Verify SIS scope and SIL allocation against P&IDs.
Functional safety auditors do not trust spreadsheets. They want to walk a P&ID, find a SIL-classified tag, and trace it through the SRS, the proof-test record, and the as-built loop folder without the trail going stale between drawings.
Three drawings included on a new account.
How it works.
- 01Extract the full instrument scopeRun the P&ID set through Tagsight as you would for any I/O list extraction. The extraction does not pre-judge SIS scope. That comes next.
- 02Filter the SIS subsetThe drawings give you a candidate list of safety instruments. Confirm each candidate against the safety requirements specification, the cause and effect matrix and the shutdown logic before it becomes the SIS instrument inventory.
- 03Reconcile against the SRS and proof-test registerCross-reference the SIS instrument inventory against the safety requirement specification and the proof-test schedule. Surface tags that have a SIL allocation but no proof-test entry, or proof-test entries pointing at tags that no longer exist.
What you get.
- Filtered SIS instrument inventory with SIL allocations carried through
- Proof-test reconciliation report, allocations without tests, tests without allocations
- SRS-referenced loop folder data per SIS function
- Audit trail per tag. Source P&ID page, source region, review decisions
Common questions
Does Tagsight assign SIL.
No. SIL assignment is a process safety responsibility per IEC 61511, ISA 84, owned by the operating company. Tagsight extracts the tag as drawn. SIS membership and the SIL allocation come from the safety documents and the SRS.
Can the SIS dataset be exported separately from the BPCS dataset.
Yes. SIS and BPCS instruments stay distinguishable in the registers, so the two lists can be issued separately. The SIS list is the candidate set your functional safety engineer confirms against the safety requirements specification, and keeping it separate makes the scope boundary visible in the documentation.
Put it to work.
Functional safety auditors do not trust spreadsheets. They want to walk a P&ID, find a SIL-classified tag, and trace it through the SRS, the proof-test record, and the as-built loop folder without the trail going stale between drawings.
Three drawings included on a new account.