![]() ![]() ![]() We wanted to provide an informational video and quick guide to help our industry use SIL,” says Jason Aldrich, product manager at SOR. “Many customers are now requiring SIL certified products, as safety is essential. IEC 61508 and IEC 61511 both have tables with the Safety Integrity Levels associated with Probability of Failure, Risk Reduction Factor, Hardware Fault Tolerance and Architecture.SIL certification identifies all process hazards, estimates the risk of failure and determines that if a failure occurs that the product will “fail safely.” Every component in an instrument must be examined and verified in respect to these criteria in order to comply with the SIL restrictions. For SIL 4, IEC 61511 refers the user back to the detail in IEC 61508. IEC 61511 only defines requirements for SIL 1 to SIL 3, as it is expected that SIL 3 will be a maximum level in the process sector (excepting Nuclear). SIL 4 has the highest safety integrity and SIL 1 the lowest. It is a discrete level (one out of four) for specifying the safety integrity requirements of the safety instrumented functions to be allocated to the safety instrumented systems. Defining a target SIL level for the process should be based on the assessment of the likelihood that an incident will occur and the consequences of the incident. SIL – Safety Integrity Level – is a quantitative target for measuring the level of performance needed for a safety function to achieve a tolerable risk for a process hazard. ![]() We'll start with some more general terms and descriptions and make our way to more advanced material. In the following series of blogs, we'll go back to basics and run down everything you need to know to get started in functional safety. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |