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Oil storage tanks play an important role in storing crude oil. Therefore, proper care and its service are important for oil companies. In this regard, knowledge on the state of critical conditions of existing various 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 are discussed for the crack defect. Then, an oil reserve in one of the island states of the country was modeled and was analyzed by considering different types of defects using finite element simulation. Then, critical dimensions of cracks and corrosion holes were identified in a number of cases. Eventually, the Taguchi approach 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 crack and pitting corrosion depth is more than the effect of length and diameter for defects of crack and pitting corrosion, respectively. 

critical size, crack, pitting corrosion, oil storage tank, FEM, Taguchi approach.