摘要
针对在营油气管道的抢修改造,研发了塑性短节膨胀阻断管道技术。该技术利用塑性聚四氟乙烯短节的受压膨胀特性,首先在密闭的状态下采用专用切割机具沿管道径向全割下小块整体管段,然后将聚四氟乙烯短节安装到液压顶杆机具上,再将短节径向嵌入割下的原小块整体管段位置,通过顶杆机具压缩聚四氟乙烯短节使之周向膨胀,当短节表面膨胀抵到管段上下切口时,再继续膨胀,使聚四氟乙烯部分嵌入切口,阻断管道上下联通,最终实现对管道的阻断,杜绝油气泄漏。西气东输某阀室引压管改造的实例应用表明:塑性短节膨胀阻断管道技术只需采用一重阻断即达到了改造要求,不必再加装第二重的氮气隔离囊,且阻断效果更佳,极大提高了在营管道维护的安全性和可操作性。
With respect to the rush repair and technical reform of in-service oil and gas pipelines, plastic joint expanding plugging technology is developed. This technology uses the compression expansion characteristic of the plastic PTFE joint. A dedicated cutter is used to cut off small complete pipe sections from the pipeline in the radial direction under the closed condition. The PTFE joint is installed on the hydraulic lift rod machinery and then embedded in the position where small complete pipe sections are cut off. The lift rod machinery is used to compress the PTFE joint so that the PTFE joint follows the circumferential expansion. When the joint surface is expanded to the top and bottom nicks of the pipe section, the expansion will continue and the PTFE part is embedded into the nicks to plug the pipeline to realize the plugging of pipehne. As shown from the results of application in the pressure-induced pipe technical reform in a valve chambers in the West-to- East Gas Pipeline, plastic joint expansion plugging technology can reach technical requirements by using a layer of plugging and provide better plugging effects without installation of nitrogen isolation capsule, which extremely improves the safety and operability of maintenance for in-service pipelines. （1 Table, 5 Figures, 6 References）
出处
《油气储运》
CAS
2013年第7期788-790,共3页
Oil & Gas Storage and Transportation
关键词
油气管道
塑性短节
聚四氟乙烯
膨胀密封
阻断
抢修
oil and gas pipelines
plastic joint
PTFE
expanding seal
plugging
rush repair
