The role of human error in risk analysis

application to pre- and post-maintenance procedures of process facilities

Alireza Noroozi, Nima Khakzad , Faisal Khan , Scott Mackinnon, Rouzbeh Abbassi

Research output: Contribution to journalArticle

60 Citations (Scopus)


Human factors play an important role in the safe operation of a facility. Human factors include the systematic application of information about human characteristics and behavior to increase the safety of a process system. A significant proportion of human errors occur during the maintenance phase. However, the quantification of human error probabilities in the maintenance phase has not been given the amount of attention it deserves. This paper focuses on a human factors analysis in pre-and post- pump maintenance operations. The procedures for removing process equipment from service (pre-maintenance) and returning the equipment to service (post-maintenance) are considered for possible failure scenarios. For each scenario, human error probability is calculated for each activity using the Success Likelihood Index Method (SLIM). Consequences are also assessed in this methodology. The risk assessment is conducted for each component and the overall risk is estimated by adding individual risks. The present study is aimed at highlighting the importance of considering human error in quantitative risk analyses. The developed methodology has been applied to a case study of an offshore process facility.
Original languageEnglish
Pages (from-to)251-258
Number of pages8
JournalReliability Engineering and System Safety
Publication statusPublished - Nov 2013
Externally publishedYes


  • human error
  • maintenance procedure
  • SLIM
  • event tree
  • risk analysis

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