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ASTM A1011 grade 33 sheets API620 petroleum storage tanks

ASTM A1011 grade 33 sheets API620 petroleum storage tanks

ASTM A1011 grade 33 sheets API620 petroleum storage tanks

API 650 is the standard for welded tanks for oil storage. It specifies the API620 petroleum storage tanks design, manufacturing, welding, inspection and installation requirements of oil tanks. API 650 is widely used in storage tanks with internal pressure less than or equal to 2.5 PSI.

Except as permitted by API standard 620 Q.8.6, the test shall be conducted after the entire tank is complete, before the insulation is applied. Except as limited by foundation or stress conditions, the test shall consist of filling the tank with water to the design liquid level and applying an overload air pressure of 1.25 times the pressure for which the vapor space is designed. The load on the supporting foundation shall preferably not exceed the established allowable bearing value for the tank site. Where a thorough evaluation of the foundation justifies a temporary increase, the established allowable bearing may be increased for the test condition, but the increase shall be not more than 25%.

When the day light gradually decreases, the temperature of oil in the API620 petroleum storage tanks will also decrease, the evaporation speed will gradually slow down, and the pressure in the API620 petroleum storage tanks will also decrease. When the pressure in the API620 petroleum storage tanks is lower than the negative pressure rating of the breathing valve, the outside air is sucked into the API620 petroleum storage tanks through the open vacuum valve, which is the "suction" process of the oil tank.

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