摘要
在油气管道设计的应力校核环节,往往关注设计压力、设计温度下的管道应力是否通过校核,而忽略管道交变应力的作用。油气输送管道的疲劳断裂往往是由管道中的各种交变应力引起的,通过综合分析埋地热油管道出、入站典型转角处应力分布规律得出结论:出站90°弯头位置多个截面均承受轴向外拉内压应力;入站90°弯头两侧焊缝位置及弯头不同位置截面多承受外拉内压应力。建议在埋地管道施工时,优化焊接流程,尽量避免在转角处存在短接,减少焊口;有条件的可在管道典型部位布设应变监测传感器,在地面设测试桩,便于评估管道投产后的受力状态。
Stress check in the design of＇oil and gas pipeline often tend to focus on whether the design pressure, design temperature of pipeline stress is checked, but ignore the role oF alternating stress to pipeline, oil and gas transmission pipeline Fatigue fracture is often caused by the pipeline of various alternating stress. Through comprehensive analysis on stress distribution rules of＇buried hot oil pipeline typical corner at the exit or entry station, draw the conclusion： a 90 degree elbow at the exit station is outside the axial compressive stress on the multiple position cross section, a 90 degree elbow at the entry station is outside the axial compressive stress on the both sides ofthe weld position and cross section of＇different positions. Recommended that in the construction of＂ buried pipeline should optimize welding process, as Far as possible to avoid the short joint on the corner, and to reduce welding joint. Deploy the strain sensors in typical position of＇pipeline, set the teat pile on the ground if＇possible, in order to evaluate the stress state of＇the pipeline after commissioning.
出处
《油气田地面工程》
2016年第2期17-21,共5页
Oil-Gas Field Surface Engineering
关键词
热油管道
应力监测
应力分析
疲劳开裂
温度
oil pipeline
stress monitoring
stress analysis
fatigue fracture
temperature
