Implementing a suitable safety instrumented system-Part 2
The analysis is the most important step for engineering and designing a suitable system
SIL assessment is the process of selecting the appropriate
risk-reduction factor required for the SIS to achieve an
acceptable risk level.
Qualitative and quantitative analyses are used to assign the
SIL to the identified risk. Qualitative analysis is on personal
experience/judgment/ past history of similar plant, whereas
quantitative qnalyses is a systematic development of numerical
estimates of expected frequency and/or consequences of
potential accidents. Different methods such as risk matrix,
LOPA, event tree, fault tree and risk graph are used for SIL
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