Strength Analysis and Remaining Life Estimation of Storage Tank Based on API 650 & 653

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Strength and remaining life of a storage tank was evaluated based on API 650/653 standard code. The tank was a vertical-cylindrical tank with a diameter of 29 meters and maximum capacity of 4,719 m3. The actual thickness of the shells of the tank were measured using ultrasonic testing. The finite element code ANSYS Workbench 2023 was used to perform the static stress analysis of the 3D model of the tank. The results show that the maximum equivalent stress was within the allowable stress of the material, hence the tank was considered safe based on API 650. The remaining life of the tank was then evaluated based on API 653. The critical section was found in the 2nd course of the tank shell with a remaining life of 22.5 years.

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February 2026

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