ISO 630 Gr E355 plates API 650 storage tanks
API 650 external floating roof storage tanks are generally called external floating roof API 650 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 650 storage tanks storage tanks for storing volatile petroleum products such as crude oil, gasoline, kerosene, etc.
Usually, the wind load in the API 650 storage tanks construction area should be considered before the tank design and construction. The wind load in the API 650 storage tanks construction area has an impact on the stability and economy of the API 650 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 650 storage tanks, the shape of the ladder, the platform, the pipeline and the top cover must be considered.
Except as permitted by API standard 620 Q.8.6, the test shall be conducted after the entire tank is complete, before the insulation is applied. Except as limited by foundation or stress conditions, the test shall consist of filling the tank with water to the design liquid level and applying an overload air pressure of 1.25 times the pressure for which the vapor space is designed. The load on the supporting foundation shall preferably not exceed the established allowable bearing value for the tank site. Where a thorough evaluation of the foundation justifies a temporary increase, the established allowable bearing may be increased for the test condition, but the increase shall be not more than 25%.
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