COMPRESSED GASESDOE-HDBK-1015/2-93Hazards of Chemicals and GasesCH-05Rev. 0Page 26OxygenOxygen (O ) supports combustion, but does not burn. Even so, it must be considered a2potentially hazardous element from a fire hazard standpoint. The results of an enriched oxygenatmosphere include a lowered ignition temperature, an increased flammable range, and anacceleration of the burning rate. Oxygen readily combines with other elements and compounds,with spontaneous ignition in some cases. When oxygen comes in contact with oil, grease, or fueloils, it may ignite violently. Every possible precaution must be taken to prevent thiscombination.Oxygen sustains life, but if pure oxygen were inhaled continuously for extended periods, thereactions in the body would be too rapid and would cause harmful effects. Oxygen shouldalways be referred to as oxygen, and not air, to prevent confusion. It should never be used torun pneumatic equipment because of the possibility of coming in contact with oil that may beinside the equipment. Finally, oxygen valves should be operated slowly. Abruptly starting andstopping oxygen flow may ignite contaminants in the system.SourcesofIgnitionAll known sources of ignition must be eliminated in areas that contain, or may contain,flammable gases. This includes areas where gases are being manufactured or used in someprocess and in areas where they are stored.One potential source of ignition is electrical equipment. When used or installed in hazardouslocations, this equipment must be explosion-proof and properly installed.Electrical equipment includes not only the more obvious equipment such as motors, generators,motor controls, switches, and lighting fixtures, but also the not so obvious equipment such asalarm systems, remote controls, telephones and other communication systems.The use of unapproved portable electric tools and equipment should be strictly prohibited inhazardous locations. When temporary lighting is used, it must be an approved type and inexcellent repair.All possible sources of static electricity should be anticipated to prevent its buildup anddischarge. Several methods of control may be used. It is necessary that conductive parts of asystem be bonded (described in the following chapter) together to eliminate the difference inpotential between the parts, and the whole system grounded to eliminate the difference inpotential between the system and ground.
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