5454 aluminum pipe API standard 650 flat-bottom oil storage tanks

This standard only applies to API 650 storage tanks API standard 650 flat-bottom oil storage tanks with uniform bottom support and non-refrigerated service storage tanks with a maximum design temperature of not more than 93 degrees Celsius (200 degrees Fahrenheit).

API 620 Crude Oil Tank Pneumatic Pressure
An air pressure equal to 1.25 times the pressure for which the vapor space is designed shall be applied to the enclosed space above the water level. In the case of a double-wall tank with an open-top inner tank, where the air pressure acts against the outer tank and the inner tank is thus not stressed by the air pressure, the inner API standard 650 flat-bottom oil storage tanks may be emptied of water before the pneumatic pressure test begins. The test pressure shall be held for 1 hour.

The cleanliness of the API standard 650 flat-bottom oil storage tanks has a great influence on the safety of the tank and the quality of the oil stored. Keeping the API standard 650 flat-bottom oil storage tanks clean can slow down the corrosion of the tank wall and reduce the pollution to the oil. If the inside of the API standard 650 flat-bottom oil storage tanks is not cleaned all the year round, a lot of rust and metal impurities will be produced in the tank. These impurities will cause the oil to slowly oxidize and deteriorate. The impurities mixed into the oil will also block the filter and oil circuit, causing oil supply failure.

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