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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If you own or operate any electrical / electronic or programmable system that has safety functions with a SIL (safety integrity level) rating, then you need to conduct periodic functional safety audit or FSA 4.I hear you say, "functional safety audits and functional safety assessments ...

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For the third blog of this series, the focus is on proof testing. This article will look at what proof testing is, why it's needed, and give some outline examples of proof test procedure requirements.What is "proof testing" and why is it needed?The term "proof testing" ...

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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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How do you ensure a Safety Instrumented System in operation will maintain its original design integrity for a lifetime of 15+ years?The IEC 61511 (2016) safety life-cycle provides some brief guidance for operation and maintenance of a safety instrumented system (SIS) in clause 16. The ...

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Hazardous process industry sites must carry out periodic functional safety assessment (FSA) of safety instrumented systems. But why? Many hazardous process industry sites have viewed Functional Safety Assessment (FSA) as a project activity to be completed when a new safety instrumented system (SIS) gets installed, ...

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