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[1]刘玉卿张振永吴圣思季蓓蕾张宏刘啸奔.水网地区大口径X80管道环焊缝安全评价[J].油气储运,2023,42(10):1-13.
　LIU Yuqing,ZHANG Zhenyong,WU Shengsi,et al.Safety Assessment of Girth Welds of Large Diameter X80 Pipelines in Water Network Area[J].Oil & Gas Storage and Transportation,2023,42(10):1-13.

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水网地区大口径X80管道环焊缝安全评价

《油气储运》[ISSN:1000-8241/CN:13-1093/TE] 卷: 42 期数: 2023年10期页码: 1-13 栏目: 出版日期: 2023-10-25

Title:: Safety Assessment of Girth Welds of Large Diameter X80 Pipelines in Water Network Area

作者:: 刘玉卿张振永吴圣思季蓓蕾张宏刘啸奔; 1. 中国石油天然气管道工程有限公司；2. 中国石油大学（北京）·油气管道输送安全国家工程实验室·石油工程教育部重点实验室·城市油气输配技术北京市重点实验室；

Author(s):: LIU Yuqing; ZHANG Zhenyong; WU Shengsi; JI Beilei; ZHANG Hong; LIU Xiaoben; 1. China Petroleum Pipeline Research Institute, National Engineering Laboratory for Pipeline Safety, Hebei Langfang 065000;

2. National Engineering Laboratory for Pipeline Safety, MOE Key Laboratory of Petroleum Engineering, Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum-Beijing, Beijing 102249;

关键词:: 水网地区; 环焊缝; 有限元分析; FAD图; 适用性评价

Keywords:: Water network area; girth weld; finite element analysis; FAD diagram; applicability evaluation

分类号:: TE88

文献标志码:: A

摘要:: 水网地区土壤含水量大，土质松软，极易发生沉降，管道在沉降作用下受到轴向载荷的作用，受拉伸载荷作用的环焊缝具有较高的失效风险。为保障管道的本质安全，针对水网地区直径1 422 mm X80管道，采用非线性有限元方法建立了突变型软土沉降下管道轴向应力应变数值计算模型，得到了最危险的突变型沉降工况下不同软土沉降位移对管道轴向载荷大小与分布的影响。在此基础上，采用BS 7910-2019《金属结构中缺陷可接受性评定方法导则》对软土沉降区不同位置管道焊缝的安全性进行评价，分析外部载荷条件及焊缝错边的影响，发现错边量增加将导致评估所用载荷比与韧性比增大，管道安全保守性降低。在临界断裂韧性CTOD值取现有准则0.25 mm的条件下，采用一级评估曲线，水网地区X80管道焊缝始终处于安全状态。若采用二级评估曲线，当临界断裂韧性CTOD值减小至0.08 mm，沉降位移取最大值1 m时，X80管道焊缝处于安全临界状态。

Abstract:: The water content of the soil in the water network area is large, the soil is soft, and settlement is easy. The pipeline is subjected to axial load under the action of settlement, and the girth weld under the action of tensile load has a higher risk of failure. In order to ensure the intrinsic safety of the pipeline, this study used a nonlinear finite element method to establish a numerical calculation model for the axial stress and strain of the pipeline under abrupt soft soil settlement for the 1422mm X80 pipeline in the water network area, and obtained the most dangerous abrupt settlement. The influence of the settlement displacement of different soft soils on the size and distribution of the axial load of the pipeline under different conditions. On this basis, the BS 7910-2019 Guide to methods for assessingthe acceptability of fl aws inmetallic structures was used to evaluate the safety of pipeline welds at different locations in the soft soil settlement area. Through the analysis of the influence of external load conditions and weld misalignment, the increase in the amount of misalignment leads to an increase in the load ratio and toughness ratio used in the evaluation, and the safety and conservativeness of the pipeline is reduced, but the critical crack tip opening displacement is taken as the existing standard 0.25mm Under the conditions, the first-level evaluation curve is adopted, and the welds of the X80 pipeline in the water network area are always in a safe state. If the second-level evaluation curve is used, when the critical crack tip opening displacement is reduced to 0.08mm and the settlement displacement takes the maximum value of 1m, the X80 pipeline weld is in a safe critical state.

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更新日期/Last Update: 2023-08-28