The maximum capacity of API 650 floating-roof tanks

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

Charpy V-notch specimens shall be taken from the weld metal and from the heat-affected zone of the welding procedure qualification test plates or from duplicate test plates.
Weld metal impact specimens shall be taken across the weld with the notch in the API 620 oil tank material weld metal. The specimen shall be oriented so that the notch is normal to the surface of the material. One face of the specimen shall be substantially parallel to and within 1/16 in. of the surface.