Borrowing it
Nothing to install: this file belongs to equinor/neqsim. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/equinor/neqsim/master/.github/skills/neqsim-rotating-equipment-design/SKILL.mdgit 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-rotating-equipment-design)<a href="https://agentmods.dev/skills/equinor/neqsim/neqsim-rotating-equipment-design"><img src="https://agentmods.dev/badge/skills/equinor/neqsim/neqsim-rotating-equipment-design/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-rotating-equipment-design"><img src="https://agentmods.dev/badge/skills/equinor/neqsim/neqsim-rotating-equipment-design.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 | $0.00100 | $0.03955 |
| Opus 5.5 | $0.00040 | $0.01582 |
| Sonnet 5.5 | $0.00020 | $0.00791 |
| Haiku 4.5 | $0.00010 | $0.00396 |
Grade A, and why
neqsim-rotating-equipment-design 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 7d 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 — 147 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Rotating Equipment Design
When to use this
Use this skill when an agent needs to create, correct, apply or interpret compressor, turboexpander or pump performance maps, operating envelopes, operating profiles, or first-pass mechanical checks. Load neqsim-compressor-antisurge-recycle for recycle-control topology and anti-surge dynamics. This skill covers machine performance/design API and data validity, not a vendor-certified selection.
Class map
| Class | Package | What it does | Verified API |
|---|---|---|---|
CompressorChart, CompressorChartInterface |
neqsim.process.equipment.compressor |
Stores speed curves and retrieves head/efficiency at flow and speed | addCurve(double,double[],double[],double[]), getPolytropicHead(double,double), getPolytropicEfficiency(double,double) |
CompressorChartReader, CompressorChartJsonReader |
neqsim.process.equipment.compressor |
Loads curve data and attaches chart curves to a compressor | setCurvesToCompressor(Compressor) |
CompressorChartCalibrator, SafeSplineSurgeCurve, SafeSplineStoneWallCurve |
neqsim.process.equipment.compressor |
Fits measured surge points and provides safe surge/stonewall curve implementations | fitSurgeCurve(double[],double[]), molarMassHeadCorrectionFactor(double,double) |
CompressorCurveCorrections, CompressorCurveTemplate, CompressorChartMWInterpolation |
neqsim.process.equipment.compressor |
Applies declared curve corrections/templates or interpolates maps by gas molecular weight | calculateReynoldsEfficiencyCorrection(double,double), addMapAtMW(double,double[],double[][],double[][],double[][]) |
CompressorChartAlternativeMapLookup, CompressorChartAlternativeMapLookupExtrapolate, CompressorChartKhader2015 |
neqsim.process.equipment.compressor |
Alternative map lookup, explicit extrapolation variant and Khader chart form | getPolytropicHead(...), getPolytropicEfficiency(...), setCurves(...) |
Compressor, CompressorTrain |
neqsim.process.equipment.compressor |
Core machine and a separator-compressor-aftercooler composite | setCompressorChart(...), getChartFlowStatus(), isChartExtrapolated(), getValidatedDistanceToSurge(), getCompressor() |
OperatingEnvelope, CompressorThermalModel, StartupProfile, ShutdownProfile |
neqsim.process.equipment.compressor |
Surge/stonewall boundaries, compressor heat network and speed-versus-time profiles | getSurgeMargin(double,double,double), getStonewallMargin(double,double,double), getNodes(), getTargetSpeedAtTime(double,double) |
CompressorOperatingHistory, CompressorWashing, CompressorMechanicalLosses, RecycleFlowCoordinator, AdvancedAntiSurgeControlSystem |
neqsim.process.equipment.compressor |
History, degradation/wash, seal and bearing losses, recycle and advanced controller calculations | getCurrentFoulingFactor(), getTotalMechanicalLoss(), getLastRecycleFlow(), calculateValveCommand(double,double,double) |
TurboExpanderCompressor, MapTurboExpanderCompressor, Expander |
neqsim.process.equipment.expander |
Expander or coupled expander/compressor machine and power-balance state | getPowerExpander("kW"), getPowerCompressor("kW"), getPowerBalanceResidual(), getOperatingStatus() |
TurboExpanderMapIngestion, RadialExpanderGeometryMap, TurboExpanderOperatingEnvelope, ExpanderChartKhader |
neqsim.process.equipment.expander |
Map anchors, geometry-derived curves, operating grid and Khader chart lookup | addAnchorPoint(String,double,double,double), setReferenceFluid(SystemInterface), setGrid(double[],double[]), getFeasibility() |
Pump, PumpChart, SuckerRodPump |
neqsim.process.equipment.pump |
Centrifugal pump thermodynamics/map; sucker-rod pump specialty model | setOutletPressure(double), getPower(String), getPumpChart(), chart getHead(double,double) and getNPSHRequired(double,double) |
PumpHydraulicsNpshCalculator, PumpApi610DesignCalculator |
neqsim.process.mechanicaldesign.pump |
Hydraulic power/NPSH calculation and evidence-based API 610 screening | setDutyPoint(double,double,double,double), setSuctionConditions(double,double,double,double,double,double), calcHydraulics(), getNpshAvailable(), API 610 calculate(), getChecks() |
AxialThrustScreening, CompressorCasingDesignCalculator, RotorUnbalanceAssessment, CompressorDesignFeasibilityReport |
neqsim.process.mechanicaldesign.compressor |
Compressor thrust, casing, unbalance and feasibility screens | getPredictedThrust(), getRequiredWallThicknessMm(), getUnbalanceRatio(), getVerdict() |
TurboExpanderSealGasEnvelope |
neqsim.process.mechanicaldesign.expander |
Coupled expander/compressor seal-gas and thrust envelope | getNetAxialThrust(), getThrustUtilisation(), getRequiredHeaterDuty() |
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.
- 7d ago Changed · +4 lines 3d0092923b03
- 10d ago Changed · +9 lines bed4478e87c9
- 13d ago First seen · 134 lines · 100 tokens per session scan A 185eb4e25fd8
neqsim-rotating-equipment-design is a skill published in the GitHub repository equinor/neqsim (156 stars, last pushed today), licensed Apache-2.0. It adds 100 tokens to every session and 3,955 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.
Other skills, from other repositories
local-ai-agents
Build local-first AI agents that run entirely on a developer workstation with Microsoft Foundry Local and Qwen function-calling models. Covers Small Language Models (SLMs), the OpenAI-compatible local endpoint, sandboxed local tools, local RAG with Chroma, local MCP servers, hybrid cloud/local routing, and the…
systematic-debugging
Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.
next-cache-components-adoption
Turn on Cache Components in a Next.js app and resolve the blocking routes it surfaces. Use when the user wants to enable, adopt, or migrate to Cache Components, flip the cacheComponents flag, work through a flood of blocking-prerender / instant validation errors, run the cache-components-instant-false codemod, or…
chat-pet-sprite-creation
Use when creating or changing VS Code chat pet sprite art, sprite sheets, state animations, eye treatments, Stable/Insiders variants, or pet transitions under src/vs/workbench/contrib/chat/browser/widget/media/chatPet.
cpu-profile-analysis
Analyze V8/Chrome CPU profiles (.cpuprofile) and DevTools trace files (Trace-.json). Use when: profiling performance, investigating slow functions, comparing code paths, finding bottlenecks, analyzing timeToRequest, understanding call trees from sampling profiler data, analyzing layout/paint/rendering, investigating…
insight-error-page
Write or audit an insight-kind error page for the Next.js dev overlay. Use when creating a new errors/ .mdx page, auditing an existing one, or checking that a page matches the framework fix cards. Covers page structure, title alignment, FixCard cards with Copy prompt button, code snippets, terminology verification…