API standard 650 self-anchored tanks top-angle attachment for self-supporting roofs

The main reason of "small breathing" loss of API standard 650 self-anchored tanks is the change of atmospheric temperature. When the temperature rises with the increase of solar radiation from dawn, the temperature of oil in the API standard 650 self-anchored tanks also changes, resulting in the acceleration of evaporation speed and the increase of evaporation pressure. When the pressure exceeds the positive pressure rating of the breathing valve, the oil-gas mixture in the API standard 650 self-anchored tanks is discharged into the atmosphere through the breathing valve, which is the "exhalation" process of the oil tank.

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The seismic effects on the tank wall of API 650 oil storage tank include the inertia moment generated by the weight of the API standard 650 self-anchored tanks tank and the hydrodynamic pressure of the reservoir, which can be divided into short period pulse pressure and long period fluid slopping convective pressure.