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在过去的三年里,由于美国东部地区对天然气的需求日益增长,各输气公司纷纷增加新的天然气管线,用以把美国西部和加拿大山区的天然气源源不断地送往东部。Pony Express管线是一条由输油管线改造而成的输气管线。这条管径为20英寸的Pony Express管线长达500
Over the past three years, due to growing demand for natural gas in the eastern United States, various gas companies have added new natural gas pipelines to send steady flow of natural gas in the western United States and Canada to the east. The Pony Express pipeline is a gas pipeline transformed from an oil pipeline. This 500-inch Pony Express pipe is 20-inch diameter