On the concept of safety instrumented systems
Palabras clave:Safety Instrumented System, SIS, Risk, safety integrity level, SIL, Lifecycle, Protection layer (es).
This paper presents a concrete definition of what a Safety Instrumented System (SIS) is. This involves important concepts such as risk, safety integrity level, SIL, life cycle and protection layer. The aim of this paper is to provide readers with a concise definition of SIS. To this end, the basic elements of a SIS are defined, the relationship of risk with a SIS is presented, layers of protection are defined in a industrial process, the implementation of a SIS is justified, and the correct methodology for the implementation of a SIS is obtained, namely Lifecycle. Finally, the paper describes a mathematical method for modeling and validating a particular SIS based on standards.
K. J. Mitchell , P. Hereña, T. M, “Safety Instrumented Systems Engineering Handbook”, 2010.
D. Hatch T., "Intech, Operatorsonalert, ISA", 2009.
Standard IEC 61511. 2003.
P. Ghrun, H.L. Cheddie, “Safety Instrumented Systems. DesignAnalysis, and Justification”, 2005..
Oil & Gas Journal. 2001
“Out of control: Why control systems go wrong and how to prevent failure”, UK HSE, Página 31.
R. Squillante, D. dos Santos Filho, L. A. Riascos, F. Junqueira, P. Miyagi, "Mathematical method for modeling and validating
of safety instrumented system designed according to IEC61508 and IEC 61511". Available in: http://www.abcm.org.br/pt/wp-content/symposiumseries/SSM_Vol5/Section_II_Control_Systems/