Before the Safety Integrity Level (SIL) analysis team can make recommendations for actions that should be taken to mitigate risk for a given safety instrumented system, the team must first assign a numeric rating to each instrumented function within that safety instrumented system. The SIL is a numeric value that represents an overall rating for the instrumented function. This rating tells you to what degree the instrumented function meets its requirements to mitigate risk. After you have assigned an SIL value to each instrumented function within a safety instrumented system, the combination of these values indicates the overall safety integrity of the safety instrumented system to which the instrumented functions belong.
SIL Assessment Methods
You can use the following methods to assess the SIL value for an instrumented system:
You can use more than one assessment method to determine the SIL value for an instrumented function. The list of SIL assessments performed on the instrumented function are listed in the SIL Assessment section of the Instrumented Function workspace. However, you can associate only one SIL Assessment with the Instrumented Function.
Copyright © 2018 General Electric Company. All rights reserved.