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Since its inception and early use in the European offshore industry, applying IEC61508 has proved problematic in many areas, especially that of SIL assessment. Since this is part of the fundamental process of establishing the required risk reduction, its mis-application will result in either insufficient protection or the installation of over-complex systems with their associated maintenance and testingburden. This confusion and uncertainty has several causes – lack of clarity in the standard, inappropriate starting documentation, failure to understand the importance of the relationship between risk graph calibration and residual risk, etc. From the learning experience of carrying out SIL assessments on real projects, the speaker will address some of the main problem areas in SIL assessments and describetechniques to make the process both more effective and less time consuming
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