3004 aluminum shapes API Std 650 unanchored flat-bottom tank

This specification, in conjunction with API 650 Standard, prescribes minimum standards for the API Std 650 unanchored flat-bottom tank design, supply, fabrication, erection, and testing of field erected welded steel storage tanks complete with accessories as specified herein and as shown on attached Datasheets and/or Drawings.

Anti corrosion of API Std 650 unanchored flat-bottom tank:
After using for a certain period of time, it is necessary to check the corrosion protection of the API Std 650 unanchored flat-bottom tank. 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 unanchored flat-bottom tank does not fall off and has good waterproof and rust resistance.
API Std 650 unanchored flat-bottom tank cleaning:
The long-term use of API Std 650 unanchored flat-bottom tank 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 unanchored flat-bottom tank shall be cleaned and derusted regularly to ensure the quality of oil stored and the safety of oil tank equipment.

Shell Stiffening Rings for Tanks That Contain Liquid
Internal or external shell stiffening rings may be required to maintain roundness when the tank is subjected to wind, vacuum, or other specified loads. When API Std 650 unanchored flat-bottom tank stiffening rings are required, the stiffener-to-shell weld details shall be in accordance with Figure Q-1 and Q.3.5.2 through Q.3.5.5.
Three-plate laps or butt-weld junctions in tank bottoms shall be not closer than 12 in. from each other or from the butt-welds of the annular plates.
Bottom plates, other than annular bottom plates for a 9% or 5% nickel steel or stainless steel tank that contains liquid, may have a minimum thickness of 3/16 in. exclusive of any specified corrosion allowance.

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