API Std 650 mechanically-anchored steel tanks shell-to-bottom welds

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Anti corrosion of API Std 650 mechanically-anchored steel tanks:
After using for a certain period of time, it is necessary to check the corrosion protection of the API Std 650 mechanically-anchored steel tanks. If necessary, the outer wall of the metal oil tank should be painted with new anti-corrosion paint to ensure that the outer wall of the API Std 650 mechanically-anchored steel tanks does not fall off and has good waterproof and rust resistance.
API Std 650 mechanically-anchored steel tanks cleaning:
The long-term use of API Std 650 mechanically-anchored steel tanks will produce impurities on the tank wall and deposit on the tank bottom, resulting in tank corrosion to leakage. According to the safety standard of oil tank, the API Std 650 mechanically-anchored steel tanks shall be cleaned and derusted regularly to ensure the quality of oil stored and the safety of oil tank equipment.

When as-rolled plate material complies with impact test requirements as specified here, the material need not be normalized. If, as with ASTM A516, the specification prohibits impact test without normalizing but otherwise permits as-rolled plates, the API 620 welded storage tanks material may be ordered in accordance with the above provision and identified as “MOD” for this API modification.