Prepare a SIL evidence package.
From the SIS scope on the P&ID to the IEC 61511 audit evidence package
What this covers.
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 plus Excel workbook plus JSON for the IEC 61511 review
IEC 61511 SIL evidence by clause
| Clause | Evidence required | Source artifact |
|---|---|---|
| 5.2 SIF identification | SIF list with hazardous event scope | HAZOP plus 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 plus logic solver plus final element per SIF | P&ID extraction with voting |
| 7.3 SIL verification | PFDavg plus 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 plus history | Operations records |
Step by step.
- 01Extract SIS scope from the P&IDFilter the extracted instrument list to SIS-classified tags using the signal class plus SIS tag prefix. Voting architecture per SIF preserved.
- 02Cross-walk with the SIF listEvery 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.
- 03Pull the SIL verificationPer-SIF target SIL, achieved SIL, PFDavg, RRF, voting architecture, and proof-test interval populate from the verification report, exida exSILentia, SIS-PRO, Sphera.
- 04Reconcile with the cause-and-effect matrixEvery 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.
- 05Assemble the SRS evidencePer-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.
- 06Ship the evidence packagePDF binder plus Excel workbook plus JSON. The third-party auditor reviews against IEC 61511 clauses 5-7 using the same package.
Common questions
Does this produce the SIL determination.
Are exida exSILentia, SIS-PRO, and Sphera SafeTech calculation reports supported.
Related.
Start a workspace.
Upload the source documents, run the workflow, ship the document in the column shape the next consumer expects.