The brazilian public administration, in its current stage, undergoes an intense process of improvement of the legal basis and practices related to the governamental procurement, which are based in the law Number 8.666 1993. In this context, legal instruments that enable the practice of purchasing centralization by public entities are identified, especially the Decret Number 8.250 2014, which updated the Registration Sistem Pricing, as well as the Decret Number 8.189 2014, which previse the creation of The Central of Procurement under the Ministry of Planning, Budget and Management. Situated within the pulic administration is the Brazilian Navy, under the Ministry of Defense. On the one hand, the Navy has an already consolidated structure of centralized purchasing of materials. On the other hand, we identify an interesting potential to be explored in relation to services’ purchasing. In this context, the present study aims to propose a model of cetralized purchasing of common services for the Brazilian Navy, in which will be defined the satandard of centralization to be adopted, the geographic scope of centralization and the institutional responsibilities of the organizations involved. Additionally, will be proposed an initial list of common services to be included in the model, as well as, will be estimated the economies of process, in terms of money and time, and scale expected from the implementation of the model. The results obtained are instigating, since the inferences made pointed to savings of millions of Reais.