API standard 650 open top welded storage tanks shell-plate

The API Std 650 standard published by the American Petroleum Institute (API) is designed to provide the petroleum industry with welded steel tanks for use in the API standard 650 open top welded storage tanks storage of petroleum products and other liquid products commonly handled and stored by the various branches of the petroleum industry.

Tank cracks are common API standard 650 open top welded 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 standard 650 open top welded storage tanks construction, which become obvious after the later use. Or in the process of using the API standard 650 open top welded storage tanks, the tank body material generated new defects due to corrosion, pressure, wear and other reasons, and tank cracks.

When as-rolled plate material complies with impact test requirements as specified here, the material need not be normalized. If, as with ASTM A516, the specification prohibits impact test without normalizing but otherwise permits as-rolled plates, the API 620 welded storage tanks material may be ordered in accordance with the above provision and identified as “MOD” for this API modification.

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