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由于管内天然气的不断冲刷，温度、压力、振动、季节变化，地质变化，人为等因素的影响，使天然气输送管道不可避免地会发生密封失效的问题，如不及时处理，密封失效的程度将会扩大，导致天然气大量泄漏，造成能源物料流失、污染环境，重则引起火灾、爆炸、中毒、伤亡等恶性事故，严重威胁着天然气输送管道正常运行。因此，泄漏的预防及在动态条件下及时有效地消除泄漏是天然气管道输送管理工作的重要内容。文章分析了天然气输送管道中生产泄漏的原因，介绍了在不影响正常操作的条件下，消除泄漏的动态密封技术，论述了天然气输送管道上法兰泄漏、直管泄漏、三通泄漏、弯头泄漏及填料泄漏的具体消除手段。

Natural Gas Pipeline Leaking Analysis and Dynamic Disposal Technique

The seal failure will unavoidably happen in natural gas transmission pipeline because of the influences of the gas' scouring unceasingly,the changes in temperature,pressure and vibration,the seasonal variation,the geological condition change and the human factor,etc.If it isn't disposed in time,the seal failure will be getting more and more serious,leading to a great deal of natureal gas' being leaked,which causes energy material loss,environmental pollution,even arouses a malignant accident as fire,explosion,poisoning or fatality,a normal natural gas transmission pipeline operation being seriously threatened.Therefore it is an important substance of gas transmission pipeline management to prevent gas leaking and eliminate it in time and effectively under a dynamic condition.The reasons of forming gas leaking in natural gas transmission pipeline are analyzed,a dynamic seal technique of eliminating gas leaking under the condition of uninfluencing normal operation is introduced and some concrete measures of eliminating the leakings at the flange,straight pipe,straight tee,elbow and packing loction of the natural gas pipeline are stated in the paper.