aluminum sheet 5086 API Std 650 fixed roof tanks
This standard establishes minimum requirements for API 650 tank material, API Std 650 Fixed roof tanks design, fabrication, erection, and inspection for ertical. aboveground，closed- and open-top.
Tank cracks are common API Std 650 fixed roof 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 fixed roof tanks construction, which become obvious after the later use. Or in the process of using the API Std 650 fixed roof tanks, the tank body material generated new defects due to corrosion, pressure, wear and other reasons, and tank cracks.
The {keyword shell that contains the liquid shall have butt-welded annular bottom plates with a radial width that provides at least 24 in. between the inside of the shell and any lap-welded joint in the remainder of the bottom and at least a 2-in. projection outside the shell. The stated values apply to full-sized specimens. For sub-size specimen acceptance criteria, see ASTM A20. An impact test temperature lower than the design metal temperature may be used by the API 620 large welded, low pressure storage tanks Manufacturer.
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