[EvenSol]

Campaign

Continues equinor/neqsim#3305 after the merged current-source prerequisite equinor/neqsim#4501.

Capability contract

• Carry one public DOE SPR Big Hill Sweet assay through the source-pinned fired heater and rigorous atmospheric column.
• Feed the atmospheric bottoms into a connected three-point vacuum reboiler-temperature sensitivity at 698/700/702 K.
• Retain executed conservation, MESH residual, product-ordering, source-stream immutability, provenance, and rendered sensitivity evidence.
• Add the notebook to the README, executable catalog, and maintenance ledger.
• Change no Java API or numerical model.

Exact provenance

• Colab base: c4332e2023f594e83fabe93212602a7e996d0a71
• Draft head: 4364a2b970235d8b554569995fec89cbd1929587
• NeqSim source: 74a0529d19db577cb41034685905067a8ac9d0c6
• Source-built JAR SHA-256: da6d66a14de7410b596308358664df4b50f20091799e4d48aad0686561f44270
• Runtime: Python 3.12.14, NeqSim Python 3.26.0, JPype1 1.7.1, OpenJDK 17.0.20
• Public assay sources:
  • https://www.spr.doe.gov/reports/Assays/2024/BigHillSwAssay.xlsx
  • https://www.spr.doe.gov/reports/Assays/2021/BigHillSwPIANO.xlsx

Engineering evidence

• 7/7 code cells executed in order with retained outputs; 8 markdown cells.
• Feed: 5000.0 kg/h; atmospheric bottoms: 2034.516494 kg/h.
• Vacuum overhead mass fraction: 71.953165%, 72.234274%, 72.496050%.
• Maximum relative mass closure: 2.728e-13.
• Maximum relative component closure: 9.329e-13.
• Maximum column energy-balance error: 0.02480694.
• Maximum MESH residual norm: 0.01225151.
• Caller-owned source mass and composition deltas: exactly zero.
• Notebook SHA-256: 483d39d54751630d9e35253f1a26f38be770f188f97d36e981e739ac4926be3e.

Validation

• Clean, sequential in-process notebook execution passed.
• Source commit, runtime JAR digest, and loaded-class origin were verified before calculation.
• Strict notebook checker: 0 errors, 0 warnings.
• Checker unit tests: 6 passed.
• Full repository check: 368 notebooks, 0 errors; 47 pre-existing warnings.
• nbformat, Python AST/readability, output-error/stderr, and compact Colab-safe math checks passed.
• nbconvert HTML render retained equations, tables, validation receipt, and the two-panel plot.
• Original-resolution figure and both conservation equations passed visual inspection.

Scientific boundaries

This is a numerical screening workflow. The DOE sources establish assay identity, not the modeled operating conditions. The notebook makes no plant-yield benchmark, ASTM D86/D1160/D2887 qualification, hydraulics, coking, corrosion, controls, safe-operability, or design-approval claim.

Campaign state

This draft is the sole active #3305 increment. It raises the positively identified autonomous capability occupancy from 3/10 to 4/10 without disturbing any existing exact remote head.

Status: READY TO MERGE — EXACT-HEAD VALIDATED, DRAFT PRESERVED