Over the years, Studio Santi has acquired expertise and experience in the fit-for-purpose assessment studies of oil and gas pipelines and, generally, of infrastructures for oil & gas logistics. At the port of Civitavecchia, Studio Santi conceived and coordinated the rehabilitation of an offshore pipeline affected by internal bacterial corrosion (MIC), using the difficult in-situ cleaning&coating technique. Following this intervention, for over a decade Studio Santi has coordinated a series of complex instrumental investigations, carried out by Rosen Inspection Technologies using smart-pigs equipped with all possible inspection technologies: MFL, UT, SIC/EC. The use of complex models of interpretation of the experimental data coming from the inspections, made possible to carry out the fit-for-purpose assessment studies and the pipeline was able to continue unloading millions of tons of petroleum products.