API standard 650 aboveground welded storage tanks self-anchored

Shell Stiffening Rings for Tanks That Contain Liquid
Internal or external shell stiffening rings may be required to maintain roundness when the tank is subjected to wind, vacuum, or other specified loads. When API standard 650 aboveground welded storage tanks stiffening rings are required, the stiffener-to-shell weld details shall be in accordance with Figure Q-1 and Q.3.5.2 through Q.3.5.5.
Three-plate laps or butt-weld junctions in tank bottoms shall be not closer than 12 in. from each other or from the butt-welds of the annular plates.
Bottom plates, other than annular bottom plates for a 9% or 5% nickel steel or stainless steel tank that contains liquid, may have a minimum thickness of 3/16 in. exclusive of any specified corrosion allowance.

Welded steel API standard 650 aboveground welded storage tanks storage tanks that are designed, manufactured and installed on the ground are classified according to the API standard system. The three API standards API standard 650 aboveground welded storage tanks all adopt on-site production and installation of storage tanks.

Generally speaking, the duration of the "exhalation" of the API standard 650 aboveground welded storage tanks is longer than that of the "inhalation" of the API standard 650 aboveground welded storage tanks every day. There are many factors affecting the "small breathing" loss, mainly including the following points: the change of temperature difference between day and night, sunshine time of the API standard 650 aboveground welded storage tanks location, open area of the API standard 650 aboveground welded storage tanks, atmospheric pressure, filling degree of API standard 650 aboveground welded storage tanks, etc. When the API standard 650 aboveground welded storage tanks is full of gas, the space volume is small, and the "small breathing" loss is less; if the space volume is large, the loss is also large.