API Std 650 aboveground petroleum storage tanks welding symbols

The internal floating plate of internal floating roof tank of API 650 tank is different from that of open floating plate of API Std 650 aboveground petroleum storage tanks External floating roof tank of API 650 tank, so it is impossible to have rain and snow load.

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 Std 650 aboveground petroleum 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.

Generally, the building area temperature of the API Std 650 aboveground petroleum storage tanks should be considered before the tank design and construction. The temperature in the API Std 650 aboveground petroleum storage tanks building area is closely related to the evaporation loss, energy loss, storage tank materials and the selection of detection instruments, or has a direct impact on the storage cost of the storage liquid. For the same medium, the higher the air temperature and the longer the duration, the higher the material temperature in the API Std 650 aboveground petroleum storage tanks, the higher the corresponding pressure and the more volatile loss.

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