Many repairs on structures are performed without previous diagnosis and inspection from a structuralcorrosion
point of view enhancing the damages due to the creation of active areas which can cause
catastrophic accidents and increasing costs from ineffective maintenance and even shutdown of the
structure. This paper presents an evaluation and repair diagnosis from a structural corrosion point of
view of a basement located in a Power Unit of a Petrochemical Plant. This basement is continuously
exposed to floods and stagnation from Maracaibo’s lake water. This water is very aggressive since it
contains chlorides, foam and traces of oils. Due to structural problems, repairs were done urgently
without any previous inspection. An inspection was carried out after the repairs were completed in
order to evaluate them and elaborate a repair guideline. From this study, it was concluded that the
earlier repairs didn’t meet durability criteria and new repairs are suggested.