June 2001

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HP Automation Safety: The trend toward SIL2

A new market study I worked on shows that the percentage of SIL3 safety instrumented functions (SIFs) is decreasing. SIFs are getting classified more and more as SIL1 and SIL2. Why is t..

Goble, W., exida LLC

A new market study I worked on shows that the percentage of SIL3 safety instrumented functions (SIFs) is decreasing. SIFs are getting classified more and more as SIL1 and SIL2. Why is that? Digging a little deeper, a number of reasons are popping up. Those who do risk analysis are using more advanced quantitative and semi-quantitative techniques like layer of protection analysis (LOPA). By considering all the independent layers of protection available for a particular hazard, risk reduction provided by these layers is calculated. All that is required of the safety system is to cover the remaining risk reduction. Integrit

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