API Std 650 aboveground petroleum storage tanks overturning stability

Tank cracks are common API Std 650 aboveground petroleum storage tanks defects, mainly including tank wall cracks, internal cracks, weld zone cracks. The reason for these defects may be that the defects not exceeding the standard existed in the early stage of API Std 650 aboveground petroleum storage tanks construction, which become obvious after the later use. Or in the process of using the API Std 650 aboveground petroleum storage tanks, the tank body material generated new defects due to corrosion, pressure, wear and other reasons, and tank cracks.

Materials for API Std 650 aboveground petroleum storage tanks primary components shall comply with the requirements of Tables R-1 and R-2. All primary components shall be impact tested in accordance with R.2.1.2 through R.2.1.4. Impact testing of API 620 welded storage tanks plates, including structural members made of plate, shall comply with Table R-1. Impact test specimens shall be taken transverse to the direction of final plate rolling.

The calculated thickness of the above-mentioned wall panels required by the hydrostatic pressure is also It API Std 650 aboveground petroleum storage tanks should be increased by the same ratio, unless special analysis is performed to determine the seismic overturning moment and the corresponding stress at the bottom of the wall of each layer of API 650 tank.

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