天然气放空是天然气长输管道运行单位生产过程中必不可少的一个环节。对天然气放空时间进行精确量化是管道运行单位值得深入研究的问题。本文对管道内天然气放空时间的计算方法进行研究,找出相应的计算公式。并将所得公式应用于某条管线两阀室间的放空作业,得出的结论对生产调度决策,气量调配,合理计划施工时间,组织事故抢修,从理论上提供了依据。 Natural gas venting is an essential part of the production process of natural gas long-distance pipelines. Accurate quantification of natural gas venting time is a problem worthy of in-depth study on the pipe running unit. In this paper, the method of calculating the venting time of natural gas in pipeline is studied, and the corresponding calculation formula is found out. And the formula is applied to the venting work between two valve rooms of a pipeline. The conclusions obtained provide theoretical basis for decision-making of production scheduling, gas volume allocation, reasonable planning and construction time, and repair of organizational accidents.