Dispositivos críticos de segurança: automação e instrumentação aplicadas à segurança operacional

Abstract

After having suffered accidents of processes that involved financial losses and environmental impacts, the industrial plant, studied in this work, sought the management of the integrity of operating systems and critical processes, introducing instruments and logics of automation, based on Safety Instrumented System (SIS) ) and IEC-61511-1. This deployment of devices that monitor, control and act on critical processes are called "Critical Security Devices" (CSD). In order to construct this work, a qualitative methodology was carried out, investigating the main accidents already occurring in the global plant business, analyzing root causes in order to take measures to avoid new events. The method used for such investigation was the criticality survey of plant assets and their possible impacts and worse scenarios. This work describes the existing processes in the plant and its main risks, covering the critical equipment analyzed. It also describes the instruments used to monitor process variables, describes the actions that automation logics must perform, and the reliability plan for CSD such as operational, predictive, logic and precision tests. Finally, it shows the implanted instruments and the result of a survey conducted with the plant employees regarding the CSD.