This paper aims at discussing the main advantages of repeating a FPSO Project for different oil fields developed by PETROBRAS. It will also be discussed the main aspects which shall be considered during projects based on oil tankers conversion into FPSOs, emphasizing the topics that can influence the overall progress of the works. Contractual requirements have been highlighted, such as minimum Brazilian national content, engineering scope of work, type of contracting, standardization of systems, construction using topside modules concept and some other points. Special attention must be given to the material and piping specification, as well as to the versions of applicable Rules and Regulations and Classification Society requirements. Case study based on the FPSO PETROBRAS 50 (P-50) and its " younger sister?? PETROBRAS 54 (P-54) project is presented, giving special attention to the Topsides and Marine systems, as well as to hull conversion works and related technical documentation. All the advantages obtained from the similarity and repeatability between the projects have been discussed, showing how they contributed to reduce the delivery time of the Unit. Other aspects adopted in such projects will be presented herein, such as: integrated team between the Operation and C&A (Construction & Assembling). Also, a focus on HSE (Healthy, Safety and Environment) during the construction and assembling phase will be presented. Introduction The development plan of an oil production field starts during the conception phase. During this phase, the type of the Unit to be installed and the construction schedule are defined. If the Unit to be adopted is a FPSO (Floating, Production, Storage and Offloading), 02 (two) options are possible: a tanker conversion or a new built hull. The type of Unit to be adopted for the field exploitation depends mainly on a technical-economic analysis, which is developed by PETROBRAS. At this moment, some alternatives are evaluated and considered, such as the type of hull (converted vessel into a FPSO, FPSO with new hull, converted Semi-Submersible, new SS), capacity of the production plant, facilities, etc. According to the economic-financial return for each option and taken into account the possibilities at the moment (availability of vessels for conversion, for instance), the chosen alternative will be the one that presents the best results. In general, the technical teams prefer customized projects for production Units. It means that the Unit must be a " Taylor made?? project, built specifically for each field. However, in some situations, this is not the best alternative to be followed. In this way, the premises of repeatability and similarity are an optimized and very attractive decision that will result in a highest financial gain.