A841 Gr B plates API Std 650 open-top tanks

API 650 external floating roof storage tanks are generally called external floating roof API Std 650 open-top tanks tanks, which means that the storage tanks are externally open tanks without a dome design, and are equipped with vertical floating roofs. API 650 external floating roof storage tanks are usually used for large More than 20,000 cubic meters of open steel API Std 650 open-top tanks storage tanks for storing volatile petroleum products such as crude oil, gasoline, kerosene, etc.

The foundation design of the API Std 650 open-top tanks should meet the requirements of foundation stability and deformation, that is, the API Std 650 open-top tanks foundation should not be crushed and the uneven settlement value of the foundation should be within the allowable range. The uneven settlement of the storage tank foundation should be specified in the design process of the safe allowable range, because excessive uneven settlement will reduce the safety of the API Std 650 open-top tanks and cause distortion and deformation of the tank wall and bottom plate.

Uplift on Foundation
For API Standard 620 tanks with an internal design pressure less than 1 lbf/in.2 gauge, the uplift shall be taken as the smaller of the maximum uplift values computed under the following conditions:
a)The internal design pressure times 1.5 plus the design wind load on the shell and roof.
b)The internal design pressure plus 0.25 lbf/in.2 gauge plus the design wind load on the shell and roof.

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