A633 Gr C plates API Std 650 carbon steel tank

The water dissolved in the oil will be separated out from the oil stored in the API Std 650 carbon steel tank for a long time, and the acidic water layer will appear at the bottom of the API Std 650 carbon steel tank for a long time, which will accelerate the corrosion of the API Std 650 carbon steel tank and cause the wall thinning and even leakage. With the increase of service life, the API Std 650 carbon steel tank must be inspected and cleaned regularly to check the hidden danger.

Allowable compressive stresses shall be in accordance with 5.5.4 except that for aluminum alloy plate the allowable compressive stresses shall be reduced by the ratio of the modulus of compressive elasticity to 29,000 for values of (t – c)/R less than 0.0175 and by the ratio of the minimum yield strength for the aluminum alloy in question to 30,000 for values of (t – c)/R equal to or greater than 0.0175 (see 5.5.2 for definitions). In all other equations in this standard API Std 650 carbon steel tank where yield strength or modulus of elasticity is used, such as Equations 27 and 28, similar corrections shall be made for aluminum alloys.

The application of API 650 is as stated by the American Petroleum Institute: The production and installation of our ground welded steel API Std 650 carbon steel tank 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.

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