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    STUDIA AMBIENTUM - Issue no. 1-2 / 2008  

  Abstract:  The paper reviews the aspects of piping risk assessment with special attention to the application of the layer of protection analysis framework (LOPA). This method is defined as a semi-quantitative method based on a system of protection layers that includes simplified approaches to characterize the consequences and estimate the frequencies for risk determinations of the particular accident scenario. Such a use for piping is called classical LOPA approach (pLOPA). Due to numbers of uncertainties concerning required failure frequency rate of the protection layers, that work explores of the application of fuzzy logic which typically can deal with uncertainty and imprecision, and it is an efficient tool for problems where lack of knowledge occurs. Such approach is called fuzzy LOPA (fpLOPA). Both approaches will be illustrated by the case study for the segment of long pipeline transporting flammable product.

Keywords: pipelines, risk assessment, layer of protection, fuzzy logic
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