Functional Safety Assessment (Cross Cutting)
We run the Stage 1 through Stage 5 functional safety assessment audits to IEC 61511 clause 5 for independent integrity assurance
What this element is and why it matters
The functional safety assessment is the independent audit cycle that proves your safety instrumented system meets its target safety integrity level through design, installation and operation. To IEC 61511 clause 5 the assessment is carried out at five lifecycle stages, namely Stage 1 after the hazard and risk assessment, Stage 2 after design, Stage 3 after installation, Stage 4 every three to five years during operation and Stage 5 after any modification.
Individual significance for organisations
The functional safety assessment is how your organisation discovers whether the safety instrumented system genuinely achieves what it claims. Facilities with rigorous assessment programmes catch systematic failures before they show up in a real demand event, while sites without it operate on faith, and our team makes sure yours never has to.
Contribution to Functional Safety Lifecycle Implementation
The assessment validates the output of every lifecycle phase and feeds the findings back into management of change for corrective action. It also provides the independent evidence that your regulators, insurers and corporate audit function require.
What compliant execution looks like
How we implement this element
A focused six step methodology calibrated to deliver functional safety assessment (cross cutting) as a working capability rather than a documented compliance artefact.
We define the cadence across Stages 1 through 5, specify the assessor competence through TUV, exida or SIRA certification and document the procedures.
We select an independent assessor through internal rotation, a third party such as TUV, exida or DNV, or a certification body, and we verify competence.
At each stage we review the phase outputs, interview the personnel and walk down the installation, and we document the findings against the template.
We categorise by severity into critical findings that need immediate correction, major findings with a target date and minor findings for improvement, and we align them with the corrective action database.
We track to closure against the target date, verify effectiveness and escalate any systematic pattern to functional safety management.
We issue the assessment report for each stage and retain the records to paragraph m subparagraph 6 of OSHA PSM and your corporate requirements.
Element implementation flow chart
A decision gated workflow that shows the actual sequence of activities from initiation through steady state operation, with key decision points highlighted.
What we produce
- An assessment programme charter with the stage definitions
- An assessment report for each stage
- Corrective action tracking with closure verification
- Stage 1 through Stage 5 checklists mapped to the IEC 61511 clause 5 requirements
- Assessor competence and independence evidence for each stage
- An integrity verification review record covering the average probability of failure and the Route 1H or 2H constraints
Where execution fails
- The same assessor used for repeated stages, which loses independence
- Findings categorised inconsistently across the stages
- Closure verification quietly skipped
- Stage 2 or Stage 3 signed off without an independent re check of the probability of failure claims
Codes this element is built on
Explore related elements in this framework
Functional Safety Lifecycle Implementation full element index
Talk to us about implementing Functional Safety Assessment (Cross Cutting)
We can scope this element implementation against your facility, regulatory context, and existing management system maturity, then integrate it with the other Functional Safety Lifecycle Implementation elements you already operate.