API Std 650 unanchored flat-bottom tank in SUG III

Prevent the storage liquid from impacting the inner wall of the API 650 petroleum storage tank or increase the internal pressure, reduce the corrosion of the tank top and the tank wall, and extend the service life of the API Std 650 unanchored flat-bottom tank storage tank.

Combination of Design Loads
The inner tank API Std 650 unanchored flat-bottom tank shall be designed for the most critical combinations of loading that result from internal pressure and liquid head, the static insulation pressure, the insulation pressure as the inner tank expands after an in-service period, and the purging or operating pressure of the space between the inner and outer tank shells, unless the pressure is equalized on both sides of the inner tank.

Generally, the snow load in the API Std 650 unanchored flat-bottom tank construction area should be considered before the design and construction of the tank. The snow load in the API Std 650 unanchored flat-bottom tank 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.

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