Shop-fabricated API Std 650 partially anchored liquid-storage tanks
Selection of nominal diameter D of API 650 storage tank. In the design calculation of API 650 storage tank, the bottom plate thickness is the net plate thickness, that is, the actual thickness minus the corrosion allowance. In the design and calculation of API Std 650 partially anchored liquid-storage tanks wall thickness in hydrostatic test, the thickness of bottom plate is the total thickness of steel plate.
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Natural ventilation loss: the main cause of natural ventilation loss is that the API Std 650 partially anchored liquid-storage tanks is not tightly sealed. This is usually due to corrosion perforation on the top of the oil tank, or there is a height difference between the two orifices. The air tightness of the mixture in the API Std 650 partially anchored liquid-storage tanks is higher than that of the air, which causes the mixture gas in the tank to be discharged into the atmosphere from the lower hole, and the external air flows into the tank from the high hole, resulting in natural ventilation loss.
