Cause Analysis and Distribution Law of Weld ECrack in Heat Transfer Oil Pressure Pipeline

LV Zhongjie; ZHANG Zijian; ZHONG Junping; LIN Yuanlong; XU Wubo; XU Lvhang; BAO Yuting

doi:10.7512/j.issn.1001-2303.2023.05.13

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Cause Analysis and Distribution Law of Weld ECrack in Heat Transfer Oil Pressure Pipeline
Vol. 53, Issue 5, Pages: 89-94(2023)
DOI： 10.7512/j.issn.1001-2303.2023.05.13

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吕钟杰，张子健，钟军平，等.导热油压力管道焊缝裂纹产生原因分析与分布规律研究［J］.电焊机，2023，53（5）：89-94.

LV Zhongjie, ZHANG Zijian, ZHONG Junping, et al.Cause Analysis and Distribution Law of Weld ECrack in Heat Transfer Oil Pressure Pipeline[J].Electric Welding Machine, 2023, 53(5): 89-94.
吕钟杰，张子健，钟军平，等.导热油压力管道焊缝裂纹产生原因分析与分布规律研究［J］.电焊机，2023，53（5）：89-94. DOI： 10.7512/j.issn.1001-2303.2023.05.13.

LV Zhongjie, ZHANG Zijian, ZHONG Junping, et al.Cause Analysis and Distribution Law of Weld ECrack in Heat Transfer Oil Pressure Pipeline[J].Electric Welding Machine, 2023, 53(5): 89-94. DOI： 10.7512/j.issn.1001-2303.2023.05.13.

摘要

在压力管道的定期检验实践中发现，导热油管道的焊缝中经常会检出裂纹，且含有裂纹的焊缝分布位置通常比较典型。采用热应力理论、挠度理论，并辅以焊缝缺陷的无损检测，对典型含缺陷管道焊缝的裂纹成因进行分析。分析得到，此类管道运行温度高，在未合理设置固定支座进行分段吸收管道热膨胀的情况下，管道将以较大的位移进行热膨胀，造成相邻两固定约束点之间的热应力过高；在走向连续改变且支撑不良的情况下，两相邻固定支座之间的中间管段因其弹性大，变形量大，其内部应力水平比其他部位管段要高；当焊口中存在未熔合、未焊透等焊接缺陷时，因几何不连续会形成明显的应力集中，缺陷的尖端极易成为裂纹源。

Abstract

In the practice of regular inspection of pressure pipelines, it is found that cracks are often detected in the welds of heat transfer oil pipelines, and the distribution of welds containing cracks is usually typical. In this study, thermal stress theory, deflection theory, supplemented by non-destructive testing of weld defects, are used to analyze the cracks of typical pipeline welds with defects. The analysis shows that the operating temperature of this type of pipeline is high. If the fixed support is not properly set up to absorb the thermal expansion of the pipeline in sections, the pipeline will thermally expand with a large displacement, resulting in excessive thermal stress between two adjacent fixed constraint points. High; in the case of continuous change in direction and poor support, the internal stress level of the intermediate pipe section between two adjacent fixed supports is higher than that of other pipe sections due to its large elasticity and large deformation; when there is unfused , Incomplete penetration and other welding defects, obvious stress concentration will be formed due to geometric discontinuity, and the tip of the defect can easily become the source of cracks..

关键词

压力管道固定支座热应力焊接裂纹分布规律

Keywords

pressure pipelinefixed supportthermal stresswelded crackdistribution law

references

濮宇凌，郑智阳，张淑文.导热油管道安全设计时易忽视问题的探讨［J］. 化工与医药工程， 2018，39（01）：23-26.

PU Y L， ZHENG Z Y， ZHANG S W. Discussion on Neglectable Issues in Safety Design of Thermal Oil Pipelines［J］. Chemical and Pharmaceutical Engineering， 2018，39（01）： 23-26

孙颖，吕超.基于有限元的输气管道热应力及影响因素分析［J］. 西华大学学报（自然科学版）， 2018， 37（02）： 19-22+45.

SUN Y， LV C. Analysis of thermal stress and influencing factors in gas pipelines based on finite element method［J］ Journal of Xihua University （Natural Science Edition）， 2018， 37（02）： 19-22+45

陆树华，唐夏焘，叶宇峰，等.基于X射线数字成像检测技术的高温导热油管道焊缝缺陷研究［J］.中国化工装备，2022，24（01）：3-5.

LU S H， TANG X T， YE Y F， et al. Research on weld defects in high-temperature thermal oil pipelines based on X-ray digital imaging detection technology［J］. China Chemical Equipment， 2022，24（01）： 3-5

卢夺，付艳波. 溶脱装置导热油管道系统应力分析［J］.化工设备与管道，2021，58（06）：64-67.

LU D， FU Y B. Stress Analysis of Heat Conducting Oil Pipeline System in Dissolution Device［J］. Chemical Equipment and Pipeline， 2021，58（06）： 64-67.

逯云玲，王浩丽，杜廷栋.管廊上导热油管道反向π弯的设置分析［J］.山东化工，2021，50（08）：172-174.

LU Y L， WANG H L， DU T D. Analysis of reverse π bending of thermal oil pipelines on pipe galleries［J］. Shandong Chemical Industry， 2021，50（08）： 172-174.

王方军，王东哲，万红，等.热处理和冷变形量对定膨胀合金4J32C线膨胀系数的影响［J］.金属热处理，2022，47（04）：199-203.

WANG F J， WANG D Z， WAN H， et al. The effect of heat treatment and cold deformation on the linear expansion coefficient of constant expansion alloy 4J32C［J］. Metal Heat Treatment， 2022，47（04）： 199-203.

尚建路，孙志强，刘炜等.热网管失效原因分析［J/OL］.热加工工艺，2023（13）：160-162.

SHANG J L， SUN Z Q， LIU W， et al. Cause Analysis of Thermal Network Pipe Failure［J/OL］. Hot Working Process， 2023（13）： 160-162.

郑津洋，桑芝富. 过程设备设计［M］. 北京：化学工业出版社， 2020.

GB/T 20801.3-2020，压力管道规范工业管道第3部分：设计和计算［S］.

苏林，马雪莉，崔德荣，等. 基于周向励磁的管道缺陷漏磁信号仿真分析［J］. 电焊机， 2022， 52（3）：20-28.

SU L， MA X L， CUI D R， et al. Simulation of Magnetic Flux Leakage Signal of Pipeline Defect Based on Circumferential Excitation［J］. Electric Welding Machine， 2022， 52（3）： 20-28.

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