EN 10025 S275 plates API standard 650 storage tank

The tank wall design of API 650 oil storage tank. Since there is no ventilation pipe directly connected with the outside on the top of the API standard 650 storage tank tank, the ventilation between the inside and outside of API 650 oil storage tank is realized by the respiration valve. The constant pressure of the respiration valve is 0.3kPa, so the pressure on the top of the tank is 0.3kPa.

Soil Structure Interaction: Soil structure interaction per API 650, Section E.6.1.6 may be used for OLE design providing the damping ratio does not exceed 10 %.
Allowable Stresses
Design allowable stresses shall be per API 620 large welded steel storage tank, Section Q.3.3, including the 33 % increase permitted for earthquake loads.
Self-anchored Inner Tank
The anchorage ratio for a self-anchored inner tank, J, shall not exceed 1.0 for the OLE design combination to limit uplift and stresses in the annular plate and corner weld.
Foundation Stability
The overturning ratio defined in API 650, Section E.6.2.3, Equation (E.6.2.3-1) shall be equal to or greater than 3.0 for the defined OLE event.

The water dissolved in the oil will be separated out from the oil stored in the API standard 650 storage tank for a long time, and the acidic water layer will appear at the bottom of the API standard 650 storage tank for a long time, which will accelerate the corrosion of the API standard 650 storage tank and cause the wall thinning and even leakage. With the increase of service life, the API standard 650 storage tank must be inspected and cleaned regularly to check the hidden danger.

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Japan is a typical shipping first, and its raw materials are imported from Oceania, central and South America and other Asian countries. Most of the API standard 650 storage tank steel produced is exported to China and other Asian countries, and a small amount is exported to America. Shipping is the main way of its API standard 650 storage tank steel international transportation. According to the data, steel goods account for about 20% of the total sea freight in Japan. The domestic transportation of Japanese steel is mainly truck.

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