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2011年6月27日,西气东输二线广州末站检测到纯天然气,西气东输二线干线黄陂以南段顺利完成天然气置换工作,全线投产进入最后冲刺阶段。为确保安全,西气东输二线干线及支线投产全部采用“气推气”方式进行。置换时在空气、氮气和天然气界面之间不加隔离球,通过气体之间的直接接触实现置换,利用氮气作为惰性气体的物理性质隔离管道中
On June 27, 2011, pure natural gas was detected at the terminal station of the Second West-East Gas Pipeline in Guangzhou, and natural gas replacement was successfully completed at the southern section of Huangpi in the second-line trunk line of the West-East Gas Pipeline. All production lines entered the final sprint stage. In order to ensure the safety, all the trunk lines and branch lines of the second West-East Gas Pipeline are put into operation in the manner of “gas and gas”. Replacement at the air, nitrogen and natural gas interface without isolation ball, through the direct contact between the gas to achieve replacement, the use of nitrogen as an inert gas physical properties of the isolation pipeline