API standard 650 mechanically-anchored flat-bottom tanks with a berm foundation

The vent pipe mouth should be 4m or more above the ground. The nominal diameter of the API standard 650 mechanically-anchored flat-bottom tanks API 650 petroleum storage tank vent pipe should be no less than 50mm and a flame arrestor should be installed.

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 standard 650 mechanically-anchored flat-bottom tanks 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.

In order to prevent the deformation of the bottom of metal vertical API standard 650 mechanically-anchored flat-bottom tanks during welding, comprehensive control measures such as strict control of assembly geometry size, reasonable welding procedure, process control of welding deformation and rigid fixation are adopted during assembly welding. The specific methods are as follows:
1. Strictly control welding groove forming of API standard 650 mechanically-anchored flat-bottom tanks.
2. Strictly control the size of tank welding seam assembly.
3. Define the welding sequence of tank bottom plate.
4. Reasonable distribution of welders.

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