大坡度油气管道全自动焊建设工序优化探讨

Discussion on the optimization of the whole engineering process of full automatic pipeline welding in mountainous areas with large slope

随着中国长输管道建设需求的不断提升,长输管道已逐渐向大口径、高钢级方向发展,同时为了满足完整性管理要求,避让城镇规划和基础建设设施,管道进入山区敷设比例越来越高。总结近几年管道失效事故发现,管道失效的主要原因是管道环焊缝的质量问题,而山区管道焊接施工面临地质条件差、施工环境差、施工难度大等挑战,因此在山区管道开展全自动焊推广势在必行。目前已能实现坡度15°下的全自动焊接,但对大坡度(15°<坡度<25°)下的山区管道全自动焊建设尚无应用实例,结合国内长输管道全自动焊建设的发展趋势,对比分析了国内外山区管道全自动焊技术水平现状,并从管道建设全工序出发,针对设计、采购、施工三方面提出了为全面适应大坡度下全自动焊建设应采取的措施。

With the increasing demand of the construction of long-distance pipeline,the long-distance pipeline in China has been gradually developing towards large diameter and high-grade steel.Meanwhile,an increasing proportion of pipelines are being laid in mountainous areas to meet the integrity management requirement and avoid planned urban residential areas and infrastructure facilities.After summarizing the pipeline failure incidents in recent years,it is found that the main cause is the quality of the girth weld.The pipeline welding construction in mountainous areas will face such challenges as poor geological conditions,adverse construction environment and great difficulties in construction.Therefore,it is imperative to promote full automatic welding in mountainous areas.Currently,full automatic welding with slope below 15°can be achieved,but there are no application cases for the construction of full automatic welding of mountain pipelines with large slope(greater than 15°and less than 25°).Based on the development trend of domestic long-distance pipeline automatic welding construction,this paper compares and analyzes the status quo of domestic and international technologies for automatic welding in mountainous area,and puts forward the measures that should be taken to implement full automatic welding construction for pipeline with large slope,covering the whole engineering process of pipeline development in terms of design,procurement and construction.