In 1928, DuGas (later bought by ANSUL) came out with a cartridge-operated dry chemical extinguisher, which used sodium bicarbonate specially treated with chemicals to render it free-flowing and moisture-resistant. Carbon dioxide based extinguisher – 2, 3, 4 and 5 kg v) Clean agent extinguisher – 2, 4 and 6 kg vi) Water mist type extinguisher – 2, 3, 4, 6 and 9 litres b) Based on Class of fire test : Class A/ Class B/ Class C/ Class D/ Class F (The fire rating shall be declared by the manufacturer) 2. Carbon dioxide fire extinguishers are used effectively at Class B (oil and flammable liquid fire), C class (electric tools fire) fires. Driving University of Alberta vehicles. 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. Office of Environmental Health & Safety, 06. They have an advantage over CO2 extinguishers in that they leave a blanket of non-flammable material on the extinguished material which reduces the likelihood of re ignition. Wear the Appropriate Safety Equipment for the Job at Hand, 21. The multipurpose Dry Chemical Extinguisher for a Type A,B,C fire is what you will find in most university laboratories that contain chemicals. The key to putting out a fire with an extinguisher is to use the PASS strategy: Pull the pin, Aim the hose, Squeeze the lever, and Sweep the hose. A carbon dioxide (CO 2) fire extinguisher is a firefighting tool that is loaded with pressurized carbon dioxide gas. A fire extinguisher works much like a can of hair spray. Higher numbers mean more firefighting power. Carbon Dioxide (CO2) Fire Extinguishers. This is stored in the extinguisher as a liquid, and the gas is created under pressure when the handle of the extinguisher is squeezed. Secondly, a Type A fire will usually reignite as soon as the CO2 gas dissipates. Close the door to a room with a fire and leave the door unlocked; the fire department will need to enter. CARBON DIOXIDE (CO 2) PORTABLE FIRE EXTINGUISHER Built tough and easy to service. What is the proper way to use a Class BC, CO2 fire extinguisher? Admittedly, CO2 fire extinguishers offer no post-fire security and the fire could easily reignite. You cannot use a water extinguisher for a Type B fire,(flammable liquids), as flammable liquids are lighter than water and will float on the surface of the water. It is not easy to verify whether a CO2 extinguisher is still filled or has suffered a loss in pressure and content. Water extinguishers are good for Type A Fires only. Also, the discharge horn of the extinguisher has to be removed for this purpose. The desired pressure during CO2 filling is 55 bar. There are three types of fires listed on the above diagram; not all extinguishers can be used on each type of fires. Fire extinguisher courses are available through EH&S’s Moodle Website. If applied correctly, it effectively reduces the oxygen content in the air around the fuel to below … This is dangerous and should not be done without prior training, as an accidental discharge without the horn can lead to serious injury. Macroscale and Microscale Organic Experiments (6th Edition) Edit edition. Clause 3.1(a) of IS 2878 : 2004 ‘Specification for fire extinguisher, carbon dioxide type (portable and trolley mounted) (third revision)’ shall also be deleted simultaneously with the implementation of IS 15683. You should have an approved class D extinguisher if you have flammable metals in your lab area. Waste Disposal for Broken Glass & Sharps, 32. A CO2 extinguisher is not a good choice for a Type A fire, (wood, paper, cloth), because of the force of the CO2 gas being expelled from the extinguisher. Such extinguishers are ideal for Class A fires where a potential Class C hazard exists. Save my name, email, and website in this browser for the next time I comment. At a filling pressure of 55 bar and room temperature the CO2 in the extinguisher is neither a liquid nor a gas. It was once thought that it worked by cooling, although this effect on most fires is negligible. Because using the extinguisher on that classof fire would create additional risk ... What is generally the maximum distance a CO2 extinguisher can be expected to reach? In Australia, there are a total of 5 fire extinguisher classes. Do not turn your back on a fire and keep your exit from the room open and accessible at all times. Your email address will not be published. The type of fire will determine the type of extinguisher that can be used. Only attempt to put a fire out if you have a clear exit from the room. The cold helps to lower down the heat of the fire, consequently killing it. Close the door to a room with a fire and leave the door unlocked; the fire department will need to enter. Point the extinguisher discharge horn at the front edge of the base of the fire (the lowest point of the fire nearest you). You have to register to attend one of these courses. You cannot use a water extinguisher on a Type C fire, (electrical fire), because you run the risk of receiving an electrical shock. Remember - extinguishers are designed to be operated in an upright position. Carbon dioxide is an invisible gas that is denser than air. There are at least eight types of fire extinguishers: Carbon Dioxide (CO2) Thank you, have a good day. One 10 kg dry powder extinguisher (stored pressure) or 6.5 kg carbon dioxide extinguisher or 5 kg clean agent for 100 m 2 of floor area or part thereof, with minimum of one extinguishers of the same type for every compartment; extinguisher should be available within a radius of 15 m. CO2 extinguishers are colour coded with a black field on the otherwise red extinguisher. A. The carbon dioxide extinguisher pushes oxygen away from the fire and replaces it with carbon dioxide, which is inflammable and more dense than air. Primarily for use on fires of electrical origin, a CO2 fire extinguisher is particularly suitable for offices where there is a lot of electrical office equipment such as computers, printers and copiers. You are not required to put the fire out – but if you attempt to extinguish a fire then you need to know your fire extinguishers. Carbon Dioxide Fire Extinguishers – Maintenance. You should never attempt to put a fire out until you have been trained in the proper use of a fire extinguisher. Risk Management and Hazard Assessment, 08. Knowing how to operate a fire extinguisher could save your life in an emergency. The two ingredients of carbon dioxide are; baking soda and vinegar. As you can see below, Halotron is capable of extinguishing a fire at a further distance than a CO 2 fire extinguisher. You must contact Facilities and Operations to advise that your lab has flammable solids so they can provide you with the appropriate extinguisher. CO2 fire extinguishers contain carbon dioxide gas (CO2) under very high pressure (about 55 bar at room temperature) and can be easily recognised by their flute-shaped discharge horn. If the cylinder will not fire – leave the area immediately. Because of this, the discharge scope of the carbon dioxide stream is only between 3 and 10 feet. It just feels as if it were empty! 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