The lowest design temperature of API 650 cylindrical tanks

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

The inner and outer tanks may be decoupled for seismic design of the tank and anchorage and assumed to act independently. However, if the inner and outer tanks API 650 cylindrical tanks are supported by a common foundation, the seismic foundation loading shall be calculated using the lesser response modification values for either the inner tank or outer tank for both tanks and a dynamic analysis shall be performed to determine the combined effect.
Allowable Stresses: For Appendix R tanks, design allowable stresses shall be per API 620 large low pressure storage tank, Section R.3.3.

There is a gap of 100 mm to 500 mm between the shell of API 650 crude oil storage API 650 cylindrical tanks tank and the floating plate of external floating roof to ensure that there is no chuck during operation. Use API 650 cylindrical tanks 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.

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