This document consists of a description of the project for converting a bunker oil barge from single-hull to double-hull, for this to meet the regulations of the maritime authority of Peru and the rules of the RINA Classification Society. It is exposed to the Owner, technical and economic options, in order to bring to him the best solution in time and budget. Also, is brought into discussion, the benefit to the owner that it would be of converting the outer hull. So as well, is presented, the challenges faced during the production process and the solutions adopted by the engineering team and shipyard production.