Functional Safety

Functional Safety Assessment 4

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 4 FSA, is defined to occur after gaining experience in operating and maintenance. The Stage 4 FSA is mandatory per the IEC 61511 standard. The objective of this FSA is to ensure that the assumptions made during the analysis and design phases of the safety lifecycle are correct, i.e. are the hazard demand frequencies as estimated, are the SIF equipment failure rates as predicted, are the various layers of protection as effective as assumed, etc. In addition this is a good time to review if the assumed proof test frequencies during the conceptual design are maintained and if all test results are adequately documented. 

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.

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