API standard 650 welded steel storage tanks limitations

The factors that affect the "small breathing" loss of API standard 650 welded steel storage tanks are: 1. Generally, the larger the storage tank is, the larger the total open area is, the larger the evaporation area is, and the greater the "small breathing" loss is; conversely, the smaller the storage tank is, the smaller the evaporation area is and the smaller the "small breathing" loss is. 2. It is related to the atmosphere. The lower the atmospheric pressure is, the greater the "small breathing" loss is; otherwise, the loss is reduced.

refrigerated tanks secondary components are those whose failure would not result in leakage of the liquid being stored. Secondary components also include those API standard 650 welded steel storage tanks components that are not in contact with the refrigerated liquid but are subject to the refrigerated temperature vapors and have a combined tensile and primary bending stress under design conditions that does not exceed 6000 lbf/in.2. Secondary components that could be designed within this reduced stress are roof plates, including roof manways and nozzles with their reinforcement, roof-supporting structural members, and shell stiffeners.

This standard establishes minimum requirements for API 650 tank material, API standard 650 welded steel storage tanks design, fabrication, erection, and inspection for ertical. aboveground，closed- and open-top.

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