A Functional Safety Assessment (FSA) is defined as an investigation, based on evidence, to judge the functional safety achieved by one or more SIS and/or other protection layers. exida has become recognized as the global leader in functional safety certifications with a strong global acceptance and a growing base of technology. In addition, exida is ANSI accredited to ISO/IEC 17065, the general requirements for bodies operating product certification systems.
The Stage 5 FSA, is defined to occur after modification and prior to decommissioning of a SIS. Thought this Stage 5 FSA is not mandatory per the IEC 61511 standard, it is essential to make sure that modifications are implemented correctly. Strictly speaking if one would follow the safety lifecycle, a modification would trigger a stage 1, 2, or 3 FSA, however depending on the size of the change, one could argue that combining all 3 into a single assessment as suggested by the Stage 5 FSA is more practical. Part of the Stage 5 FSA, is the review of operational experience (Stage 4) as well as impact analysis documenting the required modification.
exida functional safety assessors have for many years performed numerous Functional Safety Assessments with scopes ranging from small skids and turbomachinery to complete plants. In many cases, the exida FSA report is the proof our customers need to satisfy local authorities with regard to the functional safety achieved. The exida FSAs are a combination of procedural and evidence documentation review and an in person physical inspection. exida’s tool based approach ensures comprehensive, efficient, and timely results.
Using a third party independent assessor removes bias and ensures an honest assessment of the state of your functional safety standard compliance. Our customers praise us for our thoroughness, knowledge, and real life practical understanding.