solids. An state of the art of the theories of pressures and flow proposed by the most important researchers and international standards on the subject is presented. As a practical example, the pressures were determined in a slender vertical silo with conical bottom, for mass and funnel flow patterns and for two granular materials. Based on the study, a proposal of Brazilian standard was elaborated for the determination of the pressures due the bulk solids for slender silos, considering that Brazil doesn't still have a specific standard for the design and construction of silos. A software for pressures determination was also developed.