论文部分内容阅读
针对国内某长距离通过多年冻土地区管道的选材问题,在经济、技术方案比选的基础上,基于管道的可靠性设计,结合管道的失效原因、失效类型和极限状态分析,对X52、X60钢级的管道抗力进行分析,认为X52钢级、9.5 mm壁厚管道的抗力水平整体明显高于X60钢级、8.7 mm壁厚管道,除抵抗第三方机械挖掘破坏刺穿能力相当外,其他方面的性能优势明显,尤其是极限拉伸应变和压缩应变,分别提高了17%和31%。利用材料、施工和运行维护不确定性参数,采用蒙特卡洛方法,定量计算X52、X60管道在腐蚀和第三方机械挖掘破坏情况下的失效概率水平,结果显示采用X52钢级方案管道失效概率远小于采用X60钢级方案。在费用增加约3.5%的情况下,基于管道的安全可靠性考虑,设计推荐采用X52钢级、壁厚9.5 mm方案。
Aiming at the problem of material selection in some long-distance pipelines in permafrost regions in China, based on the economic and technical options, based on the reliability design of pipelines, combined with the failure reason, failure type and limit state analysis of pipelines, X52, X60 Steel grade pipe resistance analysis, that the X52 steel grade, 9.5 mm wall thickness of the pipe is significantly higher than the overall level of X60 steel grade, 8.7 mm wall thickness of the pipe, in addition to third-party mechanical excavation to break the piercing ability quite the other aspects The performance advantages are obvious, especially the ultimate tensile strain and compressive strain, increased by 17% and 31% respectively. Uncertainty parameters of materials, construction and operation and maintenance, Monte-Carlo method were used to quantitatively calculate the failure probabilities of X52 and X60 pipelines in the case of corrosion and third-party mechanical excavation failure. The results show that the failure probability of pipelines using X52 steel scheme is far Less than the X60 steel grade program. At a cost increase of about 3.5%, based on the safety and reliability of the pipeline, the design recommended X52 steel grade, 9.5 mm wall thickness program.