API Std 650 ambient temperature tanks size

The vent pipe mouth should be 4m or more above the ground. The nominal diameter of the API Std 650 ambient temperature tanks API 650 petroleum storage tank vent pipe should be no less than 50mm and a flame arrestor should be installed.

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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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