The aim of the dissertation is to determine the ideal location for the construction of an online diesel blending system in Duque de Caxias Refinery - REDUC. The model used in this study is similar to that used for determining the best location for a distribution center. In this case, specifically, the objective function of the problem is to minimize costs with pipes for the construction of the online blending system in the oil refinery. This work is another example of how the logistics can be used as a tool capable of optimizing the flow of movement of origins to the destinations, seeking perfection meet with the requirements of a complex engineering project. The results obtained in this dissertation, through the application of the methodology proposed, provided for Petrobras a significant increase in financial return of the project.