Estratégia de manutenção com base em análise de confiabilidade dos equipamentos de uma linha de enfardamento de celulose

Abstract

The bailing lines are the last stage in the cellulose production process. The cellulose coming from the dryer is cut in rectangular sheets of preset dimensions and in the bailing lines are stacked, compacted, packed and tied for transport. Composed by a series of automatized and function-distinct equipment, the bailing lines presents various and random failure modes, resulting in elevated amount of corrective maintenance and increased reestablishment and production costs. The objective of this work is to carry reliability analysis using tools like RBD, LDA and RAM aiming to determinate the best maintenance strategy for the equipment based on the reliability of its subsystems and components. With the accomplishment of the work, it is verified that the failure behaviors of the components and subsystems of the equipment that have the greatest contribution to the unavailability of the lines are related to failures in the initial phase of operation or shortly after maintenance interventions. Thus, it was necessary to deepen the analysis using the fault tree analysis tool (FTA) to identify the root causes and propose actions to prevent failures.