COMPRESSED GASESDOE-HDBK-1015/2-93Hazards of Chemicals and GasesCH-05Rev. 0Page 16COMPRESSED GASESGases are commonly used throughout industry. These gases come in severalforms and are often as dangerous as they are useful. This chapter providesbackground knowledge of these gases. EO 1.7DEFINE the following terms:a.Compressed gasc.Liquified gasesb.Non-liquified gasesd.Dissolved gasesEO 1.8STATE the five major families of gases.EO 1.9STATE the general safety precautions regardingthe use, handling, and storage of gases.EO 1.10STATE the safety precautions for working withcryogenic liquids. EO 1.11LIST the physical properties and specialprecautions for the following gases:a.Hydrogenb.Oxygenc.NitrogenCompressedGasesGases in compressed form serve countless indispensable roles in modern technology. Oxygenis used extensively to produce stronger and cheaper steels. Acetylene welding and brazing ofcertain metals has been common for many years. Other compressed, flammable gases such ashydrogen are equally necessary for the welding of certain metals. Some metals and alloys (suchas stainless steel, titanium, and zirconium) can be welded only under an inert gas atmosphere.Carbon dioxide is used extensively in fire extinguishers for chemical and electrical fires. In thenuclear industry, uses of compressed gases range from the addition of nuclear grade hydrogento reactor plant systems to propane and butane for heating components or spaces.Gases are compressed for practical reasons of transportation, storage and use. The definitionof compressed gas by the Interstate Commerce Commission (ICC) reads: "... any material ormixture having in the container an absolute pressure exceeding 40 psi (pounds per square inch)at 70 F, or regardless of the pressure at 70 F, having an absolute pressure exceeding 140 psiat 130 F; or any flammable material having a vapor pressure exceeding 40 psi at 100 F."
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