(116r) Don't be Sil-Ly: Avoid These Common Mistakes during SIF Design and Sil Verification
AIChE Spring Meeting and Global Congress on Process Safety
2021
2021 AIChE Virtual Spring Meeting and 17th Global Congress on Process Safety
Global Congress on Process Safety
GCPS Poster Session
Wednesday, April 21, 2021 - 3:00pm to 4:00pm
- Optimistic estimates of a siteâs competence in executing the required SIF proof tests
- Optimistic estimates of the effectiveness of proof tests in discovering potentially dangerous faults
- Use of reliability data for SIF components which is outside of typical industry limits
- Specifying insufficient robustness/redundancy in the SIF design architecture
- Unrealistic expectations of equipment life/mission time
This paper will analyze the results of a sensitivity analysis of a SIL Verification performed on a hypothetical SIF, in which common input factors such as proof test intervals, proof test coverage, mission time, component reliability, and design architecture are manipulated to examine the effect of each on the calculated SIL level. Understanding the importance of these input factors will result in more pragmatic SIF design and SIL verification, with the ultimate benefit being a SIF which delivers the advertised SIL rating over the desired mission time.
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