API Std 650 fixed roof tanks with heavy or tall shells
Generally, the snow load in the API Std 650 Fixed roof tanks construction area should be considered before the design and construction of the tank. The snow load in the API Std 650 fixed roof tanks construction area has an impact on the tank roof design and operation, especially in the area with large snow load, the roof load of large storage tank with large diameter increases. Anti freezing, heat preservation and waterproof measures shall be taken for the additional facilities of storage tanks, such as pumps, breathing valves, flame arresters, detection instruments and thermal insulation layers.
API 620 crude oil tank piping materials made according to ASTM A333 and A350 may be used at API Std 650 fixed roof tanks design metal temperatures no lower than the impact test temperature required by the ASTM specification for the applicable material grade without additional impact tests. For temperatures below those allowed by the ASTM specification, the following paragraph shall apply.
Under the same sealing effect, the internal API Std 650 fixed roof tanks floating roof API 650 tank can further reduce the evaporation loss compared with the external floating roof API 650 tank. This is due to the shielding of the fixed roof and the gas phase layer between the fixed roof and the inner floating plate, which has more significant heat insulation effect than the double disc floating roof of the API Std 650 fixed roof tanks external floating roof tank.
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