توضیحات

The new and updated 6th edition of Industrial Motor Control is the most comprehensive revision of the book since it was published over 20 years ago. With crucial, up-to-date information on basic relay control systems, programmable logic controllers, and solid state devices commonly found in an industrial setting, this book is a must have. It presents easy-to-follow instructions and the essential information for controlling industrial motors, along with commonly used devices in contemporary industrial settings. Coverage is thorough in scope, successfully bridging the gap between industrial maintenance and instrumentation. Readers will gain a fundamental understanding of the operation of variable frequency drives, solid state relays, and other applications that employ electronic devices. Natural gas is the most energy-efficient fossil fuel; it offers important energysaving benefits when it is used instead of oil or coal. Although the primary use of natural gas is as a fuel, it is also a source of hydrocarbons for petrochemical feedstocks and a major source of elemental sulfur, an important industrial chemical. Its popularity as an energy source is expected to grow substantially in the future because natural gas can help achieve two important energy goals for the twenty-first century: providing the sustainable energy supplies and services needed for social and economic development and reducing adverse impacts on global climate and the environment in general. Natural gas consumption and trade have been growing steadily over the past two decades, and natural gas has strengthened its position in the world energy mix. Although natural gas demand declined in 2009, as a result of the economic slowdown, it is expected to resume growth in both emerging and traditional markets in the coming decades. Such increase in the near future will be driven because of additional demand in current uses, primarily power generation. There is yet little overlap between the use of natural gas and oil in all large markets. However, there are certain moves in the horizon, including the electrifying of transportation, that will push natural gas use to even higher levels. This chapter gives the reader an introduction to natural gas by describing the origin and composition of natural gas, gas sources, phase behavior and properties, and transportation methods.

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