Calculations for verifying a Safety Instrumented Function (SIF) with Safety Integrity Level (SIL) performance requirement are standard in the process industry these days. You will find examples in both the IEC 61508 and IEC 61511 standards and Functional Safety (FS) training courses like those available ...

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Ever wondered how to proof test a safety instrumented system?  Proof test is a term that was first coined in the original IEC 61511 standard (functional safety - safety instrumented systems for the process industry sector). Unlike regular testing to see if a system performs ...

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Operation and maintenance procedures for Safety Instrumented Systems (SIS) will vary from company to company. However, there are some specific requirements that need to be covered for safe continued operation. The first blog on this topic discussed general operation and maintenance (O&M) requirements for sustaining ...

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