Prepare a SIL evidence package.
From the SIS scope on the P&ID to the IEC 61511 audit evidence package
Preparing a SIL evidence package is the IEC 61511 / ISA 84 functional safety process of assembling every artifact the SIL audit reviews: the SIF list (every safety instrumented function on the facility), the SIL determination (target SIL per SIF, typically from LOPA), the SIL verification (achieved SIL per SIF from the actual sensor / logic-solver / final-element architecture), the SIS scope on the P&ID with voting architecture preserved, the cause-and-effect matrix, the SIS proof-test schedule, and the SIS impairment history. The SIL evidence package is the document the third-party auditor reviews against IEC 61511 clauses 5-7.
Inputs.
- +P&ID set (for SIS scope extraction)
- +HAZOP study (for SIF identification scope)
- +LOPA worksheets (for SIL target per SIF)
- +SIL verification calculation report (from exida exSILentia, SIS-PRO, or equivalent)
- +SRS (Safety Requirements Specification)
- +Cause-and-effect matrix
- +FAT and SAT records
Outputs.
- →SIF list with target SIL, achieved SIL, voting architecture per SIF
- →P&ID SIS subset filtered from the extraction (PSH, PSL, PALL, PAH, PSV, ZSO, ZSC, XV tags)
- →Cause-and-effect matrix in structured form
- →Voting architecture per SIF preserved as drawn
- →Cross-walk between SIF list, SIL verification, P&ID SIS subset, and cause-and-effect matrix
- →Audit-ready PDF binder + Excel workbook + JSON for the IEC 61511 review
| Clause | Evidence required | Source artifact |
|---|---|---|
| 5.2 SIF identification | SIF list with hazardous event scope | HAZOP + LOPA outputs |
| 5.2 SIL target | Risk reduction target per SIF | LOPA scenario set |
| 6.3 SRS | Safety Requirements Specification per SIF | SRS document, P&ID references |
| 6.4 SIS architecture | Sensor + logic solver + final element per SIF | P&ID extraction with voting |
| 7.3 SIL verification | PFDavg + RRF per SIF, voting included | SIL verification calculation |
| 7.7 SIS validation | FAT and SAT verification records | Commissioning records |
| 8.2 Proof test | Per-SIF proof-test interval + history | Operations records |
Step by step.
- 01
Extract SIS scope from the P&ID
Filter the extracted instrument list to SIS-classified tags using the signal class plus SIS tag prefix. Voting architecture per SIF preserved.
- 02
Cross-walk with the SIF list
Every SIF on the SIF list ties to its SIS instruments on the P&ID. SIS instruments not tied to any SIF flag for review (scope drift).
- 03
Pull the SIL verification
Per-SIF target SIL, achieved SIL, PFDavg, RRF, voting architecture, and proof-test interval populate from the verification report (exida exSILentia, SIS-PRO, Sphera).
- 04
Reconcile with the cause-and-effect matrix
Every SIF action on the cause-and-effect matrix ties to the SIL-verified SIF. Cause-and-effect rows without a corresponding SIF flag for review.
- 05
Assemble the SRS evidence
Per-SIF SRS sections cross-reference to the P&ID page, the SIL verification row, and the cause-and-effect matrix entry. The traceability that IEC 61511 6.3 requires.
- 06
Ship the evidence package
PDF binder + Excel workbook + JSON. The third-party auditor reviews against IEC 61511 clauses 5-7 using the same package.
Common questions.
Does this produce the SIL determination?
No. The SIL determination is the LOPA output that sets the target SIL per SIF. The SIL determination calculation stays in your validated process-safety package; the SIL evidence package carries the determination as input, not as output.
Are exida exSILentia, SIS-PRO, and Sphera SafeTech calculation reports supported?
Yes. All three calculation tools produce SIL verification reports in the column shape Tagsight extracts. Tool-specific metadata (component reliability database references, mission-time assumptions) preserves in a tool-source column.
Start a workspace.
Upload the source documents, run the workflow, ship the document in the column shape the next consumer expects.