相邻腐蚀缺陷间相互作用规律及其对管道失效压力的影响  

Interaction rule between adjacent corroded defects and its effect on failure pressure of pipeline

作　　者：熊道英 张怡[2,3] 王垚 帅义 帅健 高唯[2,3] XIONG Daoying;ZHANG Yi;WANG Yao;SHUAI Yi;SHUAI Jian;GAO Wei(South China Branch of National Oil and Gas Pipeline Network Group,Shenzhen 518000,China;College of Safety and Ocean Engineering,China University of Petroleum,Beijing 102249,China;Key Laboratory of Oil and Gas Safety and Emergency Technology,Ministry of Emergency Management,Beijing 102249,China)

机构地区：[1]国家石油天然气管网集团华南分公司,广东深圳518000 [2]中国石油大学(北京)安全与海洋工程学院,北京102249 [3]应急管理部油气生产安全与应急技术重点实验室,北京102249

出　　处：《压力容器》2024年第9期55-67,共13页Pressure Vessel Technology

基　　金：国家重点研发计划项目(2022YFC3004802-4);国家自然科学基金项目(52204071);中国石油大学(北京)优秀青年学者科学基金项目(2462023QNXZ006)。

摘　　要：针对长输管道腐蚀缺陷位置分布随机性强、缺陷以群落表征的特点,建立对称与非对称双缺陷管道的有限元模型,研究轴向与环向排列的双缺陷间相互作用及其对管道失效压力的影响,确定缺陷尺寸及间距对不同排列缺陷下管道失效压力的影响,提出了适用于非对称缺陷的缺陷间相互作用准则。结果表明,轴向排列缺陷与深度不同的环向排列缺陷,其缺陷间相互作用均随缺陷间距增加呈非线性增长趋势;而对于深度相同的环向排列缺陷,其缺陷间相互作用随缺陷间距增加,先减小、后上升,且在环向间距为0.01πD时取得最小值;非对称缺陷间相互作用一般要弱于对称缺陷,且非对称缺陷下的管道失效压力一般由腐蚀程度较严重缺陷决定;缺陷间轴向相互作用距离由缺陷长度决定,长度增加会缩减缺陷间轴向相互作用极限距离,当缺陷长度超出8.36√Dt时,可以忽略缺陷间相互作用;确定相邻缺陷环向相互作用极限距离为0.18πD。该研究为存在相互作用缺陷管道的失效压力评估提供了一种新方法。In view of the characteristics of strong randomness of corrosion defect location distribution and community characterization of defects in long-distance pipelines,the finite element models of symmetrical and asymmetrical double-defect pipelines were established.The interaction between double defects arranged axially and circumferentially and its influence on pipeline failure pressure were investigated.The influences of defect size and spacing on pipeline failure pressure under different arrangements of defects were determined,and the interaction criterion between defects suitable for asymmetric defects was proposed.The results show that the interaction between longitudinally aligned defects and circumferentially aligned defects with different depths increases nonlinearly with the increase of defect spacing.For circumferentially aligned defects with the same depth,the interaction between defects decreases first and then increases with the increase of defect spacing,and the minimum value is obtained when the circumferential spacing is 0.01πD.The interaction between asymmetric defects is generally weaker than that of symmetric defects,and the failure pressure of pipeline for asymmetric defects is determined by the serious corrosion defect.The axial interaction distance between defects is determined by the defect length.The increase of the length will reduce the axial interaction limit distance between defects.When the defect length exceeds 8.36 Dt,the interaction between defects can be ignored.The limit distance of the circumferential interaction between adjacent defects equals to 0.18√πD.This study provides a new method for evaluating the failure pressure of pipelines with interaction defects.

关 键 词：管道 双缺陷 有限元模型 相互作用准则 失效压力 

分 类 号：TH49[机械工程—机械制造及自动化] TE973[石油与天然气工程—石油机械设备] TQ050.9[化学工程]