摘要
现场环焊缝的断裂韧性是保障管道环焊缝安全的重要因素,中国管道环焊缝的断裂韧性主要参照钢管管体焊缝的韧性指标,缺乏理论计算和技术支撑。基于断裂力学原理,采用英国标准BS7910-2013《金属结构裂纹验收评定方法指南》中基于适用性分析的工程临界评估方法,针对中俄东线天然气管道设计工况,通过环焊缝的应力水平和容许极限缺欠尺寸分析,计算得到能够保证焊缝不开裂的临界断裂韧性指标,并结合现行国内外相关标准的规定值,确定中俄东线天然气管道工程的环焊缝冲击功每组3个试样的平均吸收能应为50 J,单个试样的最小吸收能应为38 J。在保证管道环焊缝安全的前提下,降低了现场施工难度,并为今后类似工程环焊缝冲击功的确定提供了指导和借鉴。
The fracture toughness of girth weld is the key factor to ensure its safety. In China, the fracture toughness of pipeline girth weld is mainly determined in reference to the toughness index of steel pipe body weld, without theoretical calculation and technical support at present. Based on the principle of fracture mechanics, the Engineering Critical Assessment（ECA） based on Fitness-for-Service stipulated in the BS 7910-2013 to methods for assessing the acceptability of flaws in metallic structuresis adopted to calculate the critical fracture toughness under which the weld is not fractured in the designed working condition of China-Russia Eastern Gas Pipeline by analyzing the stress and allowable ultimate defect size. Then, based on the values stipulated in current domestic and foreign standards and specifications, it is determined that the average absorption energy of 3 specimens in each group of girth weld impact energy is 50 J, and the minimum value of single specimen is 38 J in the ChinaRussia Eastern Gas Pipeline project. Hence, the on-site construction difficulty is reduced while the safety of pipeline girth weld is guaranteed. The research results provide the guidance and reference for the determination of girth weld impact energy in similar engineering in the future.
作者
周亚薇
张振永
ZHOU Yawei;ZHANG Zhenyong(China Petroleum Pipeline Engineering Co.Ltd（Engineering)
出处
《油气储运》
CAS
北大核心
2018年第10期1174-1179,1191,共7页
Oil & Gas Storage and Transportation
基金
中国石油天然气股份有限公司"十二.五"重大科技专项资助项目"第三代大输量天然气管道关键技术研究"
2012E-2801-01
