API 650 SUG I tanks welding symbols

Compared with the fixed roof API 650 oil storage tank without API 650 SUG I 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 SUG I tanks product and pollutes the environment.

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

The horizontal projection of the roof plate within the compression-ring region is 4.9 x 0.866 = 4.25 in., which fulfills the requirement of API 620 tank standard 5.12.5.1. The required area and horizontal projection can be provided by any of the standard angles listed in Table F-3.
Any of these angles may be used in accordance with the details of Figure 5-6, detail a or b, but if details c, h, or i in Figure 5-6 were intended, the net area of the angle must be calculated by deducting the area expected to be lost by corrosion from that part of the angle surface that is exposed to the interior of the tank.

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