带压密封技术在次高压管线法兰泄漏修复应用分析

Application of on-line Sealing Technology in Flange Leakage of Sub-Pressure Gas Network

对于高/次高压门站法兰泄漏采用常规带压动火焊接堵漏技术一般需要停输作业且存在一定安全风险,而采用注剂式带压密封技术可实现在不停输、不泄压、不动火的情况下修复系统泄露部位。文章以上海市天然气管网某连续运行次高压门站法兰泄漏采用注剂式带压密封技术修复实际工程为案例,对注剂式带压密封技术关键部件法兰夹具的设计及计算方法、密封剂材料选择、注剂顺序以及注剂式带压密封技术施工工艺进行总结,为快速、安全、环保、经济的处理法兰泄漏事件提供参考。

For high/sub-high pressure natural gas station, it is a great security concern to stop operating and use the conventional welding technology to repair the flange leakage. However, On-line sealing technology can be used to repair the leakage without stopping operating, reducing pressure, and hot-work. Taking the actual engineering of a continuous sub-high pressure nature gas station in Shanghai, this paper introduces the methods of on-line sealing technology and the proper choice of injecting sealant, summarizes the whole application process,gives us a good reference to deal with flange leakage in a rapid, safe, green and economic way.