西气东输三线国产大口径阀门内漏分析与控制

Analysis and control for internal leakage of domestic large-diameter valve used in the 3rd West-to-East Gas Pipeline

国产大口径阀门在西气东输三线工程中得到大量应用,但阀门"跑、冒、滴、漏"现象时有发生,给管道运行和维检修带来重大安全隐患。油气管道工程建设中,阀门内漏控制是工程质量管理的重点。以阀门解体试验为基础,结合数据统计分析,考虑地理位置和自然环境等因素,从阀门本体结构、质量检验和施工管理等环节入手,查找出阀门内漏的2个通道。针对内漏具体情况和严重程度,制定出堵塞2个内漏通道的具体措施,明确了阀门在设计、制造、检验、运输和维护保养各环节的注意事项,有效控制阀门内漏,使工程质量得以提升。

The domestic large-diameter valves have been widely used in the 3rd West-to-East Gas Pipeline. However, valve blowing, puffing, dripping and leakage occur frequently, heavily threatening the pipeline operation and maintenance. For oil and gas pipeline engineering constructions, control of valve internal leakage is a top priority in engineering quality control. In this paper, two internal leakage paths of valves are identified in terms of their body structures, quality inspection and construction management on the basis of data statistics and analysis, as well as geographic locations and natural environments, after disassembly experiments are performed on the valves. Considering the specific situations and degrees of the internal leakage, the plugging measures for the two internal leakage paths are made out. Moreover, the considerations are confirmed for the design, production, inspection, transportation and maintenance of valves. In this way, the valve internal leakage is controlled effectively, and the engineering quality is promoted. （3 Figures, 10 References）