable for use on class A fires involving solid combustible materials such as wood, paper and textiles. Please note that modern water mist extinguishers with de-ionised water can also be used on B, C and electric fires. Only tackle small fires with an extinguisher.
Does a water extinguisher remove oxygen?
Once the fire starts, it provides heat and keeps burning. That is why throwing water on a fire puts it out. When water hits fire it boils, turns to steam and floats away, taking some heat with it. It also prevents oxygen from reaching the fuel.
What is ABC in fire extinguisher?
An “ABC” extinguisher will have a label like this, indicating that it may be used on class A, B and C fires. Dry chemical extinguishers put out fire by coating the fuel with a thin layer of dust, separating the fuel from the oxygen in the air.
Why Sodium bicarbonate is used in fire extinguisher?
Sodium bicarbonate is used in fire extinguishers because carbon dioxide is produced when it reacts with the high heat of the fire.
How do water extinguishers work?
How do Water Extinguishers work? Water and Water Additive Fire Extinguishers work by spraying a jet of water at the fire, which extinguishes the flames and the burning materials, preventing the fire re-igniting.
What chemical is in dry powder 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.
Can you use water fire extinguisher on flammable liquids?
Water fire extinguishers are NOT suitable for electrical fires as water is a conductor and you are at risk of electrocution if used on this type of fire. They are also NOT suitable for flammable liquids or flammable metal fires as it will not extinguish the fire.
Why water is a good fire extinguisher?
Water has a higher specific heat than most common substances, and this is one of the reasons it is such an effective extinguishing agent. … Smaller water droplets have larger surface area to mass of water, which means each droplet has more surface to absorb heat energy while having less water to heat up.
What is CO2 in fire extinguisher?
Carbon Dioxide extinguishers are filled with non-flammable carbon dioxide gas under extreme pressure. You can recognize a CO2 extinguisher by its hard horn and lack of pressure gauge. The pressure in the cylinder is so great that when you use one of these extinguishers, bits of dry ice may shoot out the horn.
Why do firefighters use water to put out fires?
The most common method is to use water to put out the fire. The water takes away heat by cooling the fire. Water also smothers the fire, taking away oxygen. Some firefighters use foam as an alternative to water.
Why water is not used in electrical fires?
You should never throw water on an electrical fire because water conducts electricity and you could be electrocuted. 2. If you don’t have a fire extinguisher, you can use baking soda to extinguish an electrical fire.