This unique reference book is intended for both professionals and academics in the field of gas supply (gas transport, gas distribution, and plant construction) and are involved in the design, planning, and operation of gas pipelines/gas grids. This book is problem-based, comprising of self-contained main topics, that are relevant for the design of gas supply and transport systems. By observing the general physical and thermodynamic principles as well as the fundamentals of fluid mechanics, the characteristics of the gas supply are described. Such elements include: pipelines, separators, compressors, pressure regulating and metering stations, as well as gas storages. In regards to the planning, calculation, and design of systems, system components, and equipment, the application of accurate, realistic, and practically compliant methods is emphasized. The calculation of all the relevant material data is discussed in detail in connection with the calculation and design of pipelines, compressors, expansion systems, control systems, and storages.In addition to the physical and technical aspects of the plant and system planning, economic considerations are also made regarding optimal designs of equipment and systems.