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. They exist as alternatives to other modes of transport, e.g. railroad, trucks, barge, or ship and thus are regarded as transportation systems. Transportation pipelines include gathering lines from production wells to processing or refinement facilities, transmission lines from processors to storage or from storage to distribution systems or industrial customers, and distribution systems, e.g., truck terminals for refined fuels, or mains and services for natural gas. Gathering and transmission...