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 are not a requirement, our installation pre-dates these new-fangled standards!”. Read

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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” was first introduced in the  IEC 61511 [1] standard when

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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 the integrity of a SIS. This second article discusses the requirements

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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 stated objectives are to ensure that the validated system’s safety

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