摘要
以西一线甘肃段某天然气管线为工程背景,由于土壤长期对管道腐蚀性影响及不良地质作用,含有腐蚀缺陷管道意外产生悬空。利用ASME B31G,DNV RP-F101标准和PCORRC方法对在役含腐蚀坑缺陷悬空管道中允许的腐蚀坑缺陷尺寸进行了确定。基于应变失效准则,建立管道在不同地区的失效判别标准,借助Abaqus有限元分析软件,研究含腐蚀坑缺陷悬空管道的失效位置及腐蚀坑缺陷的长度和深度对管道应力、应变、位移和对管道的安全、极限悬空长度的影响,结果表明,腐蚀缺陷深度系数对管道影响较大,当深度系数k1≥0.4后,管道的安全和极限悬空长度急剧减小,管道极易发生失效。
Taking a segment of Gansu part of West-East Gas Pipeline as the engineering background. Due to the long term impact of soil on the causticity of pipeline and the effects of unfavorable geology,the pipeline with corrosion defects have suspended unexpectedly.Using standard ASME B3 1 G,DNV RP -F101 and PCORRC method on dangling pipeline with corrosion pit containing defects in service to deter-mine allowable corrosion pit defect size.Different parts of the failure criteria is set up by criterion based on the strain failure.With Abaqus,containing corrosion pit defect of suspended pipeline tress,strain,dis-placement,safety and limit suspended length of pipeline on the influence of the depth,length corrosion flaws and failure position is discussed.Results show that the corrosion depth coefficient have a great influ-ence on pipeline.After the depth coefficient k1≥0.4,the safety and limit suspended length of pipeline decreases sharply,pipe prone to failure.
出处
《压力容器》
2015年第1期45-51,56,共8页
Pressure Vessel Technology
关键词
悬空管道
腐蚀缺陷
应变失效准则
深度系数
suspended pipeline
corrosion pit
strain failure
depth coefficient
