Multiphase extraction projects used

The heterogeneities are often unavoidable, such as in the case of the structures partially immersed in seawater or in the case of the foundations of wells for the extraction of multiphase crude oil, and in the vast majority of cases, they arise from the project. Sometimes, the heterogeneities are intentionally made, and the electrochemical corrosion is intentionally localized, such as in the case of heat exchangers, where the tube sheet is realized with high allowances and by using less noble material than that of the pipes. 

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