FeatureBuilt · in the lab
LOPA and SIL
Protection layers and SIL verification.
Use this add-on:
Screenshots and a short video come with the listing (AL.3).
Overview
Planned. This add-on is not built and no host app mounts it. LOPA and SIL is planned (roadmap row CH.15) to take scenarios from HAZOP rows, add initiating-event frequencies and independent protection layers, and verify a safety instrument function with PFDavg for common voting architectures and proof-test intervals, using IEC 61511 arithmetic. A library for the arithmetic exists in the lab; no app uses it yet.
Who it’s for
- Process safety and functional safety engineers.
- Instrument engineers who verify safety instrument functions.
- Teams who want scenarios to flow from the HAZOP without retyping.
What you can do
- Nothing works yet. Planned: a scenario product of initiating frequency and protection layer failure probabilities, the gap to a target, the required reduction, and PFDavg for 1oo1, 1oo2, 2oo2, 1oo3 and 2oo3 voting with a common-cause factor (CH.15).
Methods and standards
Planned: the layer-of-protection product and the simplified PFDavg closed forms, with an exact time-average check. The library notes that detected-failure terms and architectural constraints are not covered.
Data and sources
You supply every frequency, failure probability, failure rate, proof-test interval and target. None is bundled; missing inputs are listed. The roadmap names failure data as user-supplied (IND.7).
Verification
Planned: no add-on test yet. The engine library behind it has a test, tools/process-test/test-safety.mjs, which the session log chem-safety_PART_3 records as 151 passed, 0 failed on 2026-10-28. It checks the library's arithmetic and file handling, not an add-on, and not against a worked example from a published guideline. The log lists the SIL bands and the simplified PFDavg equations as typed constants not yet confirmed.
Limits
Not built: high-demand PFH, detected-failure and repair terms, architectural constraint tables, protection layer credit rules, event trees, and any worksheet screen. A result is a study aid for a functional safety engineer, not a certified SIL assessment.
Files and formats
Planned: scenarios kept with the HAZOP worksheet in the drawing or project. No file is written today.
Get started
- Nothing to open yet. The add-on is planned and cannot be added.
- Watch the roadmap row named in this listing for when it is built and enters the lab.
Languages
No languages are listed for this add-on yet. Its maker may add some.
Works in
| Edition | Works | Note |
|---|---|---|
| Browser (/use) (yours) | Added on demand | Fetched the first time you use it, then kept for offline use. |
| Studio from getcadcraft.com | Added on demand | Fetched the first time you use it, then kept for offline use. |
| Microsoft Store | Added on demand | Fetched the first time you use it, then kept for offline use. |
| Google Play | Added on demand | Fetched the first time you use it, then kept for offline use. |
| iPad and iPhone (App Store) | Included; switch it on | Part of the reviewed app; your list switches it on. |
| Custom build | Added on demand | Fetched the first time you use it, then kept for offline use. |
Comes with
- HAZOP and What-If Size when built
- P&ID 3.3 MB
- Schematics and connectivity 800 KB
- Risk and reliability 400 KB
- P&ID 3.3 MB
- Risk and reliability 400 KB
Adding it brings these too. Engines are shared: each downloads once for every add-on that uses it.
Needed by: Instrumentation and control engineering, Process safety engineering.
Versions
| Version | Channel | Date | What changed |
|---|---|---|---|
| 1.0.0 | lab | October 31, 2026 | First version in the Library. |
Licence and maker
CadCraft (CadCraft, first-party). Licence: Apache-2.0. Dependencies carry their own licences, listed on their pages.