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  • PostedTuesday, April 5,2016 at 9:39 PM

    The authors will present examples to illustrate this process and how different models affect the results. Hazard scenarios to be presented include leaks from flammable storage and transfer systems resulting in outdoor vapor cloud explosions as well as explosions within a building. Through these examples, differences in hazard impacts will be presented. Various likelihood references and resultant risk rankings will be shown. Based on these risk rankings and a tolerable risk criteria, proposed safeguards necessary to close a gap will be described. Presenting information in this manner allows the site leadership team to better allocate resources more effectively in minimizing facility siting risks.

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  • PostedTuesday, April 5,2016 at 9:37 PM

    This paper will highlight changes to the above codes / standards as they apply to the concepts of Safety Instrumented Systems. This will include a discussion on equivalency clauses and / or linking paragraphs to ISA S84.00.01 ‐ 2004 (IEC 61511 Mod) possibly allowing deviation from prescriptive requirements. Also of significant note is the modification of logic solver requirements with inclusion of a direct reference mandating the use of Safety PLCs with minimum SIL capabilities in certain instances. In addition, changes related to sensors and valve requirements will be highlighted. This paper will also highlight areas where the concepts of Safety Instrumented Systems in the author’s opinion have been potentially misapplied within the NPFA series.

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