The SIL Compliance document shall demonstrate that the instrumented safety functions comply with the SIL requirements presented in the SRS.
There are three main requirements, for each safety function, that shall be complied with;
– Quantitative requirements
– Architectural constraints (redundancy)
– Avoidance and control of systematic faults
It is necessary to document compliance with these requirements.
A SIL compliance report is often developed in several iterations throughout a project. In the initial phases the intention is to demonstrate that the requirements are likely to be met. Any deviations should be presented to the project as early as possible.
In later phases the intention is to show compliance given the equipment specific reliability data.