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The selection stages by which process section (or node) is to be analyzed further based on Quantitative Risk Assessment (QRA) is crucial. Failure to select the node or process section could result in wrong Individual Risk number, and furthermore could cause ineffective risk mitigation. The selection can be performed by employing F&EI calculation as a screening method. F&EI is the most widely known method and used in the chemical industries. Dow’s Fire and Explosion index (F&EI) seventh edition is usually employed for fire and explosion hazard analysis. However, there is a limited number of works that have been proposed to employ F&EI as a screening method. In present paper, F&EI index is computed by developing a built-in Excel program with Microsoft Visual Basic® Application. The proposed procedure of boosting F&EI index as a screener to the QRA was applied to a selected case. This paper also discusses about the comparison between present and other procedures.

Assessment Study

Darmawan Ahmad Mukharror and Ronggo Ahmad Wikanswasto

Abstract. The selection stages by which process section (or node) is to be analyzed further based on Quantitative Risk Assessment (QRA) is crucial. Failure to select the node or process section could result in wrong Individual Risk number, and furthermore could cause ineffective risk mitigation. The selection can be performed by employing F&EI calculation as a screening method. F&EI is the most widely known method and used in the chemical industries. Dow’s Fire and Explosion index (F&EI) seventh edition is usually employed for fire and explosion hazard analysis. However, there is a limited number of works that have been proposed to employ F&EI as a screening method. In present paper, F&EI index is computed by developing a built-in Excel program with Microsoft Visual Basic® Application. The proposed procedure of boosting F&EI index as a screener to the QRA was applied to a selected case. This paper also discusses about the comparison between present and other procedures.

Keywords: fire and explosion index (F&EI), screening, quantitative risk assessment (QRA)

1. Fire and Explosion Index

Initially introduced by Dow Company in 1967, Fire and Explosion Index (F&EI) has been quickly adopted by chemical processing industry due to its simplicity and efficiency in measuring risk. F&EI aims to determine relative ranking of fire and explosion. This method had been revised for six times, and the last revision was published in 1994. Figure 1 shows the F&EI Procedure.
Material factor (MF), general process hazards, special process hazards and process unit hazards are used in calculating F&EI. Material factor is a metric to define inherent rate of potential energy release due to fire and explosion. Material factor can be determined by the measures of flammability (NF) and reactivity (NR) of the materials.
General process hazards (F1), which consider six factors, are characteristic of processes that have the potential to affect the severity of a loss incident. Magnitude of the penalty for each factor depends on its role in the preceding incidents as given by historical loss data.
Special process hazards (F2), which cover twelve items, are factors that add to the probability of a loss accident. Three of special process hazard factors are toxic material, pressure and quantity of flammable or unstable materials.

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