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Overview
Companies do not achieve compliance with safety standards just by in-stalling a certified safety instrumented system (SIS). Full compliance requires ensuring safety on a continuous loop-by-loop basis. SIS users per-form some sort of hazard and risk analysis before installing their safety systems. However, many still fail to audit their safety protection adequately after SIS installation 
and commissioning. The safety standards require users to have competent, certified personnel audit their systems following installation and then on a regular periodic basis.
Many regulatory bodies consider this process, which is detailed within the IEC61508/ISA84 standards, to be an industry best practice. With fines and even criminal convictions at risk, manufacturers and other industrial organizations should make serious efforts to ensure that their safety systems are current. This is one area where ignorance is no longer bliss.
The Directive for Safety Compliance
Since the publication of IEC 61508 and IEC 61511 standards, interest in rigorous safety analysis and applying certified safety instrumented systems have increased considerably among the user community. The safety standards give guidance on good practice and offer recommendations, but do not absolve its users of responsibility for safety. The standards recognize that safety cannot be based on retrospective proof but must be demonstrated in advance. Therefore, the standards not only deal with hazard and risk analysis and specifying safety system requirements, but with the whole safety lifecycle. This includes validation of the installed system, operation and maintenance, and final decommissioning. Thus, the standard deals with the management of safety throughout the entire life of a system.
The standards require evidence of competence for those who perform assessments, but do not require that they be formally authorized or accredited. However, SIS users increasingly demand that the assessments be completed by competent and certified individuals or organizations.
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Keywords: IEC 61508, IEC 61511, Process Safety Standard, ISA84, Lifecycle Management, SIS, Staff, ARC Advisory Group.