API Std 650 carbon steel tank owner

The main reason of "small breathing" loss of API Std 650 carbon steel tank 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 Std 650 carbon steel tank 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 Std 650 carbon steel tank is discharged into the atmosphere through the breathing valve, which is the "exhalation" process of the oil tank.

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Insulation Load
For API 620 tanks designed and constructed with an outer tank containing loose fill insulation in the annular space between the tanks, the insulation weight shall be divided equally to the inner and outer tank wall for seismic lateral loads unless a more rigorous analysis is performed to determine the distribution. The insulation within the annular space shall not be used to calculate resistance to overturning. Insulation on the API Std 650 carbon steel tank roof or suspended deck shall be applied to the tank supporting the load at the point or center of gravity of attachment and may be used to resist overturning.

There is a gap of 100 mm to 500 mm between the shell of API 650 crude oil storage API Std 650 carbon steel tank tank and the floating plate of external floating roof to ensure that there is no chuck during operation. Use API Std 650 carbon steel tank edge sealing system to reduce edge evaporation. The support legs of API 650 crude oil tank floating roof are usually movable and retractable and suspended in liquid.