Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add equinor/neqsim --skill neqsim-column-internals-and-rate-basedgit clone --depth 1 https://github.com/equinor/neqsimWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/equinor/neqsim/neqsim-column-internals-and-rate-based)<a href="https://agentmods.dev/skills/equinor/neqsim/neqsim-column-internals-and-rate-based"><img src="https://agentmods.dev/badge/skills/equinor/neqsim/neqsim-column-internals-and-rate-based/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/equinor/neqsim/neqsim-column-internals-and-rate-based"><img src="https://agentmods.dev/badge/skills/equinor/neqsim/neqsim-column-internals-and-rate-based.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00109 | $0.04679 |
| Opus 5.5 | $0.00044 | $0.01872 |
| Sonnet 5.5 | $0.00022 | $0.00936 |
| Haiku 4.5 | $0.00011 | $0.00468 |
Grade A, and why
neqsim-column-internals-and-rate-based scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 164 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Column Internals and Rate-Based Contactors
When to use this
Use this skill to select and inspect NeqSim's distillation/contacting model class, evaluate tray or packing hydraulics, or decide whether the task needs equilibrium-stage VLE or explicit rate-based mass transfer. This complements neqsim-distillation-design: that skill remains the detailed reference for ordinary DistillationColumn setup, specification combinations, solver troubleshooting, convergence gates, feed placement and Fenske/Underwood/Gilliland checks. Do not duplicate its full workflow; use this skill for model-class boundaries and internals/hydraulic APIs.
Class map
| Class | Package | What it does | Verified API surface |
|---|---|---|---|
DistillationColumn |
process.equipment.distillation |
Equilibrium-stage MESH tray column; also supports explicit side draws and liquid pumparound circuits. | DistillationColumn(String, int, boolean hasReboiler, boolean hasCondenser), addFeedStream(StreamInterface, int), setSideDrawFraction(int, SideDrawPhase, double), getSideDrawStream(int, SideDrawPhase), addSideDrawFlowSpecification(int, SideDrawPhase, double, String), addLiquidPumparound(String, int drawTray, int returnTray, double drawFraction, double temperatureDropK), getPumparounds(). |
ShortcutDistillationColumn |
process.equipment.distillation |
Fenske–Underwood–Gilliland design estimate for a key-component separation; not a rigorous tray solve. | ShortcutDistillationColumn(String, StreamInterface), setLightKey(String), setHeavyKey(String), setLightKeyRecoveryDistillate(double), setHeavyKeyRecoveryBottoms(double), setRefluxRatioMultiplier(double), run(), getMinimumNumberOfStages(), getMinimumRefluxRatio(), getActualNumberOfStages(), isSolved(). |
PackedColumn |
process.equipment.distillation |
Equilibrium-stage DistillationColumn with packing-derived hydraulic and stage-equivalence results after the VLE solve. |
Constructor with gas feed or (String, double, String, boolean, boolean); setPackedHeight, setPackingType, setStructuredPacking, setDesignFloodFraction, getHETP(), getTheoreticalStages(), getNumberOfTrays(), getPercentFlood(), getPackingPressureDrop(), isHydraulicsCalculated(). |
RateBasedPackedColumn |
process.equipment.distillation |
Counter-current segmented packing model with interphase component transfer and heat-transfer options; distinct from equilibrium trays. | RateBasedPackedColumn(String, StreamInterface, StreamInterface), setColumnDiameter, setPackedHeight, setNumberOfSegments, setPackingType, setTransferComponents(String...), setMaxIterations, setConvergenceTolerance, getComponentTransferTotals(), getSegmentResults(), solved(). |
DistillationColumnMatrixSolver, NaphtaliSandholmSolver |
process.equipment.distillation |
Specialized component-balance matrix warm-start and simultaneous MESH solver. | DistillationColumnMatrixSolver(DistillationColumn), setMaxIterations, setTolerance, setDampingFactor; NaphtaliSandholmSolver(DistillationColumn), getLastIterations(), getLastMassBalanceError(). |
ColumnSpecification |
process.equipment.distillation |
Typed target specification for column product/location quantities. | Constructors: (SpecificationType, ProductLocation, double), (SpecificationType, ProductLocation, double, String componentName), and (SpecificationType, ProductLocation, double, String componentName, String targetUnit); getters: getType(), getLocation(), getTargetValue(), getComponentName(). |
ScrubColumn |
process.equipment.distillation |
Specialized equilibrium column with heavy-key overhead and bottoms-temperature limits. | ScrubColumn(String, int, boolean, boolean), setHeavyKeyComponent, setMaxHeavyKeyInOverhead, setMinimumBottomsTemperature(double, String). |
SimpleTray, ReactiveTray, VLSolidTray |
process.equipment.distillation |
Stage mixer/flash implementation, reactive-flash-capable tray, and vapor-liquid-solid tray variant. | Constructors SimpleTray(String), ReactiveTray(String), VLSolidTray(String); SimpleTray.setUseReactiveFlash(boolean), setHeatInput(double), getGasOutStream(). |
ColumnInternalsDesigner |
process.equipment.distillation.internals |
Evaluates every tray or a packed bed, finds controlling hydraulics, and sizes/grades internals from a solved column. | ColumnInternalsDesigner(DistillationColumn), setInternalsType(String), setTraySpacing(double), setDesignFloodFraction(double), setPackingPreset(String), setPackedHeight(double), calculate(), getRequiredDiameter(), isDesignOk(), getMaxPercentFlood(), getTotalPressureDrop(). |
TrayHydraulicsCalculator |
process.equipment.distillation.internals |
Standalone tray flood, weeping, entrainment, downcomer, pressure-drop, efficiency and diameter checks. | setTrayType(String), setColumnDiameter(double), setTraySpacing(double), setVaporMassFlow(double), setLiquidMassFlow(double), setVaporDensity(double), setLiquidDensity(double), calculate(), getPercentFlood(), isWeepingOk(), isDowncommerBackupOk(), getTotalTrayPressureDrop(). |
PackingHydraulicsCalculator |
process.equipment.distillation.internals |
Standalone packing pressure-drop, capacity, wetting/mass-transfer, HETP and diameter checks. | setPackingPreset(String), setStructuredPackingPreset(String), setVaporMassFlow(double), setLiquidMassFlow(double), setVaporDensity(double), setLiquidDensity(double), setDesignFloodFraction(double), calculate(), sizeColumnDiameter(), getPercentFlood(), getPressureDropPerMeter(), getHETP(), getNumberOfTheoreticalStages(). |
PackingSpecification, PackingSpecificationLibrary |
process.equipment.distillation.internals |
Stores packing category/material/geometry; resolves registered presets and aliases. | PackingSpecificationLibrary.get(String), getOrDefault(String), register(...); specification getters include getSpecificSurfaceArea(), getVoidFraction(), getPackingFactor(), and getCriticalSurfaceTension(). |
PackingFoulingModel, GravityDrainageMargin |
process.equipment.distillation.internals |
Adjusts packing geometry for deposit/void loss and screens liquid drainage head against gas pressure drop. | PackingFoulingModel.fromVoidLossFraction(...), fromDepositThickness(...), getFouledVoidFraction(), getPressureDropRatio(); GravityDrainageMargin(double, double, double), canDrain(), getMarginPressure(), getMarginRatio(). |
DistillationColumnMechanicalDesign |
process.mechanicaldesign.distillation |
Mechanical-design envelope for column geometry, internals, flooding, duties, material and estimated weights/cost. | Constructor accepts ProcessEquipmentInterface; readDesignSpecifications(), calcDesign(), getColumnDiameter(), getColumnHeight(), getTotalPressureDrop(), setContactorInternalsType(String), getContactorCapacityResult(). |
ProductBoilingPointDistribution |
process.equipment.distillation |
Discrete normal-boiling-point diagnostic from a stream, not a test curve. | from(StreamInterface), getBoilingPointTemperaturesKelvin(), getCumulativeMoleFractions(), getMeanNormalBoilingPointKelvin(). |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 164 lines · 109 tokens per session scan A 3c091108984c
neqsim-column-internals-and-rate-based is a skill published in the GitHub repository equinor/neqsim (156 stars, last pushed today), licensed Apache-2.0. It adds 109 tokens to every session and 4,679 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-05.
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