API standard 650 SUG I tanks with berm foundations
The thickness of the API standard 650 SUG I tanks annular bottom plates shall be in accordance with Table Q-4 (for steel or aluminum, as applicable). The thicknesses shown are minimums. The ring of annual plates shall have a circular outside circumference, but it may have a regular polygonal shape inside the tank shell with the number of sides equal to the number of annular plates. These pieces shall be butt-welded in accordance with Q.7.1.1, Item b. The plates of the first shell course shall be attached to the annular bottom plates by a weld as required by API 620 oil tank 5.9.5 except when a full-penetration weld is used or required (see Q.7.1.1). Butt-welds in annular plates shall be not closer than 12 in. from any vertical weld.
This standard establishes minimum requirements for API 650 tank material, API standard 650 SUG I tanks design, fabrication, erection, and inspection for ertical. aboveground，closed- and open-top.
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}Strictly control the welding groove forming of API standard 650 SUG I tanks: in order to ensure the geometric dimension of assembly and good welding of welding seam, before hoisting and laying, the edge of all metal vertical storage tank plate shall be polished by grinder, and the flatness of plate shall be ensured according to the design requirements. Strictly control the size of API standard 650 SUG I tanks weld assembly: measures must be taken to strictly control the assembly size of metal vertical tank bottom plate during assembly.
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