Copper-bearing steel sheets API Std 650 stainless steel storage tanks

API 650 external floating roof storage tanks are generally called external floating roof API Std 650 stainless steel storage tanks tanks, which means that the storage tanks are externally open tanks without a dome design, and are equipped with vertical floating roofs. API 650 external floating roof storage tanks are usually used for large More than 20,000 cubic meters of open steel API Std 650 stainless steel storage tanks storage tanks for storing volatile petroleum products such as crude oil, gasoline, kerosene, etc.

Usually, the wind load in the API Std 650 stainless steel storage tanks construction area should be considered before the tank design and construction. The wind load in the API Std 650 stainless steel storage tanks construction area has an impact on the stability and economy of the API Std 650 stainless steel storage 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 Std 650 stainless steel storage tanks, the shape of the ladder, the platform, the pipeline and the top cover must be considered.

Soil Structure Interaction: Soil structure interaction per API 650, Section E.6.1.6 may be used for OLE design providing the damping ratio does not exceed 10 %.
Allowable Stresses
Design allowable stresses shall be per API 620 large welded steel storage tank, Section Q.3.3, including the 33 % increase permitted for earthquake loads.
Self-anchored Inner Tank
The anchorage ratio for a self-anchored inner tank, J, shall not exceed 1.0 for the OLE design combination to limit uplift and stresses in the annular plate and corner weld.
Foundation Stability
The overturning ratio defined in API 650, Section E.6.2.3, Equation (E.6.2.3-1) shall be equal to or greater than 3.0 for the defined OLE event.

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