Analysis and pressure material selection for vessels that complies with the safety conditions of service within a hidrotatamento unit (HDT) in a refinery

Oil refineries are one of the industries most important to the functioning of the country that generate end products from oil received from production fields. The different locations in the refinery where occur the refining processes are the process units, also called refining or processing units. Each of these units comprises a set of equipment responsible for a refining step. The hydrotreating catalyst is a hydrogenation process which is currently operated at the refineries with a performance degradation of about 90% of compounds of sulfur, nitrogen and oxygen from the liquid fractions of petroleum distillates. Refinery pressure vessels are not only the most important features of most process industries, as well as usually the larger items, weight and unit costs, representing on average 60% of the total cost of materials and unit equipment process. This paper aims to describe the procedures for correct analysis and selection of materials to be used in pressure vessels, which meets with security service conditions within a unit at the refinery, taking into account the mechanical properties of materials, corrosion resistance, welding, obtaining facilities manufacturing and the expected useful life, based on the ASME code, the PETROBRAS and ASTM standards.