Presenting of failure probability assessment pattern by FTA in Fuzzy logic (case study: Distillation tower unit of oil refinery process)

Omidvari, Manouchehr; Lavasani, Seyed Miri; Mirza, S.

doi:10.1016/j.jchas.2014.06.003

Cited by 36 publications

(22 citation statements)

References 21 publications

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“…Results from Omidvari et al's study (2014) showed that a type of process failure, i.e. the obstruction of catalyst had the highest importance measure in fault tree (11). All findings mentioned above, revealed that process failures play a very important role in TEs occurrence for process hazardous scenarios.…”

Section: Discussionmentioning

confidence: 95%

“…Results of the studies of Omidvari et al (2014) and Mohsendokht (2017) showed that the process HAZOP was useful for identifying process failures in the fault tree construction phase. However, it cannot be used to identify some of the hazardous events, such as human errors and some of the mechanical failures (4,11).…”

Section: Discussionmentioning

confidence: 99%

“…However, it cannot be used to identify some of the hazardous events, such as human errors and some of the mechanical failures (4,11). Therefore, the current study developed a combined HAZOP, brainstorming, and FMEA model to overcome the weakness of process HA-ZOP to identify the different hazardous events associated with TE.…”

Section: Discussionmentioning

confidence: 99%

“…Area De-fuzzification technique (ADT) method is the defuzzification process of the AFFPS to a CFPS. The ADT method for a fuzzy triangular membership function µ A˜( r 1 , r 2 , r 3 ) is described as follows (14): (11) x * = CF P S…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

“…The conversion function could be done by Onisawa logarithmic function, which is described as follows (11,14): (12) …”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

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Failure Occurrence Probability Assessment of Claus Furnace Package in Sulfur Recovery Unit Using Fault Tree Analysis Based on Conventional and Fuzzy-Based Approach

Bakbaki

Nabhani

Anvaripour

et al. 2018

Jundishapur J Health Sci

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Background: If shutdown scenario of burner of the sulfur recovery unit takes place, toxic release, fire, and explosion accident can easily occur. Therefore, it is essential to assess the basic causes of burner shutdown scenario. Fault Tree Analysis (FTA) could be used to assess the occurrence probabilities of burner shutdown scenario and its basic causes/events. The failure occurrence probability of these Basic Events (BE) are often not available in lack of data and uncertain conditions. Objectives: This study was done to provide a comprehensive approach for analyzing and calculating BEs failure occurrence probability affecting the shutdown scenario, using combined fuzzy logic, expert judgment, and FTA. Methods: The study was carried out from June to December, 2016. In this study, a fuzzy-based approach based on expert judgment was proposed to calculate the occurrence probability of burner shutdown scenario in lack of data and uncertain conditions. The brainstorming and FMEA, and HAZOP study were first used to identify fault events of the fault tree. Then, based on these methods, the fault tree was constructed. Subsequently, the failure occurrence probabilities of BEs and shutdown scenario were calculated using the fuzzy-based approach and a conventional approach. Finally, the Fussell-Vesely importance analysis was used to rank the BEs in FTA. Results: Results showed that the occurrence probability of shutdown scenario was 4.76E-04 per year. Since the failure occurrence probabilities of some BEs were not available, using failure probability functions in the conventional approach cannot provide failure occurrence probabilities of those BEs. Therefore, the occurrence probability of shutdown scenario based on the conventional approach was not available. Based on the Fussell-Vesely importance measure analysis, it was determined that the blower failure while running, air pre-heater blockage, and shut-off valve fail close were 3 major causes of "burner shutdown scenario". Conclusions: The fuzzy-based approach could derive a failure occurrence probability of BEs based on expert subjective judgments using the failure possibility distributions (FPDs) in lack of data conditions. This study overcame the weaknesses of the conventional approach, to calculate BEs failure occurrence probabilities via fuzzy logic.

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Section: Discussionmentioning

confidence: 95%