API 650 stainless and carbon steel tank roof deck

Under the action of the earthquake, API 650 storage tank is mainly damaged by the phenomenon of the lower part of the API 650 stainless and carbon steel tank tank wall. Therefore, the key point of seismic calculation is to prevent the tank wall from buckling under axial pressure.

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 650 stainless and carbon steel tank 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.

The water dissolved in the oil will be separated out from the oil stored in the API 650 stainless and carbon steel tank for a long time, and the acidic water layer will appear at the bottom of the API 650 stainless and carbon steel tank for a long time, which will accelerate the corrosion of the API 650 stainless and carbon steel tank and cause the wall thinning and even leakage. With the increase of service life, the API 650 stainless and carbon steel tank must be inspected and cleaned regularly to check the hidden danger.

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