Tanks play an important role in storing crude oil. Therefore, the maintenance and service life of tanks are very important for oil companies. In this regard, knowledge on the state of the critical conditions of various existing defects, such as cracks and pitting corrosion defects, can play an essential role in providing a better service to these huge metal structures. In the present research, the basic theories relating to crack defects were discussed. Then, an oil reserve in one of the island states of the country was modeled and analyzed by considering different types of defects using Finite Element (FE) simulation. Next, the critical dimensions of cracks and corrosion holes were identified in a number of cases. Eventually, the Taguchi Approach (TA) was used to investigate the effect of different parameters related to the various defects, such as length, depth and diameter, on the maximum stress. The results indicated that the effect of the crack and pitting corrosion depth is superior to the effect of the length and diameter for defects of crack and pitting corrosion, respectively.

中文翻译：

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用有限元法和田口法估算储油罐中裂纹和点蚀的临界尺寸

储罐在储存原油中起着重要作用。因此，油箱的维护和使用寿命对石油公司非常重要。在这方面，对各种现有缺陷（例如裂纹和点蚀腐蚀缺陷）的临界条件状态的了解可以在为这些巨大的金属结构提供更好的服务方面发挥至关重要的作用。在本研究中，讨论了与裂纹缺陷有关的基本理论。然后，通过使用有限元（FE）模拟考虑了不同类型的缺陷，对该国一个岛国的石油储量进行了建模和分析。接下来，在许多情况下确定了裂纹和腐蚀孔的临界尺寸。最终，Taguchi方法（TA）用于研究与各种缺陷相关的不同参数的影响，例如长度，深度和直径，取决于最大应力。结果表明，裂纹和点腐蚀深度的影响优于长度和直径对裂纹和点腐蚀的缺陷的影响。