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What is the difference between metallic and nonmetallic pipes and their benefits? Both, gas as well as an oil pipeline in India, are transported through pipelines. They are the main component of the entire infrastructure. In earlier days, when oil was the only fuel, whiskey barrels were used to store oil. Then horses were used to transport these barrels from wells to railway stations. Then later people started using wood and metal pipelines. As the technology evolved, pipeline installation started happening with cast iron pipelines. The same was later replaced by steel.