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Transportation pipelines are built for the purpose of transporting a liquid or gaseous commodity from points of production to process facilities, or from points of refinement to storage or end-use customers. This chapter briefly reviews several individual ASME codes and standards that are directly important to transportation pipelines, namely B31.4, Transportation Systems for Liquid Hydrocarbons and Other Liquids (2016 Edition); B31.8, Gas Transmission and Distribution Piping Systems (2016 Edition); B31.8S, Managing System Integrity of Gas Pipelines, Supplement to B31.8 (2014 Edition); B31G, Manual for Determining the Remaining Strength of Corroded Pipelines (2012 Edition); and B31Q, Pipeline Personnel Qualification (2016 Edition). It covers the scope, design and materials, dimensional requirements, construction and assembly, inspection and testing, operation and maintenance, and risk factors for each of these fluid transportation systems. The chapter examines the technical basis for important differences in design principles and practices between buried transmission pipelines and above-ground piping. Standards for the design, construction, operation, and maintenance of pipelines are represented by B31.4 and B31.8. Standards associated with integrity management are represented by B31.8-S, B31G, and B31Q. It is also noted that B31.4 and B31.8 address operation and maintenance through the full life cycle of the facility, an important distinction from B31.1 and B31.3.