[AI-Assisted] Add fresh comparesimulations2 PFD and P&ID workflow

[EvenSol]

Scope

Publishes the user-prioritized separation/compression visual-review workflow from comparesimulations2.ipynb, using the NeqSim engineering-diagram implementation merged as 653db71353dc3a5a0fad92b945978fd0bd94e74a.

This draft deliberately preserves the notebook's comparison, optimization, and historical-output content. It adds an exact-core bootstrap, a fresh PFD workflow, and a graphically distinct P&ID proposal from the same canonical runnable plant.

Model reconciliation

• Corrects the LP oil recycle label.
• Names two numerical dew-point recycle streams and their Recycle utilities so the solved model and diagrams remain reproducible.
• Treats those recycles only as numerical convergence utilities, not fabricated physical equipment.
• Does not add 24-VB-01; that vessel appears in the historical illustration but is absent from the runnable getprocess() model.
• The P&ID proposal is an educational engineering register layered over the canonical simulated topology, not a completed safety or construction design.

Fresh retained evidence

• Clean sequential execution: 34/34 code cells, zero exceptions, zero error outputs, zero stderr.
• Preserved calculated figures plus four A1-landscape PFD SVG sheets and four A1-landscape P&ID SVG sheets.
• Both profiles also produce four-page A1 PDFs.
• Completed-scene validation: 14 PFD warnings, 413 P&ID warnings, and zero errors; whole-sheet visual acceptance is blocked.
• Independent reconstructed-and-solved regeneration: 29/29 files byte-identical.
• Shared topology fingerprint: 47a2e6d7a3331f1ea2717b018e28977d943450bbe8130409d2401d223358ccc6.
• PFD PDF SHA-256: a8ce98adc76ebd0be59a3b3fa59d7e7df5dc3dd1949b6dee7baf5a7372d7eaee.
• P&ID PDF SHA-256: ff5f7a29a33c0ea734a7950d4d6701143739fa3e2aee6c53468a9bbe32b4bc6a.
• Core JAR SHA-256: 8b2eeb94e972e0c30467ad9c4f99f299b5fe9eec57b55f0e4ff4dd5896ec6704.

Scientific checks retained

• Base mass-balance residual: 0.000076%.
• 100-case sweep worst mass-balance residual: 0.003330%, within the notebook's 0.01% gate.
• Direct and surrogate optimization paths complete.
• Parallel demonstrations are re-qualified deterministically before their strict equality checks.

Visual QA

All eight fresh sheets were inspected at whole-sheet scale and at 200 dpi. The controlled sheet index, PFD/P&ID distinction, tagged vector symbols, process/recycle routes, flow arrows, line identity, area boundaries, P&ID proposal racks, instruments, valves, and signal lanes are present. Completed-scene diagnostics and visual inspection confirm off-page-label, route, instrument, valve, symbol and physical-attachment crowding; these defects block whole-sheet acceptance.

Exchange and claims boundary

Native DEXPI 2.0 Process/PFD and Plant/P&ID outputs remain distinct from the Proteus 4.1 compatibility companion. This work is standards-aligned where supported by the implemented requirements; it does not claim ISO/ISA conformance, certification, engineering approval, construction readiness, or safety credit.

Authoritative catalogue check on 2026-09-09 confirms ISO 10628-1:2014 remains current after ISO's 2026 review, ISO 10628-2:2012 remains current after its 2024 review, and ANSI/ISA-5.1-2024 is ISA's latest symbols-and-identification edition. ISA also lists the relevant ISA-TR5.1.04-2026 guidance for PFD/P&ID content.

Still review-required: governed project metadata, engineering-register values, accountable visual baselines, licensed ISO 10628-1/-2, ANSI/ISA-5.1:2024, and ISA-TR5.1.04-2026 text review, plus named-CAE DEXPI/Proteus round-trip qualification. Missing project metadata includes line classes/specifications, design pressure/temperature, materials, valve failure positions, instrument ranges, alarm/trip set points, hazardous-area data, relief sizing/disposal, drain/vent destinations, revision approvals, and discipline sign-off.

Validation

• python scripts/check_notebook.py notebooks/process/comparesimulations2.ipynb --ledger notebooks/notebook_maintenance_ledger.json
• python -m pytest scripts/test_check_notebook.py
• python scripts/execute_notebook_inprocess.py notebooks/process/comparesimulations2.ipynb
• jupyter nbconvert --to html notebooks/process/comparesimulations2.ipynb
• JSON parse and git diff --check

Draft only. Do not merge or mark ready until the review/publication gates are satisfied.

Roadmap: equinor/neqsim#1332 and equinor/neqsim#2899.

Prior-head CI history

On the earlier notebook head, four of five workflows passed. The repository-wide CO₂ low-temperature workflow failed twice while executing its unchanged notebook against NeqSim source 1d4fcc111b7e80dee49cd0941d8317029b943296. Both attempts reproduce EOS-CG detects nominal two-phase state at 25 C: False; the cell's other eleven displayed scientific assertions pass.

This out-of-diff phase-behavior dependency predates this PR and is tracked in NeqSim-Colab #151. It is not addressed here because doing so would expand the frozen PFD/P&ID concept into unrelated thermodynamics work.

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Subsequent visual review — 2026-09-10

equinor/neqsim#3619 inspected the exact retained notebook outputs and found whole-sheet acceptance defects that the current zero-warning diagnostics do not cover: incorrect serial topology in the teaching block overview, clipped/hidden overview connectors, endpoint-envelope route traversal, border excursions, duplicate rendered routes, generic symbol/typography limitations, unbound P&ID proposal placement, displayed sheet-order errors, and incomplete exchange coverage for visible P&ID elements.

Accordingly, these artifacts remain deterministic, fresh teaching/review evidence, but they are not accepted professional BFD/PFD/P&ID drawings. The draft remains blocked from ready/merge. Issue #3619 is adopted as the next coherent shared-lane follow-up after this active draft is resolved; no overlapping implementation PR is started while #156 remains open.

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Core-prerequisite dependency update — 2026-09-10

Following the explicit #3619 fix request, core equinor/neqsim draft #3642 now owns the prerequisite topology, sheet-order, routing and completed-scene-diagnostics correction at exact head ace1693445597db57667b6cf4c5526bacee3728a. This notebook PR remains frozen at 308fd1e690eac4d188275c2e862b9d3d6ee6f1fd; it is not replaced, rebased or abandoned.

GitHub currently reports this draft non-mergeable. No branch change was made. Publication stays blocked until the core prerequisite is accepted and available, these notebook outputs are regenerated and re-inspected, the existing CO₂ dependency is resolved or governed, and the remaining engineering/interop gates close.

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Merged #3619 core prerequisite — 2026-09-10

• Core PR #3642 merged externally on September 10, 2026 as 653db71353dc3a5a0fad92b945978fd0bd94e74a, preserving source head ace1693445597db57667b6cf4c5526bacee3728a.
• All ten exact-head workflows passed, including Java 8/21 on Ubuntu and Windows, all four slow shards, Javadocs, both notebook workflows, CodeQL, documentation, formatting, pre-commit, performance and PaperLab. All six review threads remain resolved.
• Delivered core prerequisite: canonical BFD partition/topology, controlled sheet order, duplicate-continuation suppression, flow-aware port routing and completed-scene diagnostics.
• This is not whole-sheet acceptance: the merged reference still records 14 PFD and 413 P&ID completed-scene warnings. Reviewed symbols/typography, physical P&ID attachments, printed stream identities/tables, exchange projection/coverage and independent DEXPI/Proteus round trips remain open.
• Downstream NeqSim-Colab draft #156 remains exact-head at 308fd1e690eac4d188275c2e862b9d3d6ee6f1fd, open, draft, unrebased and unmodified. GitHub reports it non-mergeable; no branch disturbance occurred. Its next permitted action is same-branch clean regeneration and whole-sheet reinspection against the merged core prerequisite.
• 24-VB-01 remains absent. No conformance, certification, safety, construction or engineering-approval claim is made.
• Portfolio occupancy is 8/10.

Status: CORE PREREQUISITE MERGED AND EXACT-HEAD CI COMPLETE — DOWNSTREAM NOTEBOOK REGENERATION AND WHOLE-SHEET ACCEPTANCE BLOCKED.

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Exact merged-core notebook regeneration — 2026-09-10

• Downstream NeqSim-Colab draft #156 advanced on its existing branch to exact head b05f0b5, with 308fd1e690eac4d188275c2e862b9d3d6ee6f1fd preserved as its parent. The draft remains open, unmerged and not ready for review.
• The notebook now builds/runs merged core source 653db71353dc3a5a0fad92b945978fd0bd94e74a; retained provenance records JAR SHA-256 8b2eeb94e972e0c30467ad9c4f99f299b5fe9eec57b55f0e4ff4dd5896ec6704.
• Clean retained execution completed 34/34 code cells with sequential counts, no exceptions, no error outputs and no stored stderr. Notebook integrity reports zero errors/warnings; MathJax-compatible HTML conversion succeeds. Notebook SHA-256 is 04d572cf4671c52a3c18f1dfad27f3d1212273c5297f5854b7e690a7970b4561.
• Both profiles regenerated from the same canonical solved process fingerprint 47a2e6d7a3331f1ea2717b018e28977d943450bbe8130409d2401d223358ccc6: four A1 SVG sheets plus a four-page A1 PDF for PFD, and four distinct A1 SVG sheets plus a four-page A1 PDF for the P&ID proposal. All 29 current delivery files match an independent reconstruction byte-for-byte.
• Every sheet was inspected at whole-sheet and 200 dpi detail scales. The completed-scene gate now reports zero errors but 14 PFD warnings (9 text/route, 5 text/text) and 413 P&ID warnings (307 text/route, 77 proposal/route, 16 text/text, 11 text/symbol and 2 signal/object). The inspection confirms the flagged off-page-label, route, instrument, valve and attachment crowding. This exact evidence supersedes earlier zero-warning/visual-acceptance wording.
• Sheet 1 is explicitly a controlled sheet index, not process connectivity. The PFD/P&ID sheet order is process index, separation/oil export, recompression/dew point, then fuel split/gas export.
• DEXPI 2.0 Process, native DEXPI 2.0 Plant/P&ID and Proteus 4.1 compatibility companions remain separately labelled. Named-CAE round-trip qualification remains open.
• 24-VB-01 remains absent from the runnable model and generated deliveries; no equipment was invented. Dew-point recycle objects remain disclosed numerical utilities.
• Accountable project metadata, governed visual baselines, reviewed symbols/typography, physical P&ID attachment disposition, engineering-register review, licensed-text review and discipline approval remain open.
• Portfolio occupancy is 8/10.

Status: EXACT-HEAD NOTEBOOK REGENERATION PUBLISHED IN DRAFT — CI PENDING; WHOLE-SHEET VISUAL ACCEPTANCE BLOCKED BY RETAINED COMPLETED-SCENE DEFECTS.

No merge, rebase, ready transition, conformance claim, certification, safety credit, construction fitness or engineering approval was performed or asserted.

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Repository-ledger synchronization — 2026-09-10

• The existing three-file scope is preserved at exact head b05f0b5.
• Both maintained ledger files now record merged core 653db71353dc3a5a0fad92b945978fd0bd94e74a, JAR SHA-256 8b2eeb94e972e0c30467ad9c4f99f299b5fe9eec57b55f0e4ff4dd5896ec6704, 34/34 clean cells, 29/29 byte-identical delivery files, and the fail-visible 14 PFD / 413 P&ID warning split.
• JSON validation, notebook-ledger validation, six ledger unit tests, and whitespace validation pass. Whole-sheet acceptance remains blocked.

Current exact-head CI state — 2026-09-10

GitHub reports no workflow runs yet for exact head b05f0b5ac8335853116a515035f3cdfe56284553; exact-head CI therefore remains pending and no hosted check is claimed as passed. The PR has no review threads, remains draft/open/unmerged, and is reported non-mergeable. No rebase or branch disturbance was performed.

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Runnable-model teaching overview correction — 2026-09-11

• Advanced this existing draft branch, without rebase or replacement, to exact head 2bbb04c. The three-file scope is unchanged.
• Replaced the executed teaching overview's false serial Cold process → Gas export → Oil export presentation with separate oil-export, fuel-gas and sales-gas branches plus two recycle paths. The cell now asserts eight aggregate connections against the freshly exported runnable-model DOT graph and displays their evidence mapping.
• Preserved all 56 pre-existing cells, 16 substantive examples and seven calculated figures, including the historical Graphviz output. 24-VB-01 remains absent and was not fabricated.
• Clean exact-core execution passed 34/34 code cells and 59 assertions with zero exceptions, error outputs or stderr. Notebook SHA-256: 15e1429f379f7c2b9ea29525a19292d6a0cc9fb38bf40b084dddbce7d51f2b21.
• Both four-sheet A1 profiles and their PDFs regenerated; all 29 delivery files matched an independent reconstruction byte-for-byte. PFD/P&ID PDF hashes remain a8ce98a… / ff5f7a2….
• Whole-sheet acceptance remains blocked: completed-scene diagnostics still report 14 PFD and 413 P&ID warnings, zero errors. The fresh PDFs were re-rendered at whole-sheet and 200 dpi detail scales.
• Scientific gates pass, but full exact-runtime reruns produced different feasible random-forest surrogate candidates despite fixed seeds. The final retained candidate is 9430.9342 kW at 10.5094 psia and the held-out R² is 0.796. Diagram byte stability is therefore claimed separately from surrogate-candidate repeatability.
• GitHub reports no workflow runs or statuses yet for this exact head; exact-head CI remains pending. There are no review threads. The draft remains open, unmerged, not ready, and reported non-mergeable.
• Portfolio occupancy remains 8/10. No conformance, certification, safety, construction-fitness or engineering-approval claim is made.

Status: EXECUTED TEACHING OVERVIEW TOPOLOGY CORRECTED — EXACT-HEAD CI PENDING; WHOLE-SHEET VISUAL ACCEPTANCE BLOCKED.

Base-continuity note — 2026-09-11

After exact-head publication, master advanced to f4e5a0156c413557d3a77be8ed716643856fcf3f. GitHub compares this draft as diverged, seven commits ahead and three behind, and reports it non-mergeable. Per the campaign's exact-head/no-rebase rule, the branch remains unchanged; no rebase, merge, closure, replacement or ready transition was attempted.

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Base-continuity update — current master 67e4453

NeqSim-Colab master advanced from f4e5a0156c413557d3a77be8ed716643856fcf3f to 67e4453ed4ac25659c13db207119ff770d6218d8 through four commits. The new base delta adds the CO₂-hydrate/brine teaching notebook and catalog evidence and also changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and seven behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 17d6b3f

NeqSim-Colab master advanced from 67e4453ed4ac25659c13db207119ff770d6218d8 to 17d6b3f49c00cd0db07c528aa24a44e9fd2423f1 through two commits. The new base delta adds the Open DARTS waterflood teaching workflow and catalog entries and again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and nine behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 55a82aa

NeqSim-Colab master advanced from 17d6b3f49c00cd0db07c528aa24a44e9fd2423f1 to 55a82aa1dbe827f9b9fce597e65a3f5b5194f6c3 through two commits. The new base delta adds the hot-oil commissioning flow-assurance/ML teaching notebook and its README/catalog evidence and again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and eleven behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master ef3b9df

NeqSim-Colab master advanced from 55a82aa1dbe827f9b9fce597e65a3f5b5194f6c3 to ef3b9df814988af1a92e5dc082e30c390d027e26 through two commits. The new base delta merges the mechanical-design-to-3D equipment workflow, with separator/compressor model generation, qualified STL/GLB/JSON exchange, and README/catalog evidence; it again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and thirteen behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 0eb8f6d

NeqSim-Colab master advanced from ef3b9df814988af1a92e5dc082e30c390d027e26 to 0eb8f6d7ea1b679e6b4dd1983f5cd9d518bf1216 through two commits. The new base delta merges the executed AI Asset Team tie-back and debottlenecking workflow with README/catalog evidence and again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and fifteen behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master a70d31b

NeqSim-Colab master advanced from 0eb8f6d7ea1b679e6b4dd1983f5cd9d518bf1216 to a70d31b988342283bcae0ebd10aee986e5b29316 through eight commits. The new base delta merges the executed integrated Norne reservoir-to-facilities workflow using OPM, NeqSim and adaptive ML, together with its reproducible generator, dedicated validation workflow, and README/catalog evidence; it again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and twenty-three behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 103f0f3

NeqSim-Colab master advanced from a70d31b988342283bcae0ebd10aee986e5b29316 to 103f0f332b3cc0bcdb986ea78d01da6deac0e568 through six commits. The new base delta adds the executed centrifugal-compressor sizing/production-optimization and gas-distillation temperature-control notebooks, updates the CO₂ low-temperature notebook and its validation workflow, and adds the associated README/catalog and maintenance evidence; it again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and twenty-nine behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master eebab9f

NeqSim-Colab master advanced from 103f0f332b3cc0bcdb986ea78d01da6deac0e568 to eebab9f8992d58cfc084fda05de0731c7b9e052b through two commits. The new base delta corrects active_notebook_count in notebooks/notebook_maintenance_ledger.json, directly overlapping one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and thirty-one behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 9ce9374

NeqSim-Colab master advanced from eebab9f8992d58cfc084fda05de0731c7b9e052b to 9ce9374fb2f81af34f14df8c3e4e58cba34ed154 through two commits. The new base delta adds the wellstream steady/dynamic multiphase teaching notebook with hydrate and wax screening, together with README/catalog and maintenance evidence; it again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and thirty-three behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 885dfa2

NeqSim-Colab master advanced from 9ce9374fb2f81af34f14df8c3e4e58cba34ed154 to 885dfa25fbbf6ed44fcabedd44e93eff7978802f through two commits. The new base delta adds the NeqSim and Equinor TimeSeriesAnalysis large-process analytics book, together with README/catalog and maintenance evidence; it again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and thirty-five behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 7eb0bac

NeqSim-Colab master advanced from 885dfa25fbbf6ed44fcabedd44e93eff7978802f to 7eb0bac3a1eab0d486ec7c9e24065ac240dbb7cb through two commits. The new base delta expands the NeqSim/Equinor TimeSeriesAnalysis large-process notebook with PlantSimulator feedback and Python binding checks, updates its README/catalog and maintenance evidence, and again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and thirty-seven behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 778ee7e

NeqSim-Colab master advanced from 7eb0bac3a1eab0d486ec7c9e24065ac240dbb7cb to 778ee7eef6ff8709373895fdb355f815ed533262 through three commits. The new base delta adds the fouling thermal-hydraulic preheater rating notebook with catalog and maintenance evidence and again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and forty behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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External closure and base-continuity update — current master 744b98b

NeqSim-Colab draft #156 remains externally closed without merge since 2026-09-15 at 15:42:40 UTC. Its exact head remains 2bbb04c289a2e8636aaaa935edf09f88513e9a48, its three-file scope is unchanged, and it remains marked draft. No source or branch mutation accompanied the closure.

NeqSim-Colab master advanced from ed4f1ec32cebc1482fa6b0260d0aa1390eef8cdb to 744b98b9d4a1cb38f4e4e4dba7e1d1d3ffa24f58 through six commits. The delta adds an executed CO₂-injection well-interface paper companion notebook with README/catalog and maintenance evidence. It again changes notebooks/notebook_maintenance_ledger.json, one of #156's three files. GitHub now compares closed draft #156 as diverged, seven commits ahead and ninety-one behind.

No exact-head workflow runs, commit statuses, or review threads have appeared. The campaign did not reopen, replace, rebase, merge, modify, or mark the PR ready, and did not create a successor shared-lane PR. Publication remains paused pending an explicit safe transition from the external closure. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. The last positively identified portfolio occupancy remains 8/10 pending authoritative reassessment.

External closure and base-continuity update — current master 5062aba

As of September 27, 2026, NeqSim-Colab PR #156 remains closed without merge since 2026-09-15 at 15:42:40 UTC. Its exact head remains 2bbb04c289a2e8636aaaa935edf09f88513e9a48, its three-file scope is unchanged, and it remains marked draft. No source or branch mutation accompanied the closure.

NeqSim-Colab master advanced from 744b98b9d4a1cb38f4e4e4dba7e1d1d3ffa24f58 to 5062aba4962273f58ae6c80cb9997361c611b839 through five commits. The delta adds the executed hydrate-mitigation chemical-choice notebook for NeqSim #4016, its catalog entry, per-notebook validation record, and maintenance evidence. It again changes notebooks/notebook_maintenance_ledger.json, one of #156's three files. GitHub now compares closed draft #156 as diverged, seven commits ahead and ninety-six behind.

No exact-head workflow runs, commit statuses, or review threads have appeared. The campaign did not reopen, replace, rebase, merge, modify, or mark the PR ready, and did not create a successor shared-lane PR. Publication remains paused pending an explicit safe transition from the external closure. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. The last positively identified portfolio occupancy remains 8/10 pending authoritative reassessment.

External closure and base-continuity update — current master dcaaab9

As of September 27, 2026, NeqSim-Colab PR #156 remains closed without merge since 2026-09-15 at 15:42:40 UTC. Its exact head remains 2bbb04c289a2e8636aaaa935edf09f88513e9a48, its three-file scope is unchanged, and it remains marked draft. No source or branch mutation accompanied the closure.

NeqSim-Colab master advanced from 5062aba4962273f58ae6c80cb9997361c611b839 to dcaaab964def43a54747228ca118b1208a0ece88 through nine commits. The delta adds an executed ASE/PySCF/NeqSim lithium-perovskite-hydride study and an executed continuous-agentic compressor live-task notebook, together with README/catalog and validation/maintenance evidence. It again changes notebooks/notebook_maintenance_ledger.json, one of #156's three files. GitHub now compares closed draft #156 as diverged, seven commits ahead and one hundred five behind.

No exact-head workflow runs, commit statuses, or review threads have appeared. The campaign did not reopen, replace, rebase, merge, modify, or mark the PR ready, and did not create a successor shared-lane PR. Publication remains paused pending an explicit safe transition from the external closure. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. The last positively identified portfolio occupancy remains 8/10 pending authoritative reassessment.

Continuity refresh — 2026-09-29 (master 87fae96)

• master advanced two commits from dcaaab9 to 87fae96, merging PR #184 to validate official TimeSeriesAnalysis Python-wrapper parity.
• The delta modifies README.md, notebooks/advanced_analytics/neqsim_timeseriesanalysis_large_process.ipynb, the shared examples catalog, and its maintenance record. The catalog/maintenance overlap is recorded; no PFD/P&ID artifact or frozen-head file changed in this delta.
• PR #156 is now 7 commits ahead and 107 behind master. Its exact head remains 2bbb04c289a2e8636aaaa935edf09f88513e9a48, externally closed, draft, unmerged, non-mergeable, and unre-based.
• No exact-head workflow runs, commit statuses, or review threads appeared. The required 2026-09-07 milestone sections remain present in both #1332 and #2899.
• The campaign did not reopen, replace, rebase, merge, or mark the PR ready, and created no successor shared-lane PR. Publication remains paused pending an explicit safe transition from the external closure. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. The last positively identified portfolio occupancy remains 8/10 pending authoritative reassessment.

Continuity refresh — 2026-10-04 (master d7d5f9d)

• master advanced two commits from 87fae96 to d7d5f9d, merging PR #186 for the executed NeqSim PVT / OPM Flow hydrocarbon phase-evolution demonstration linked to research-scan: 1 paper opportunities found (top score 30) equinor/neqsim#4198.
• The delta adds the executed reservoir notebook and per-notebook validation record and modifies README.md, the shared examples catalog, and notebooks/notebook_maintenance_ledger.json. The shared-ledger overlap is recorded; no PFD/P&ID artifact or frozen-head file changed in this delta.
• PR #156 is now 7 commits ahead and 109 behind master. Its exact head remains 2bbb04c289a2e8636aaaa935edf09f88513e9a48, externally closed, draft, unmerged, non-mergeable, and unre-based.
• No exact-head workflow runs, commit statuses, or review threads appeared. The required 2026-09-07 milestone sections remain present in both #1332 and #2899.
• The campaign did not reopen, replace, rebase, merge, modify, or mark the PR ready, and created no successor shared-lane PR. Publication remains paused pending an explicit safe transition from the external closure. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. The last positively identified portfolio occupancy remains 8/10 pending authoritative reassessment.

Base-continuity refresh — 2026-10-05

• master advanced two commits from d7d5f9d to bc8c96b, merging PR #188 to fix the CO₂-hydrate tutorial for 10 wt% KCl and finite CO₂ inventory.
• The delta modifies the notebook catalog, co2_hydrate_brines_and_drilling_fluids.ipynb, and its maintenance ledger; it does not modify the frozen PFD/P&ID artifacts.
• Draft [AI-Assisted] Add fresh comparesimulations2 PFD and P&ID workflow #156 remains externally closed, draft, unmerged, non-mergeable, and unre-based on exact head 2bbb04c; it is 7 commits ahead and 111 behind master.
• Exact-head workflows, commit statuses, and review threads remain absent. The required #1332/#2899 visual-acceptance milestone text remains intact.
• Acceptance remains blocked by 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

Base-continuity refresh — 2026-10-05 (README title)

• master advanced two commits from bc8c96b to d6f54c6, updating the README title to remove “in Colab”.
• The delta changes only README.md; it does not modify the frozen PFD/P&ID artifacts or shared notebook ledger.
• Draft [AI-Assisted] Add fresh comparesimulations2 PFD and P&ID workflow #156 remains externally closed, draft, unmerged, non-mergeable, and unre-based on exact head 2bbb04c; it is 7 commits ahead and 113 behind master.
• Exact-head workflows, commit statuses, and review threads remain absent. The required #1332/#2899 visual-acceptance milestone text remains intact.
• Acceptance remains blocked by 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

Base-continuity refresh — 2026-10-06

• master advanced four commits from d6f54c6 to 4c2139b, merging PR #189 with Dholabhai hydrate comparisons and salt-specific accuracy discussion.
• The delta modifies the notebook catalog, co2_hydrate_brines_and_drilling_fluids.ipynb, and its maintenance ledger; it does not modify the frozen PFD/P&ID artifacts.
• Draft [AI-Assisted] Add fresh comparesimulations2 PFD and P&ID workflow #156 remains externally closed, draft, unmerged, non-mergeable, and unre-based on exact head 2bbb04c; it is 7 commits ahead and 117 behind master.
• Exact-head workflows, commit statuses, and review threads remain absent. The required #1332/#2899 visual-acceptance milestone text remains intact.
• Acceptance remains blocked by 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

[EvenSol]

Campaign ledger — 2026-09-09

Exact head: 308fd1e690eac4d188275c2e862b9d3d6ee6f1fd
Exact base: 233cc4c434a645dca96ba72915767c1f0b0fffac
Core source: merged df2de508ffff3dbc881bdb6e796fe4bb27627498
State: draft, open, mergeable, unmerged

Evidence

• Remote scope is exactly three files; all remote Git blob SHAs match the clean validated local files.
• Clean retained execution: 34/34 code cells, zero exceptions/error outputs/stderr.
• PFD: four A1 SVG sheets plus four-page A1 PDF.
• Distinct P&ID proposal: four A1 SVG sheets plus four-page A1 PDF.
• Visual inspection: all eight sheets at whole-sheet and 200 dpi scales.
• Renderer: zero warnings/errors for both profiles.
• Independent process reconstruction: 25/25 output files byte-identical.
• Scientific gate: base mass residual 0.000076%; 100-case worst residual 0.003330% ≤ 0.01%.
• Notebook integrity and seismic/RMS workflows pass; three notebook workflows are active with zero reported failures.
• No review threads.
• 24-VB-01 was not added; named dew-point recycles are numerical convergence utilities only.

Open gates

Accountable project metadata and visual baselines; engineering-register review; named-CAE DEXPI/Proteus round-trip qualification; licensed ISO/ISA text review; discipline sign-off. Native DEXPI 2.0 and Proteus compatibility claims remain separate.

Portfolio occupancy: 8/10.

Status: FRESH PFD/P&ID NOTEBOOK EVIDENCE PUBLISHED IN DRAFT — CI AND REVIEW GATES OPEN.

No merge, rebase, ready transition, conformance claim, certification, safety credit, construction fitness, or engineering approval was performed or asserted.

---

Exact-head CI status

• Four workflows pass: Notebook integrity, seismic-to-RMS validation, Northern Lights open-data validation, and data-reconciliation/Bayesian-twin validation.
• The repository-wide CO₂ low-temperature validator failed twice while executing its unchanged notebook against current NeqSim master.
• Both attempts fail the same pre-existing cell-46 assertion: EOS-CG detects nominal two-phase state at 25 C: False; the other eleven scientific assertions shown in that cell pass.
• This draft changes only comparesimulations2.ipynb and its two ledgers. No CO₂ notebook, workflow, or core thermodynamic source is modified.
• Status: EXACT-HEAD CI BLOCKED BY REPRODUCED OUT-OF-DIFF CO2 PHASE ASSERTION.

The draft remains open, mergeable, unmerged, and review-required.

Dependency ownership update — 2026-09-09: The repeated out-of-diff CO₂ phase assertion is already tracked by NeqSim-Colab #151. New evidence pins the reproduction to NeqSim source 1d4fcc111b7e80dee49cd0941d8317029b943296 and two attempts of workflow run 34404033648. The PFD/P&ID draft remains on exact head 308fd1e; no unrelated thermodynamics work was added.

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Whole-sheet review correction — 2026-09-10

• New review issue: equinor/neqsim#3619, based on exact notebook head 308fd1e690eac4d188275c2e862b9d3d6ee6f1fd and accepted renderer source df2de508ffff3dbc881bdb6e796fe4bb27627498.
• The review identifies concrete defects outside the current zero-warning coverage: false serial topology in the teaching BFD, clipped/hidden overview connectors, endpoint-envelope traversal, border violations, duplicate polyline emission, generic symbols and typography, unbound P&ID overlay placement, incorrect displayed sheet order, and incomplete visible-element exchange coverage.
• Determinism, byte-identical regeneration, and zero current renderer warnings remain valid evidence but no longer count as whole-sheet visual acceptance.
• NeqSim-Colab draft #156 remains exact-head, open, draft and unmerged; no code, rebase, ready transition or merge action occurred.
• #3619 is sequenced as the next coherent shared-#1332/#2899 implementation scope after the active notebook draft is resolved. It is not a second active campaign PR.
• Portfolio occupancy remains 8/10.

Status: FRESH PFD/P&ID EVIDENCE PUBLISHED IN DRAFT — WHOLE-SHEET ACCEPTANCE CORRECTED TO BLOCKED BY #3619; EXTERNAL CO₂ CI AND GOVERNED-ENGINEERING GATES OPEN.

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Active #3619 core prerequisite — 2026-09-10

• The explicit #3619 fix request opened core draft #3642; this supersedes the earlier sequencing statement that no implementation PR had started.
• Exact core head is ace1693445597db57667b6cf4c5526bacee3728a; the concept is frozen to BFD topology, sheet ordering, port/routing integrity and completed-scene diagnostics.
• The test-only hosted review repair routes six direct SVG numeric parses through the existing guarded helper. All six duplicated review threads are answered and resolved; production rendering and prior visual evidence are unchanged.
• Nine of ten exact-head workflows pass. Java 21 Ubuntu/Windows, all four slow shards, Javadocs, Java 8 Ubuntu, CodeQL, both notebook workflows, documentation, formatting, pre-commit, performance and PaperLab are green. Only Java 8 Windows remains active, with no failure. Whole-sheet acceptance remains blocked: current completed-scene diagnostics report 14 PFD and 413 P&ID warnings, with symbol, typography, physical P&ID attachment, printed stream identity and exchange round-trip gates still open.
• NeqSim-Colab draft #156 remains frozen at 308fd1e690eac4d188275c2e862b9d3d6ee6f1fd, open, draft, unrebased and unmodified. GitHub currently reports it non-mergeable; no branch disturbance was performed. It is the downstream notebook-publication draft and must be regenerated only after the core prerequisite is accepted and available.
• This recorded two-repository dependency does not replace or abandon either draft. No third campaign PR will be opened.
• Portfolio occupancy is 9/10.

Status: CORE #3619 EXACT-HEAD CI PENDING — NOTEBOOK PUBLICATION AND WHOLE-SHEET VISUAL ACCEPTANCE BLOCKED.

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Merged #3619 core prerequisite — 2026-09-10

• Core PR #3642 merged externally on September 10, 2026 as 653db71353dc3a5a0fad92b945978fd0bd94e74a, preserving source head ace1693445597db57667b6cf4c5526bacee3728a.
• All ten exact-head workflows passed, including Java 8/21 on Ubuntu and Windows, all four slow shards, Javadocs, both notebook workflows, CodeQL, documentation, formatting, pre-commit, performance and PaperLab. All six review threads remain resolved.
• Delivered core prerequisite: canonical BFD partition/topology, controlled sheet order, duplicate-continuation suppression, flow-aware port routing and completed-scene diagnostics.
• This is not whole-sheet acceptance: the merged reference still records 14 PFD and 413 P&ID completed-scene warnings. Reviewed symbols/typography, physical P&ID attachments, printed stream identities/tables, exchange projection/coverage and independent DEXPI/Proteus round trips remain open.
• Downstream NeqSim-Colab draft #156 remains exact-head at 308fd1e690eac4d188275c2e862b9d3d6ee6f1fd, open, draft, unrebased and unmodified. GitHub reports it non-mergeable; no branch disturbance occurred. Its next permitted action is same-branch clean regeneration and whole-sheet reinspection against the merged core prerequisite.
• 24-VB-01 remains absent. No conformance, certification, safety, construction or engineering-approval claim is made.
• Portfolio occupancy is 8/10.

Status: CORE PREREQUISITE MERGED AND EXACT-HEAD CI COMPLETE — DOWNSTREAM NOTEBOOK REGENERATION AND WHOLE-SHEET ACCEPTANCE BLOCKED.

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Exact merged-core notebook regeneration — 2026-09-10

• Downstream NeqSim-Colab draft #156 advanced on its existing branch to exact head b05f0b5, with 308fd1e690eac4d188275c2e862b9d3d6ee6f1fd preserved as its parent. The draft remains open, unmerged and not ready for review.
• The notebook now builds/runs merged core source 653db71353dc3a5a0fad92b945978fd0bd94e74a; retained provenance records JAR SHA-256 8b2eeb94e972e0c30467ad9c4f99f299b5fe9eec57b55f0e4ff4dd5896ec6704.
• Clean retained execution completed 34/34 code cells with sequential counts, no exceptions, no error outputs and no stored stderr. Notebook integrity reports zero errors/warnings; MathJax-compatible HTML conversion succeeds. Notebook SHA-256 is 04d572cf4671c52a3c18f1dfad27f3d1212273c5297f5854b7e690a7970b4561.
• Both profiles regenerated from the same canonical solved process fingerprint 47a2e6d7a3331f1ea2717b018e28977d943450bbe8130409d2401d223358ccc6: four A1 SVG sheets plus a four-page A1 PDF for PFD, and four distinct A1 SVG sheets plus a four-page A1 PDF for the P&ID proposal. All 29 current delivery files match an independent reconstruction byte-for-byte.
• Every sheet was inspected at whole-sheet and 200 dpi detail scales. The completed-scene gate now reports zero errors but 14 PFD warnings (9 text/route, 5 text/text) and 413 P&ID warnings (307 text/route, 77 proposal/route, 16 text/text, 11 text/symbol and 2 signal/object). The inspection confirms the flagged off-page-label, route, instrument, valve and attachment crowding. This exact evidence supersedes earlier zero-warning/visual-acceptance wording.
• Sheet 1 is explicitly a controlled sheet index, not process connectivity. The PFD/P&ID sheet order is process index, separation/oil export, recompression/dew point, then fuel split/gas export.
• DEXPI 2.0 Process, native DEXPI 2.0 Plant/P&ID and Proteus 4.1 compatibility companions remain separately labelled. Named-CAE round-trip qualification remains open.
• 24-VB-01 remains absent from the runnable model and generated deliveries; no equipment was invented. Dew-point recycle objects remain disclosed numerical utilities.
• Accountable project metadata, governed visual baselines, reviewed symbols/typography, physical P&ID attachment disposition, engineering-register review, licensed-text review and discipline approval remain open.
• Portfolio occupancy is 8/10.

Status: EXACT-HEAD NOTEBOOK REGENERATION PUBLISHED IN DRAFT — CI PENDING; WHOLE-SHEET VISUAL ACCEPTANCE BLOCKED BY RETAINED COMPLETED-SCENE DEFECTS.

No merge, rebase, ready transition, conformance claim, certification, safety credit, construction fitness or engineering approval was performed or asserted.

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Repository-ledger exact-head synchronization — 2026-09-10

• NeqSim-Colab draft #156 is exact-head at b05f0b5, with the existing three-file scope preserved.
• Its maintained ledgers now match the retained evidence: merged core 653db71353dc3a5a0fad92b945978fd0bd94e74a, 34/34 clean cells, 29/29 byte-identical delivery files, zero renderer errors, and 14 PFD / 413 P&ID warnings.
• Ledger JSON, notebook-ledger validation, six unit tests and whitespace validation pass. The draft remains open, unmerged and blocked from ready/merge by whole-sheet visual defects and the governed review gates.

Current exact-head CI state — 2026-09-10

GitHub reports no workflow runs yet for NeqSim-Colab exact head b05f0b5ac8335853116a515035f3cdfe56284553; hosted exact-head CI is therefore pending and no new hosted check is claimed as passed. The draft has no review threads, remains open/draft/unmerged, and is reported non-mergeable. No rebase or branch disturbance was performed.

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Runnable-model teaching overview correction — 2026-09-11

• Existing NeqSim-Colab draft #156 advanced without rebase or replacement to exact head 2bbb04c; its three-file scope is unchanged.
• The executed teaching overview no longer serializes gas export into oil export. It now presents distinct oil-export, fuel-gas and sales-gas branches plus two recycle paths, with eight aggregate connections asserted against and mapped to the fresh runnable-model DOT graph.
• Clean exact-core execution passed 34/34 code cells and 59 assertions with zero exceptions, error outputs or stderr. All 29 diagram delivery files remain byte-identical under independent reconstruction; notebook SHA-256 is 15e1429f379f7c2b9ea29525a19292d6a0cc9fb38bf40b084dddbce7d51f2b21.
• The fresh A1 PFD/P&ID PDFs were re-rendered at whole-sheet and 200 dpi detail scales. Completed-scene diagnostics remain 14 PFD and 413 P&ID warnings, zero errors; acceptance is still blocked.
• Scientific gates pass. Repeated exact-runtime full runs produced different feasible random-forest surrogate candidates despite fixed seeds, so 29-file diagram byte stability is qualified separately from surrogate-candidate repeatability. The retained candidate is 9430.9342 kW at 10.5094 psia; held-out R² is 0.796.
• No hosted workflows or commit statuses have appeared for the exact head; CI remains pending. No review threads exist. The PR remains open, draft, unmerged, not ready, and reported non-mergeable.
• 24-VB-01 remains absent; no equipment was invented. Portfolio occupancy remains 8/10.

Status: EXECUTED TEACHING OVERVIEW TOPOLOGY CORRECTED — EXACT-HEAD CI PENDING; WHOLE-SHEET VISUAL ACCEPTANCE BLOCKED.

Base-continuity note — 2026-09-11

After exact-head publication, NeqSim-Colab master advanced to f4e5a0156c413557d3a77be8ed716643856fcf3f. GitHub compares draft #156 at 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and three behind, and reports it non-mergeable. The branch remains unchanged under the exact-head/no-rebase rule; no rebase, merge, closure, replacement or ready transition was attempted.

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Base-continuity update — current master 67e4453

NeqSim-Colab master advanced from f4e5a0156c413557d3a77be8ed716643856fcf3f to 67e4453ed4ac25659c13db207119ff770d6218d8 through four commits. The new base delta adds the CO₂-hydrate/brine teaching notebook and catalog evidence and also changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and seven behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 17d6b3f

NeqSim-Colab master advanced from 67e4453ed4ac25659c13db207119ff770d6218d8 to 17d6b3f49c00cd0db07c528aa24a44e9fd2423f1 through two commits. The new base delta adds the Open DARTS waterflood teaching workflow and catalog entries and again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and nine behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 55a82aa

NeqSim-Colab master advanced from 17d6b3f49c00cd0db07c528aa24a44e9fd2423f1 to 55a82aa1dbe827f9b9fce597e65a3f5b5194f6c3 through two commits. The new base delta adds the hot-oil commissioning flow-assurance/ML teaching notebook and its README/catalog evidence and again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and eleven behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master ef3b9df

NeqSim-Colab master advanced from 55a82aa1dbe827f9b9fce597e65a3f5b5194f6c3 to ef3b9df814988af1a92e5dc082e30c390d027e26 through two commits. The new base delta merges the mechanical-design-to-3D equipment workflow, with separator/compressor model generation, qualified STL/GLB/JSON exchange, and README/catalog evidence; it again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and thirteen behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 0eb8f6d

NeqSim-Colab master advanced from ef3b9df814988af1a92e5dc082e30c390d027e26 to 0eb8f6d7ea1b679e6b4dd1983f5cd9d518bf1216 through two commits. The new base delta merges the executed AI Asset Team tie-back and debottlenecking workflow with README/catalog evidence and again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and fifteen behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master a70d31b

NeqSim-Colab master advanced from 0eb8f6d7ea1b679e6b4dd1983f5cd9d518bf1216 to a70d31b988342283bcae0ebd10aee986e5b29316 through eight commits. The new base delta merges the executed integrated Norne reservoir-to-facilities workflow using OPM, NeqSim and adaptive ML, together with its reproducible generator, dedicated validation workflow, and README/catalog evidence; it again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and twenty-three behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 103f0f3

NeqSim-Colab master advanced from a70d31b988342283bcae0ebd10aee986e5b29316 to 103f0f332b3cc0bcdb986ea78d01da6deac0e568 through six commits. The new base delta adds the executed centrifugal-compressor sizing/production-optimization and gas-distillation temperature-control notebooks, updates the CO₂ low-temperature notebook and its validation workflow, and adds the associated README/catalog and maintenance evidence; it again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and twenty-nine behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master eebab9f

NeqSim-Colab master advanced from 103f0f332b3cc0bcdb986ea78d01da6deac0e568 to eebab9f8992d58cfc084fda05de0731c7b9e052b through two commits. The new base delta corrects active_notebook_count in notebooks/notebook_maintenance_ledger.json, directly overlapping one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and thirty-one behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 9ce9374

NeqSim-Colab master advanced from eebab9f8992d58cfc084fda05de0731c7b9e052b to 9ce9374fb2f81af34f14df8c3e4e58cba34ed154 through two commits. The new base delta adds the wellstream steady/dynamic multiphase teaching notebook with hydrate and wax screening, together with README/catalog and maintenance evidence; it again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and thirty-three behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 885dfa2

NeqSim-Colab master advanced from 9ce9374fb2f81af34f14df8c3e4e58cba34ed154 to 885dfa25fbbf6ed44fcabedd44e93eff7978802f through two commits. The new base delta adds the NeqSim and Equinor TimeSeriesAnalysis large-process analytics book, together with README/catalog and maintenance evidence; it again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and thirty-five behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 7eb0bac

NeqSim-Colab master advanced from 885dfa25fbbf6ed44fcabedd44e93eff7978802f to 7eb0bac3a1eab0d486ec7c9e24065ac240dbb7cb through two commits. The new base delta expands the NeqSim/Equinor TimeSeriesAnalysis large-process notebook with PlantSimulator feedback and Python binding checks, updates its README/catalog and maintenance evidence, and again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and thirty-seven behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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Base-continuity update — current master 778ee7e

NeqSim-Colab master advanced from 7eb0bac3a1eab0d486ec7c9e24065ac240dbb7cb to 778ee7eef6ff8709373895fdb355f815ed533262 through three commits. The new base delta adds the fouling thermal-hydraulic preheater rating notebook with catalog and maintenance evidence and again changes notebooks/notebook_maintenance_ledger.json, one of this draft's three files. GitHub now compares draft #156 at exact head 2bbb04c289a2e8636aaaa935edf09f88513e9a48 as diverged, seven commits ahead and forty behind, and still reports it non-mergeable.

No exact-head workflow runs, commit statuses, or review threads have appeared. Per the exact-head/no-rebase rule, no source, branch, merge, closure, replacement, or ready-state action was taken. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

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External closure and base-continuity update — current master 744b98b

NeqSim-Colab draft #156 remains externally closed without merge since 2026-09-15 at 15:42:40 UTC. Its exact head remains 2bbb04c289a2e8636aaaa935edf09f88513e9a48, its three-file scope is unchanged, and it remains marked draft. No source or branch mutation accompanied the closure.

NeqSim-Colab master advanced from ed4f1ec32cebc1482fa6b0260d0aa1390eef8cdb to 744b98b9d4a1cb38f4e4e4dba7e1d1d3ffa24f58 through six commits. The delta adds an executed CO₂-injection well-interface paper companion notebook with README/catalog and maintenance evidence. It again changes notebooks/notebook_maintenance_ledger.json, one of #156's three files. GitHub now compares closed draft #156 as diverged, seven commits ahead and ninety-one behind.

No exact-head workflow runs, commit statuses, or review threads have appeared. The campaign did not reopen, replace, rebase, merge, modify, or mark the PR ready, and did not create a successor shared-lane PR. Publication remains paused pending an explicit safe transition from the external closure. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. The last positively identified portfolio occupancy remains 8/10 pending authoritative reassessment.

External closure and base-continuity update — current master 5062aba

As of September 27, 2026, NeqSim-Colab PR #156 remains closed without merge since 2026-09-15 at 15:42:40 UTC. Its exact head remains 2bbb04c289a2e8636aaaa935edf09f88513e9a48, its three-file scope is unchanged, and it remains marked draft. No source or branch mutation accompanied the closure.

NeqSim-Colab master advanced from 744b98b9d4a1cb38f4e4e4dba7e1d1d3ffa24f58 to 5062aba4962273f58ae6c80cb9997361c611b839 through five commits. The delta adds the executed hydrate-mitigation chemical-choice notebook for NeqSim #4016, its catalog entry, per-notebook validation record, and maintenance evidence. It again changes notebooks/notebook_maintenance_ledger.json, one of #156's three files. GitHub now compares closed draft #156 as diverged, seven commits ahead and ninety-six behind.

No exact-head workflow runs, commit statuses, or review threads have appeared. The campaign did not reopen, replace, rebase, merge, modify, or mark the PR ready, and did not create a successor shared-lane PR. Publication remains paused pending an explicit safe transition from the external closure. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. The last positively identified portfolio occupancy remains 8/10 pending authoritative reassessment.

External closure and base-continuity update — current master dcaaab9

As of September 27, 2026, NeqSim-Colab PR #156 remains closed without merge since 2026-09-15 at 15:42:40 UTC. Its exact head remains 2bbb04c289a2e8636aaaa935edf09f88513e9a48, its three-file scope is unchanged, and it remains marked draft. No source or branch mutation accompanied the closure.

NeqSim-Colab master advanced from 5062aba4962273f58ae6c80cb9997361c611b839 to dcaaab964def43a54747228ca118b1208a0ece88 through nine commits. The delta adds an executed ASE/PySCF/NeqSim lithium-perovskite-hydride study and an executed continuous-agentic compressor live-task notebook, together with README/catalog and validation/maintenance evidence. It again changes notebooks/notebook_maintenance_ledger.json, one of #156's three files. GitHub now compares closed draft #156 as diverged, seven commits ahead and one hundred five behind.

No exact-head workflow runs, commit statuses, or review threads have appeared. The campaign did not reopen, replace, rebase, merge, modify, or mark the PR ready, and did not create a successor shared-lane PR. Publication remains paused pending an explicit safe transition from the external closure. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. The last positively identified portfolio occupancy remains 8/10 pending authoritative reassessment.

Continuity refresh — 2026-09-29 (master 87fae96)

• master advanced two commits from dcaaab9 to 87fae96, merging PR #184 to validate official TimeSeriesAnalysis Python-wrapper parity.
• The delta modifies README.md, notebooks/advanced_analytics/neqsim_timeseriesanalysis_large_process.ipynb, the shared examples catalog, and its maintenance record. The catalog/maintenance overlap is recorded; no PFD/P&ID artifact or frozen-head file changed in this delta.
• PR #156 is now 7 commits ahead and 107 behind master. Its exact head remains 2bbb04c289a2e8636aaaa935edf09f88513e9a48, externally closed, draft, unmerged, non-mergeable, and unre-based.
• No exact-head workflow runs, commit statuses, or review threads appeared. The required 2026-09-07 milestone sections remain present in both #1332 and #2899.
• The campaign did not reopen, replace, rebase, merge, or mark the PR ready, and created no successor shared-lane PR. Publication remains paused pending an explicit safe transition from the external closure. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. The last positively identified portfolio occupancy remains 8/10 pending authoritative reassessment.

Continuity refresh — 2026-10-04 (master d7d5f9d)

• master advanced two commits from 87fae96 to d7d5f9d, merging PR #186 for the executed NeqSim PVT / OPM Flow hydrocarbon phase-evolution demonstration linked to research-scan: 1 paper opportunities found (top score 30) equinor/neqsim#4198.
• The delta adds the executed reservoir notebook and per-notebook validation record and modifies README.md, the shared examples catalog, and notebooks/notebook_maintenance_ledger.json. The shared-ledger overlap is recorded; no PFD/P&ID artifact or frozen-head file changed in this delta.
• PR #156 is now 7 commits ahead and 109 behind master. Its exact head remains 2bbb04c289a2e8636aaaa935edf09f88513e9a48, externally closed, draft, unmerged, non-mergeable, and unre-based.
• No exact-head workflow runs, commit statuses, or review threads appeared. The required 2026-09-07 milestone sections remain present in both #1332 and #2899.
• The campaign did not reopen, replace, rebase, merge, modify, or mark the PR ready, and created no successor shared-lane PR. Publication remains paused pending an explicit safe transition from the external closure. Whole-sheet acceptance remains blocked at 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. The last positively identified portfolio occupancy remains 8/10 pending authoritative reassessment.

Base-continuity refresh — 2026-10-05

• master advanced two commits from d7d5f9d to bc8c96b, merging PR #188 to fix the CO₂-hydrate tutorial for 10 wt% KCl and finite CO₂ inventory.
• The delta modifies the notebook catalog, co2_hydrate_brines_and_drilling_fluids.ipynb, and its maintenance ledger; it does not modify the frozen PFD/P&ID artifacts.
• Draft [AI-Assisted] Add fresh comparesimulations2 PFD and P&ID workflow #156 remains externally closed, draft, unmerged, non-mergeable, and unre-based on exact head 2bbb04c; it is 7 commits ahead and 111 behind master.
• Exact-head workflows, commit statuses, and review threads remain absent. The required #1332/#2899 visual-acceptance milestone text remains intact.
• Acceptance remains blocked by 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

Base-continuity refresh — 2026-10-05 (README title)

• master advanced two commits from bc8c96b to d6f54c6, updating the README title to remove “in Colab”.
• The delta changes only README.md; it does not modify the frozen PFD/P&ID artifacts or shared notebook ledger.
• Draft [AI-Assisted] Add fresh comparesimulations2 PFD and P&ID workflow #156 remains externally closed, draft, unmerged, non-mergeable, and unre-based on exact head 2bbb04c; it is 7 commits ahead and 113 behind master.
• Exact-head workflows, commit statuses, and review threads remain absent. The required #1332/#2899 visual-acceptance milestone text remains intact.
• Acceptance remains blocked by 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.

Base-continuity refresh — 2026-10-06

• master advanced four commits from d6f54c6 to 4c2139b, merging PR #189 with Dholabhai hydrate comparisons and salt-specific accuracy discussion.
• The delta modifies the notebook catalog, co2_hydrate_brines_and_drilling_fluids.ipynb, and its maintenance ledger; it does not modify the frozen PFD/P&ID artifacts.
• Draft [AI-Assisted] Add fresh comparesimulations2 PFD and P&ID workflow #156 remains externally closed, draft, unmerged, non-mergeable, and unre-based on exact head 2bbb04c; it is 7 commits ahead and 117 behind master.
• Exact-head workflows, commit statuses, and review threads remain absent. The required #1332/#2899 visual-acceptance milestone text remains intact.
• Acceptance remains blocked by 14 PFD and 413 P&ID warnings; 24-VB-01 remains absent. Portfolio occupancy remains 8/10.