API standard 650 storage tanks impulsive water parameters
API 650 storage tank stipulates that if the thickness of the lower wall panel obtained by calculating the anti-overturning moment is greater than the thickness of the API standard 650 storage tanks hydrostatic pressure test (both do not include the corrosion allowance).
When the day light gradually decreases, the temperature of oil in the API standard 650 storage tanks will also decrease, the evaporation speed will gradually slow down, and the pressure in the API standard 650 storage tanks will also decrease. When the pressure in the API standard 650 storage tanks is lower than the negative pressure rating of the breathing valve, the outside air is sucked into the API standard 650 storage tanks through the open vacuum valve, which is the "suction" process of the oil tank.
The ring of API standard 650 storage tanks annular plates shall have a circular outside circumference, but 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 API Standard 620 R.7.1.1, Item b. The plates of the first shell course shall be attached to the annular bottom plates by welds as required by API Standard 620 5.9.5 except when a full penetration weld is used or required.
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