aluminum sheet 5456 API standard 650 welded aluminum storage tanks

When API 650 storage tank is designed, when the design pressure is small F2 kPa, the impact of air pressure on the API standard 650 welded aluminum storage tanks tank wall thickness is not considered in the tank wall design.

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Pressure Setting of Safety DevicesExcept as provided in API 620 tank 9.5 for certain liquid relief valves, the pressure setting of a pressure-relieving device shall in no case exceed the maximum pressure that can exist at the level where the device is located when the pressure at the top of the tank equals the nominal pressure rating for the tank (see API 620 tank 5.3.1) and the liquid contained in the tank API standard 650 welded aluminum storage tanks is at the maximum design level.Vacuum-relieving devices shall be set to open at such a pressure or partial vacuum that the partial vacuum in the tank cannot exceed that for which the tank is designed when the inflow of air (or other gas or vapor) through the device is at its maximum specified rate.