21m diameter API Std 650 anchored liquid-storage tanks

Welding certification is regulated by Section 10 of the American Society of Mechanical Engineers (ASME). For both API Std 650 anchored liquid-storage tanks storage tank API 650, non-destructive inspection is required, but third-party inspection is not required.

Oil tank is often used to store crude oil, diesel oil, gasoline and other oil. The main structure of API Std 650 anchored liquid-storage tanks is composed of tank top, tank wall, tank bottom and accessories. The API Std 650 anchored liquid-storage tanks should be inspected after the completion of construction, and the detection methods of different structure positions are different. Tank wall inspection: for the newly built oil tank, water filling test shall be conducted to check whether the tank wall is tight, and the appearance inspection shall be conducted for the tank wall plate and weld. Tank wall thickness detection: the oil tank wall thickness is mainly detected by ultrasonic wave, with high efficiency.

Any joints between the adjacent sections of API 620 oil storage tank stiffening rings, as shown in Figure Q-1, shall be made so that the required moment of inertia of the combined ring-shell section is provided. Weld joints between adjacent sections shall be made with full-thickness and full-penetration butt-welds. Stiffening-ring butt-welds may employ metal backing strips. Backing strips and the associated welding shall be made in a manner that provides a smooth contour in the rat hole and all other weld joint ends. All weld passes shall be started at the rat hole and other weld joint ends and shall be completed by moving away from these ends. Passes shall be overlapped away from edges to provide a smooth continuous weld.

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