Análise de falhas baseada em engenharia da confiabilidade em uma bomba centrífuga no processo reliquefação de amônia de uma planta petroquímica

Abstract

An industrial fertilizer plant, in operation since 1982, has two centrifugal ammonia pumps, which are responsible for the transfer of unused surplus ammonia from the urea unit to the storage tank. These pumps are of extreme importance for the process, since their failure can imply loss of product containment (in this case ammonia), causing environmental contamination, significant financial loss due to production stoppage and high risk of accidents with significant health and people's life. Therefore, through the data obtained with the use of reliability tools, it was verified the need to review some operating and maintenance procedures due to the history of unavailability of this system due to the failure of these pumps. Therefore, due to the significant increase in the number of interventions in these equipments, and, consequently, an increase in the unavailability of the system due to the loss of function. It was evidenced the necessity of a more detailed study of the causes of these disorders, being the objective of this work to make an analysis of the life data of the equipment, to parameterize the obtained values and, through the Methods for Failure Analysis and Simulation via Block Diagrams of reliability , investigating the causes of increased interventions and rework performed on the equipment, correcting the causative events, and predicting the optimal timing of preventive maintenance associated with the correct mode of pump.