The paper describe an interesting case of rectangular reinforced concrete tank strengthening. Due to errors in reinforcement design, the long walls of the tank were seriously cracked and starts to leak during the water test. As alternative to total tank demolition, a simple and effective strengthening method was developed and applied. Because the basic defects occurred in long walls of structure, the tie system was designed and constructed. The group of precisely located bar ties anchored on the strengthened walls outer surfaces reduced the stresses in these walls to the level, which could be carried by structure with existing reinforcement. The ties and their anchorages were made of stainless steel, and during design special attention was paid to actual technical state of the tank structure and its environmental conditions. The successful strengthening allow the tank to start the operation with only small time delay and any problems actually noticed.
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