摘要
非金属缠绕管道修复是在役管道受损后的一种主要修复方式,对于保障油气管道的平稳安全运行具有十分重要的意义。基于组合薄壁圆筒的力学分析理论,推导出了管道修复厚度的计算公式,并考虑缠绕材料的各向异性建立了缠绕修复管道的有限元分析模型。分析结果表明,缠绕层对附近管体的应力状态影响不大,只要修复厚度和修复长度合适,就能够完全恢复管道的承压能力。缠绕层在管道缺陷区域屈服以后能起到明显的承载作用。增大缠绕层厚度,可降低管道和缠绕层中的环向应力;而当缠绕层厚度小于最小修复厚度时,即使加大修复长度也无法完全恢复管道的承压能力。最后,对基于有限元法和解析方法得到的缠绕层厚度和长度进行了对比,结果表明,缠绕层厚度的计算公式偏于安全,可用于管道修复缠绕层的设计计算。
The rehabilitation technique of pipelines by enwinding non-metallic materials is a major repair way for the pipeline damaged in service,and it has great significance in ensuring smooth and safe operation for oil and gas pipelines.The mechanical theory on the combination of thin-walled cylinders was applied to deduce a formula for calculating the thickness of the enwinding layer,and a finite element analysis model of pipelines repaired by enwinding non-metallic materials was established based on the consideration of the anisotropy of enwinding materials.The result showed that the enwinding layer has little effect on the stress state of the adjacent pipe section,the loading capacity of the repaired pipeline can be fully recovered as long as the repair thickness and length are suitable.The enwinding layer can play an obvious role in bearing pressure after the pipe defect region yields.Increasing the repair thickness can reduce the hoop stress of both the pipe and the enwinding layer,however,when the enwinding layer thickness is less than the minimum repair thickness,the loading capacity of pipeline cannot be fully restored even the repair length is increased.Finally,the calculation results of the thickness and length of the enwinding layer based on the finite element method and analytical method were compared,which indicates that the calculating formula for the enwinding thickness lays emphasis on safety,and can be used to calculate the enwinding layer in pipeline rehabilitation design.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2013年第2期372-379,共8页
Acta Petrolei Sinica
基金
国家重大科技专项(2011ZX05017-004-HZ04)资助
关键词
油气管道
缠绕层
力学分析
有限元分析
修复
oil and gas pipeline
enwinding layer
mechanical analysis
finite element analysis
repair
