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Quantifying the effectiveness of explosion protection measures
Industrial processing of flammable materials including combustible dusts is connected with the risk of ignitions leading to explosion consequences. To minimise the risk from any ignition by incorporation of efficacious explosion prevention and protection measures is a key process plant design objective. In practice design engineers are challenged by the scale of this task particularly due to the complexity of many industrial processes and the often not intuitive or apparent design demand. The authors advocate the use of a risk modelling tool which sets out to quantify and interrogate the standing residual risk that the elected safety measures would fail to mitigate explosion consequences. A methodology was set out to guide industrial explosion safety system design by ascribing the residual risk of an unmitigated explosion occurrence. Most design practitioners consider each vessel of the process in isolation, although flame propagation may occur between interconnected vessels. Therefore, the methodology considers the entire process and the elected protection measures as a whole and facilitates trade-off decisions between viable protection options, permitting a risk based decision process for the most appropriate explosion protection solution. The calculation methodology and its strict mathematical interpretation provide for a directed graph representation of any process by a set of vertices (processing vessels) and connections (ducts and communition equipment) between these vertices. An example is given for a spray drying process with an additive residual risk for two vessels with equal ignition probability, including envisioned explosion protection measures, and for a milling and collection process. By adopting a deterministic process of ascribing risk based on the duty cycle of each component in a given process it is possible to fully quantify the efficacy of any elected safety alternative. Ignition location, ignition probability, parametric uncertainty and connectivity assumptions are discussed for different processes. The approach can assist practitioners in making an informed decision when ascribing efficacious explosion protection. In spite of the assumptions implicit in such a tool, the implicit uncertainties do not detract from the benefits of the approach to the overall process SIL (safety integrity level).
Quantifying the effectiveness of explosion protection measures
Industrial processing of flammable materials including combustible dusts is connected with the risk of ignitions leading to explosion consequences. To minimise the risk from any ignition by incorporation of efficacious explosion prevention and protection measures is a key process plant design objective. In practice design engineers are challenged by the scale of this task particularly due to the complexity of many industrial processes and the often not intuitive or apparent design demand. The authors advocate the use of a risk modelling tool which sets out to quantify and interrogate the standing residual risk that the elected safety measures would fail to mitigate explosion consequences. A methodology was set out to guide industrial explosion safety system design by ascribing the residual risk of an unmitigated explosion occurrence. Most design practitioners consider each vessel of the process in isolation, although flame propagation may occur between interconnected vessels. Therefore, the methodology considers the entire process and the elected protection measures as a whole and facilitates trade-off decisions between viable protection options, permitting a risk based decision process for the most appropriate explosion protection solution. The calculation methodology and its strict mathematical interpretation provide for a directed graph representation of any process by a set of vertices (processing vessels) and connections (ducts and communition equipment) between these vertices. An example is given for a spray drying process with an additive residual risk for two vessels with equal ignition probability, including envisioned explosion protection measures, and for a milling and collection process. By adopting a deterministic process of ascribing risk based on the duty cycle of each component in a given process it is possible to fully quantify the efficacy of any elected safety alternative. Ignition location, ignition probability, parametric uncertainty and connectivity assumptions are discussed for different processes. The approach can assist practitioners in making an informed decision when ascribing efficacious explosion protection. In spite of the assumptions implicit in such a tool, the implicit uncertainties do not detract from the benefits of the approach to the overall process SIL (safety integrity level).
Quantifying the effectiveness of explosion protection measures
Moore, P.E. (author) / Lade, R.J. (author)
2009
19 Seiten, 6 Bilder, 7 Tabellen, 15 Quellen
Conference paper
Storage medium
English
Gefahrstoff , Gefahrstofflager , Brennstofflager , Explosionsschutz , Brandschutz , Brandverhütung , Sicherheitsmaßnahme , quantitative Analyse , Quantifizierung , Sicherheitsmanagement , Bewertungsprogramm , Verband (Vereinigung) , Richtlinie , Strukturmodell , Reaktormodell , Entscheidungsmodell , mathematisches Verfahren
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