API 650 flat-bottom tanks dead load

Compared with the fixed roof API 650 oil storage tank without API 650 flat-bottom 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 650 flat-bottom tanks product and pollutes the environment.

Any joints between the adjacent sections of API 620 oil storage tank stiffening rings, as shown in Figure Q-1, shall be made so that the required moment of inertia of the combined ring-shell section is provided. Weld joints between adjacent sections shall be made with full-thickness and full-penetration butt-welds. Stiffening-ring butt-welds may employ metal backing strips. Backing strips and the associated welding shall be made in a manner that provides a smooth contour in the rat hole and all other weld joint ends. All weld passes shall be started at the rat hole and other weld joint ends and shall be completed by moving away from these ends. Passes shall be overlapped away from edges to provide a smooth continuous weld.

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

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