A516 grade 485 plates API Std 650 ground supported flat-bottom tanks
Strictly controlling the temperature in the API Std 650 ground supported flat-bottom tanks can effectively reduce the volatile consumption of oil in large oil storage tanks. Because the higher the temperature in the oil storage tank, the stronger the activity of oil molecules and the greater the volatilization consumption of the oil. Therefore, the temperature in the API Std 650 ground supported flat-bottom tanks must be reduced as much as possible. It is possible to reduce the direct sunlight temperature by painting white anticorrosive paint with good light reflectivity. It is also possible to use spray equipment to wash the top and wall of the API Std 650 ground supported flat-bottom tanks with water flow to reduce the volatilization consumption of the oil in the storage tank.
The opening pressure or vacuum of the pressure relief and API Std 650 ground supported flat-bottom tanks vacuum relief valves shall be checked by pumping air above the water level and releasing the pressure and then partially withdrawing water from the tank. After the tank has been emptied of water and is at atmospheric pressure, the anchorage, if provided, shall be rechecked for tightness against the hold-down brackets. Air pressure, equal to the design pressure, shall be applied to the empty tank, and the anchorage, if provided, and the foundation shall be checked for uplift.
This standard applies only to API 650 tank API Std 650 ground supported flat-bottom tanks whose entire bottom is uniformly supported and to API 650 tank in non-refrigerated service that have a maximum design temperature of 93°C (200 °F) or less.
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