FAT, SAT, loop testing, end-to-end validation per IEC 61511 Cl.13-15
Phase 5 installs the designed SIS, commissions it through Factory Acceptance Test (FAT) and Site Acceptance Test (SAT), and validates end-to-end per IEC 61511 Cl.13-15. Validation confirms each SIF performs its function per the SRS before introduction of highly hazardous chemicals.
Phase 5 catches the design-vs-built gap. Sites with rigorous validation discipline avoid the typical 'commissioned but never tested end-to-end' pattern that surfaces only during real demand events.
Phase 5 closes the design loop (Phases 3-4) and opens the operational loop (Phase 6). The validation evidence is also the foundation for the FSA Stage 2/3 audit and the PSSR before chemical introduction.
A focused 6-step methodology calibrated to deliver installation, commissioning, validation as a working capability — not a documented compliance artefact.
Author FAT covering every SIF cause-and-effect, voting combination, override scenario, and bypass logic.
Execute at vendor facility with FSE / TÜV / exida witness; document deviations and resolution.
Verify site installation matches design — cabling, segregation, redundancy, environmental ratings.
Site Acceptance Test with end-to-end loop testing; sensor → logic → final element actuation verification.
Confirm each SIF performs function per SRS; document validation evidence per Cl.15.2; align with PSSR before HHC introduction.
Independent FSA Stage 3 (post-installation, pre-operation); resolve findings; hand to Phase 6 operations.
Decision-gated workflow showing the actual sequence of activities — from initiation through steady-state operation — with key decision points highlighted.
We can scope this element implementation against your facility, regulatory context, and existing management-system maturity — and integrate it with the other Functional Safety Lifecycle Implementation elements you already operate.