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TYPICAL DAMAGES OF ABOVEGROUND STEEL

TANKS

During theirs exploitation the above ground steel tanks bear unfavorable influence of

the environment and stored product. Their status becomes worse and many damages

are collected into a tank and they can cause serious failures of the steel facility.

Referring to this thesis the author visited many oil storage bases, where he saw and

evaluated the current damages of the tanks in the exploitation.The correctness of one project decisions could be better evaluated after determined

period of exploitation of the facility. Different constructive solutions taken during the

years can cause different damages of the above ground steel tanks.

1. Deviation of design geometric shape:

- local lose of stability;

- total (of whole tank) lose of stability;

- deviation to inside or outside of shell and bottom;- movement and / or bending of annular bottom plates.

a) plane settlement:

- settlement of the whole bottom;

- settlement of the perimeter of tank.

b) i l ttl t

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b) irregular settlement:

Corrosion of anchors Settlement of the tank

Sinking in foundation

Lifting of tank and plants under bottom

Cavity under the steel bottom Corrosion of shell inside the tank

http://www.astanks.com/Internal_shell_corrosion.htmlhttp://www.astanks.com/Cavity_under_bottom.htmlhttp://www.astanks.com/Plants%20under%20the%20bottom.htmlhttp://www.astanks.com/Sink%20in%20the%20foundation.htmlhttp://www.astanks.com/Settlement%20of%20the%20tank.htmlhttp://www.astanks.com/Corrosion%20of%20Anchors.html

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Corrosion of roof plates Corrosion under heat insulation

Corrosion of bottom plates

Plants on spiral stairway

Local deformations of the shell Deviation of shell into inside

http://www.astanks.com/Hlytwane.htmlhttp://www.astanks.com/Local_deformations.htmlhttp://www.astanks.com/Plants%20on%20the%20ladders.htmlhttp://www.astanks.com/Internal%20corrosion.htmlhttp://www.astanks.com/Corrosion%20under%20heat%20insulation.htmlhttp://www.astanks.com/Corrosion%20on%20the%20roof.html

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Surface damages, lap joints

and reinforcement of welds

Lap vertical joint in the shellHolding of a water on the floating roof

http://www.astanks.com/Water%20on%20Floating%20roof.htmlhttp://www.astanks.com/Lap%20vertical%20joint.htmlhttp://www.astanks.com/Surface%20damages.html