API standard 650 low-alloy steel tanks grade

Compared with the fixed roof API 650 oil storage tank without API standard 650 low-alloy steel tanks floating roof, there is no evaporation space. In principle, this eliminates the so-called "large breathing loss". Evaporation not only causes the loss of product quantity, but also affects the quality of API standard 650 low-alloy steel tanks product and pollutes the environment.

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 low-alloy steel 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.

Usually, the wind load in the API standard 650 low-alloy steel tanks construction area should be considered before the tank design and construction. The wind load in the API standard 650 low-alloy steel tanks construction area has an impact on the stability and economy of the API standard 650 low-alloy steel tanks. In the area with large wind load, it is safe to design the tank as "squat". When calculating the wind force, the influence of the thickness of the insulation layer of the API standard 650 low-alloy steel tanks, the shape of the ladder, the platform, the pipeline and the top cover must be considered.

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