API Std 650 partially anchored liquid-storage tanks horizontal shell joints

The API Std 650 standard published by the American Petroleum Institute (API) is designed to provide the petroleum industry with welded steel tanks for use in the API Std 650 partially anchored liquid-storage tanks storage of petroleum products and other liquid products commonly handled and stored by the various branches of the petroleum industry.

When the day light gradually decreases, the temperature of oil in the API Std 650 partially anchored liquid-storage tanks will also decrease, the evaporation speed will gradually slow down, and the pressure in the API Std 650 partially anchored liquid-storage tanks will also decrease. When the pressure in the API Std 650 partially anchored liquid-storage tanks is lower than the negative pressure rating of the breathing valve, the outside air is sucked into the API Std 650 partially anchored liquid-storage tanks through the open vacuum valve, which is the "suction" process of the oil tank.

The density of the liquid API 620 large welded, low pressure storage tanks stored shall be its maximum density within the range of design temperatures, but no less than 36 lbf/ft3. The maximum allowable tensile stress shall be taken from Table 5-1 or Table Q-3. For the maximum allowable stresses for design loading combined with wind or earthquake loads, see API Standard 620 5.5.6 for carbon steel and Q.3.3.5 for stainless steel and aluminum.

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