Compressors are a vital link in the conversion of raw materials into refined products. Compressors also handle economical use and transformation of energy from one for into another. They are used for the extraction of metals and minerals in mining operations, for the conservation of energy in natural gas injection plants, for secondary recovery processes in oil fields, for the utilization of new energy sources such as shale oil and tar sands, for furnishing utility or reaction air, for oxygen and reaction gases in almost any process, for process chemical and petrochemical plants, and for the separation and liquefaction of gases in air separation plants and in LPG and LNG plants. And, as the reader will undoubtedly know, this listing does not even begin to describe the literally hundreds of services that use modern compression equipment.