Model for Assessing the Safety Integrity Level (SIL) of Electrical/Electronic/Programmable Safety-Related Systems

Esperanza S. Torres (Corresponding Author), Srinivas Sriramula, David Celeita, Gustavo Ramos

Research output: Contribution to journalArticle

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Abstract

Nowadays, different industries such as nuclear, automotive, process, chemical, and oil & gas industry, must meet specific requirements in order to keep and reduce safety risks to as low as reasonably practicable (ALARP) level. As a result, the number of electrical/electronic/programmable electronic safety-related systems (E/E/PES) to control, prevent and mitigate hazardous events has increased. Moreover, new guidelines and procedures have been developed to guarantee the availability and function of safety systems over their service life. Based on Markov processes, this paper proposes a reliability model to assess the integrity and verify the design of E/E/PES safety-related systems. The average probability of failure on demand (PFDavg) and Safety Integrity Level (SIL), are used to determine the reliability performance of an E/E/PES in a low demand mode of operation in accordance with the functional safety principles of the IEC 61508 and IEC 61511 standards.
Original languageEnglish
JournalIEEE Transactions on Industry Applications
Publication statusAccepted/In press - 21 Aug 2019

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Keywords

  • Safety integrity level
  • probability of failure on demand
  • functional safety
  • IEC 61508
  • Markov processes
  • reliability assessment

Cite this

Model for Assessing the Safety Integrity Level (SIL) of Electrical/Electronic/Programmable Safety-Related Systems. / Torres, Esperanza S. (Corresponding Author); Sriramula, Srinivas; Celeita, David; Ramos, Gustavo.

In: IEEE Transactions on Industry Applications, 21.08.2019.

Research output: Contribution to journalArticle

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