Steel plate for bottoms of API 650 anchored liquid-storage tanks

API 620 crude oil tank piping materials made according to ASTM A333 and A350 may be used at API 650 anchored liquid-storage tanks design metal temperatures no lower than the impact test temperature required by the ASTM specification for the applicable material grade without additional impact tests. For temperatures below those allowed by the ASTM specification, the following paragraph shall apply.

The application of API 650 is as stated by the American Petroleum Institute: The production and installation of our ground welded steel API 650 anchored liquid-storage tanks storage tanks are generally used in industry; under normal circumstances, the storage tanks installed on the industrial site in the United States are in accordance with API 650, API 620 and API 12d Standards are established.

Requirements for prefabrication of the top of large vertical API 650 anchored liquid-storage tanks: The prefabrication of the tank top shall be prefabricated in blocks according to the drawings. Pay attention to the spacing of the welds after installation when setting out the material. Reinforcing ribs should be formed and inspected with an arc-shaped template. When a single top plate needs to be spliced, butt joints should be used. The forming of a single top plate should be welded between the reinforcing ribs and the top plate on the mould. After forming, check with an arc-shaped sample plate, and the gap should not be greater than 10 mm.