Study on the Best Shape of Crude Oil Storage Tank Bottom Corrosion Defect Patching Plate

doi:10.12422/j.issn.1672-6952.2023.05.008

Abstract

Abstract:

In order to determine the reasonable shape of the patching plate for the corrosion defects in the bottom of crude oil storage tank, this paper used finite element analysis to calculate the changes of the stress value in the corrosion defects after repairing different patching plate shapes, and then investigated the stress distribution and the safety factor value of the patching plate, and finally gave the best shape of the patching plate for the bottom of 20 000 m³ crude oil storage tank in Liaohe oil field. The results show that the best shape of the patching plate is a round patching plate. After repairing the corrosion defect, the stress value in the corrosion defect only decreases with the increase of the radius of the patching plate after the repair of the corrosion defect, and does not change with the change of the depth and radius of the defect. With the increase of the radius of the patch plate, the cost and safety of the patch plate will also increase, the specific size of the patch plate should be developed in accordance with the actual situation of the project. The results of the study can give theoretical guidance to the tank bottom repair from a scientific point of view.

Key words: Corrosion defects, Tank bottom, Repair, Finite element

摘要：

为了确定合理的原油储罐罐底腐蚀缺陷的补板形状，利用有限元分析法分析了不同补板形状修补后腐蚀缺陷应力变化情况，并对所用补板的应力分布以及安全系数进行探究，得出了辽河油田2万m³原油储罐罐底的最佳补板形状。结果表明，原油储罐罐底最佳补板形状为圆形补板，对腐蚀缺陷进行修补后，腐蚀缺陷应力随补板半径的增大而减小，不会随腐蚀缺陷深度、半径的变化而变化；随着补板半径的增加，补板的费用和安全性增加，具体补板大小应按照工程实际情况制定。研究结果可以从科学角度对罐底修补给予理论指导。

关键词: 腐蚀缺陷, 储罐罐底, 修补, 有限元

CLC Number:

TE988

Guilin ZHANG, Zhuoyuan LI, Yuguo WU, Dan WANG, Xiaolei WANG. Study on the Best Shape of Crude Oil Storage Tank Bottom Corrosion Defect Patching Plate[J]. Journal of Liaoning Petrochemical University, 2023, 43(5): 50-55.

张贵霖, 李卓远, 吴玉国, 王丹, 王孝磊. 原油储罐罐底腐蚀缺陷最佳补板形状研究[J]. 辽宁石油化工大学学报, 2023, 43(5): 50-55.

Figures/Tables 10

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补板半径/m	补板体积/m³	费用/元	修补后缺陷应力/MPa	修补后安全系数	补板半径/m	补板体积/m³	费用/元	修补后缺陷应力/MPa	修补后安全系数
3.1	0.241 403	7 731.66	5.403 0	13.184 0	3.5	0.307 720	9 855.66	0.165 0	14.843 0
3.2	0.257 229	8 238.52	1.826 0	13.410 0	4.0	0.401 920	12 872.69	0.100 0	14.988 0
3.3	0.273 557	8 761.48	0.724 0	14.182 0	4.5	0.508 680	16 292.00	0.061 0	15.000 0
3.4	0.290 387	9 300.52	0.343 0	14.597 0	5.0	0.628 000	20 113.58	0.045 0	15.000 0

补板半径/m	补板体积/m³	费用/元	修补后缺陷应力/MPa	修补后安全系数	补板半径/m	补板体积/m³	费用/元	修补后缺陷应力/MPa	修补后安全系数
3.1	0.241 403	7 731.66	5.403 0	13.184 0	3.5	0.307 720	9 855.66	0.165 0	14.843 0
3.2	0.257 229	8 238.52	1.826 0	13.410 0	4.0	0.401 920	12 872.69	0.100 0	14.988 0
3.3	0.273 557	8 761.48	0.724 0	14.182 0	4.5	0.508 680	16 292.00	0.061 0	15.000 0
3.4	0.290 387	9 300.52	0.343 0	14.597 0	5.0	0.628 000	20 113.58	0.045 0	15.000 0

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