摘要
近年来,在管道环焊缝隐患治理中,B型套筒修复技术受到广泛应用。然而,B型套筒应用于高强度管道环焊缝缺陷修复时,暴露出套筒几何尺寸不合理、角焊缝延迟开裂等突出问题。为解决B型套筒应用中面临的问题,满足高强度管道环焊缝缺陷修复的需求,研究提出了B型套筒几何尺寸的设计方法及关键参数取值建议;通过专门成分设计及加工工艺技术研究,开发了X65/X70钢级B型套筒,较传统Q345R套筒减重20%~30%,并给出了相应的施焊条件(管输压力及介质流速)、预热温度、焊接方式、焊后热处理等工艺要求,制订了X70钢级B型套筒焊材选用方案;基于套筒角焊缝开裂为延迟裂纹的特点,建议取消根焊和层间磁粉检测,增加焊后超声相控阵检测和48 h后磁粉检测。通过实验室全尺寸试验和现场应用示范验证了X65/X70钢级B型套筒的可靠性,并成功在X80高强度管道环焊缝缺陷修复中推广应用。
In recent years, the repair technology of type-B sleeves has been widely used for the hazard control of pipeline girth welds. However, the prominent problems such as the unreasonable geometrical dimension of sleeve and the delayed cracking of fillet weld are exposed in the girth weld defect repairing of high-strength pipelines with type-B sleeves. In order to solve the problems faced in the application of type-B sleeves and meet the requirements of girth weld defect repair in high-strength pipeline, the design method for geometric dimension of type-B sleeves and the recommendations on value of key parameters were proposed after research. Meanwhile, X65/X70 type-B sleeves were developed through the research on special composition design and processing technology, with the weight about 20%-30% lighter than the traditional Q345R sleeves. Besides, the technical requirements, including the welding conditions(pipeline transportation pressure and flow rate of medium), preheating temperature, welding mode and post-weld heat treatment, were provided, and the selection scheme of welding material for X70 type-B sleeves was put forward. Considering the delayed cracking of sleeve fillet weld, it is suggested to cancel the root welding and the inter-layer magnetic particle detection, add the ultrasonic phased array detection after welding and the magnetic particle detection 48 hours after welding. The reliability of X65/X70 type-B sleeves has been verified by full-scale laboratory test and field application demonstration, and the sleeves have been successfully applied to the repair of girth weld defects of X80 high-strength pipelines.
作者
赵新伟
王高峰
杨锋平
白强
刘迎来
冼国栋
孙宝龙
聂向晖
许彦
ZHAO Xinwei;WANG Gaofeng;YANG Fengping;BAI Qiang;LIU Yinglai;XIAN Guodong;SUN Baolong;NIE Xianghui;XU Yan(CNPC Tubular Goods Research Institute//State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials;PipeChina Southwest Pipeline Company;West East Gas Sub-Company,PipeChina United Pipe Co.Ltd.)
出处
《油气储运》
CAS
北大核心
2022年第10期1141-1149,共9页
Oil & Gas Storage and Transportation
基金
中国石油管道有限责任公司2019年科技计划项目“天然气管道环焊缝修复用B型套筒维抢修关键技术及换管焊接工艺优化研究”,2019E-23-0501。
