The vapor pressure of liquids stored in API 650 flat-bottom tanks

Standard API 650 tank calls for calculations based on the specific gravity of the liquid product being stored. This permits the thickness of the steel API 650 flat-bottom tanks needed as well as other specifications of how the tank is built to be determined by the weight of the API 650 tank.

Temperature Range: The provisions in this appendix are considered suitable for API 650 flat-bottom tanks design metal temperatures from + 40°F to –60°F, inclusive. In general, refrigerated tank primary components include those components whose failure would result in leakage of the liquid being stored, those exposed to the refrigerated temperature, and those subject to thermal shock. Further definitions of such components are provided in API Standard 620 tank R.1.4.2 and R.1.4.3.

Oil storage tank is an important equipment commonly used in petroleum and petrochemical industry. New API 650 flat-bottom tanks, metal storage tank must be tested before it can be put into use or put into storage. The common inspection methods of API 650 flat-bottom tanks include radiographic testing, ultrasonic testing, magnetic particle testing and dye penetrant testing. The parts and operation requirements of these testing methods are different, so they should be selected according to the required characteristics.

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