The CO2 is used for the quenching of the fire to prevent fire conditions as a Precautionary measure. Carbon dioxide has many advantages as a fire extinguishing Agent. It is non-corrosive and non-conductor of electricity. Being dry it does not damage or even wet the material or machinery upon which it is discharged. When stored in cylinders its pressure is 60 kg/cm² (g) at 60 Deg. F. stored as a liquid under pressure and then released, Carbon dioxide has the tendency to expand and freeze. The liquid CO2 is pushed up through the flexible hoses and transported through the pipe as a liquid under pressure. The ratio of expansion from liquid to gas is about 1 to 9 i.e., 1 lb of liquid CO2 will fill approximately 9 cu.ft. of space at 60 Deg. F. and normal atmospheric pressure. When released, the stored pressure acts as a propellant. The CO2 passes through pipes and is discharged at the hazard. It functions by reducing the oxygen to a point where fire can no longer exist.
