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The
petroleum industry is usually divided into three major components:
upstream,
midstream and
downstream. The midstream sector involves the transportation (by pipeline, rail, barge,
oil tanker or truck), storage, and wholesale marketing of crude or refined petroleum products. Pipelines and other transport systems can be used to move crude oil from production sites to
refineries and deliver the various refined products to downstream distributors. Natural gas pipeline networks aggregate gas from
natural gas purification plants and deliver it to downstream customers, such as local utilities.
