Safety analysis of process systems using Fuzzy Bayesian Network (FBN)

Esmaeil Zarei*, Nima Khakzad, Valerio Cozzani, Genserik Reniers

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

121 Citations (Scopus)


Quantitative risk assessment (QRA) has played an effective role in improving safety of process systems during the last decades. However, QRA conventional techniques such as fault tree and bow-tie diagram suffer from drawbacks as being static and ineffective in handling uncertainty, which hamper their application to risk analysis of process systems. Bayesian network (BN) has well proven as a flexible and robust technique in accident modeling and risk assessment of engineering systems. Despite its merits, conventional applications of BN have been criticized for the utilization of crisp probabilities in assessing uncertainty. The present study is aimed at alleviating this drawback by developing a Fuzzy Bayesian Network (FBN) methodology to deal more effectively with uncertainty. Using expert elicitation and fuzzy theory to determine probabilities, FBN employs the same reasoning and inference algorithms of conventional BN for predictive analysis and probability updating. A comparison between the results of FBN and BN, especially in critically analysis of root events, shows the outperformance of FBN in providing more detailed, transparent and realistic results.

Original languageEnglish
Pages (from-to)7-16
Number of pages10
JournalJournal of Loss Prevention in the Process Industries
Publication statusPublished - 2019


  • Bayesian network
  • Criticality analysis
  • Fuzzy logic
  • Probabilistic safety assessment
  • Process systems


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