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Fire Extinguisher Training <br /> Using water on an electrical fire increases the risk of electrocution. If you <br /> have no choice but to use an APW on an electrical fire, make sure the <br /> electrical equipment is unplugged or de-energized. <br /> APW's will be found in older buildings, particularly in public hallways. It is <br /> important to remember, however, that equipment must be disconnected from its <br /> electrical source before using a water extinguisher on it. <br /> 2. Carbon Dioxide (CO2) <br /> No Gauge <br /> The pressure in a CO2 <br /> extinguisher is so great, <br /> (--Hard Horn bits of dry ice might��� <br /> (tray be on end of shoot out of the horn! <br /> hose in larger sizes) <br /> CO2 cylinders are red. They range in size from 5 pounds to 100 pounds or <br /> larger. On larger sizes, the horn will be at the end of a long, flexible hose. <br /> CO2's are designed for Class B and C (flammable <br /> liquids and electrical sources) fires only! <br /> CO2's will frequently be found in laboratories, mechanical rooms, kitchens, and <br /> flammable liquid storage areas. <br /> In accordance with NFPA regulations (and manufacturers' recommendations) all <br /> CO2 extinguishers at Stockton Tri Industries, Inc. undergo hydrostatic testing and <br /> recharge every five years. <br /> Carbon dioxide is a non-flammable gas that takes away the oxygen element of <br /> the Fire Triangle. CO2 is very cold as it comes out of the extinguisher, so it cools <br /> the fuel as well. <br /> A CO2 may not be very effective in extinguishing a Class A fire because it may <br /> not be able to displace enough oxygen to successfully put the fire out. Class A <br /> materials may also smolder and re-ignite. <br /> Oklahoma State University Page 3 <br />