安济天然气长输管道置换投产方案优选及实施

在天然气常用置换方案的基础上,通过对是否采用氮气置换、是否采用清管器隔离进行了论证,认为采用氮气置换可提高管道置换施工的安全性,而加清管器隔离并不是减少混气段的决定因素,因此确定安济天然气长输管道的置换投产方案为天然气—氮气—空气。并从注氮方案、注氮工艺参数、注氮总量、注氮安全措施等方面,重点介绍了安济天然气长输管道的注氮施工方法。实践证明,天然气—氮气—空气置换方案是经济可行、安全可靠的方法。

Scenario Optimization and Implementation of Replacement Process for An-ji Natural Gas Long Distance Pipeline

Through the act of assessment, it is concluded that nitrogen replacement can increase the safety of pipeline replacement construction; pig isolation method is not the decisive method to decrease the air-mixed section of the pipeline. Therefore the replacement process scenario for An-ji natural gas long distance pipeline is natural gas-nitrogen-air. The nitrogen-injecting scheme, technological parameters, amount of nitrogen-injecting needed and security measure are illustrated, especially the construction method of nitrogen-injecting. The project practice proves that the replacement scenario of natural gas -nitrogen-air is an economical, feasible, reliable and safe method.