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How taking credit for planned and unplanned shutdowns can help you achieve your Safety Integrity Level (SIL) targets

by Keith Brumbaugh, P.E., CFSE

Achieving Safety Integrity Level (SIL) targets can be difficult when proof test intervals approach
turnaround intervals of five years or more. However, some process units have planned and predictable
unplanned shutdowns multiple times a year. During these shutdowns, it may be possible to document
that the safety devices functioned properly. This can be incorporated into SIL verification calculations to
show that performance targets can now be met without incorporating expensive fault tolerance, online
testing schemes, etc. This can result in considerable cost savings for an operating unit.

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