neqsim-compressor-antisurge-recycle

neqsim-compressor-antisurge-recycle is a skill for Claude Code, Codex from equinor/neqsim-community-skills. It costs 94 tokens per session (9,385 once invoked), scanned A, original, Apache-2.0.

A setup guide for protecting a centrifugal compressor with an anti-surge recycle loop. The loop sends some discharge gas back to the inlet when flow approaches surge, and the guide covers steady-state and dynamic control in NeqSim.

In plain words
What is it for?
Use it to create compressor charts, estimate recycle flow, configure hot and cold recycle valves, add a cooler and mixer, and set up proportional-integral control and speed runback.
Why use it?
It provides a way to keep the compressor away from unstable low-flow operation when a vendor compressor chart is unavailable or when a model needs control logic.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: positional $N argument.

Good fit Use it to create compressor charts, estimate recycle flow, configure hot and cold recycle valves, add a cooler and mixer, and set up proportional-integral control and speed runback.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/equinor/neqsim-community-skills/neqsim-compressor-antisurge-recycle
Install

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.

Any agent
npx skills add equinor/neqsim-community-skills --skill neqsim-compressor-antisurge-recycle
Clone the repo
git clone --depth 1 https://github.com/equinor/neqsim-community-skills

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for neqsim-compressor-antisurge-recycle

README.md
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Your own site
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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.

agentmods 80×15 button for neqsim-compressor-antisurge-recycle

Your own site · 80×15
<a href="https://agentmods.dev/skills/equinor/neqsim-community-skills/neqsim-compressor-antisurge-recycle"><img src="https://agentmods.dev/badge/skills/equinor/neqsim-community-skills/neqsim-compressor-antisurge-recycle.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 94 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 9,385 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00094 $0.09385
Opus 5.5 $0.00038 $0.03754
Sonnet 5.5 $0.00019 $0.01877
Haiku 4.5 $0.00009 $0.00938

Measured 10d ago against content hash 1e719a17d658, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

neqsim-compressor-antisurge-recycle 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 10d ago.

The scan reads SKILL.md. This mod also ships 4 executable files (examples/basic_compressor_antisurge_recycle.py, src/compressor_antisurge_recycle/__init__.py, src/compressor_antisurge_recycle/model.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/process/neqsim-compressor-antisurge-recycle/SKILL.md · 758 lines

How it starts

The opening of the file, as written. The whole thing — 758 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Compressor Anti-Surge Recycle Setup

This skill explains how to protect a centrifugal compressor against surge in a NeqSim ProcessSystem by adding a recycle (spill-back) loop. It covers the preferred steady-state helper (AntiSurgeRecycleCalculator), the dynamic reverse-acting PI controller (AntiSurgeController), and the application-level supervisor (CompressorAntiSurgeApplication) that can bind directly to real NeqSim topology objects such as a compressor, hot recycle valve, cold recycle valve, cooler, mixer, recycle blocks, and ProcessSystem. It also explains how to auto-generate a compressor chart with surge and stonewall curves when no vendor chart is available, because every anti-surge option needs a surge limit to act against.

The pure-Python helper (AntiSurgeRecycleModel) is an educational planning aid that mirrors NeqSim's proportional anti-surge step so an agent can pre-estimate the recycle flow and decide whether a chart must be generated first. Real control design must use the validated NeqSim equipment classes below and a qualified rotating-equipment review (API 617 / API 692).

When to Use

Use this skill when:

  • A NeqSim compressor operating point can fall to the left of its surge line at low throughput (turndown, start-up, trips) and needs recycle protection.
  • You must build the anti-surge recycle topology (surge curve, recycle stream, discharge splitter or recycle branch, anti-surge valve, Recycle, and optional cooler/mixer).
  • You need an executable dynamic application model where CompressorAntiSurgeApplication writes hot/cold recycle valve openings and optional compressor speed runback to real NeqSim units.
  • No vendor compressor chart is provided and a chart with surge and stonewall curves must be generated from the compressor's design point.
  • You want a screening estimate of the recycle flow required to keep the compressor off surge before running the full simulation.

Do not use this skill as a substitute for vendor performance maps, anti-surge controller tuning, dynamic surge/transient analysis, or rotating-equipment design review.

Read the full file on GitHub · 758 lines

Files

What ships with it

6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

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.

  1. 10d ago Changed · +6 lines 1e719a17d658
  2. 11d ago Changed · +6 lines 6835071731f2
  3. 19d ago Changed · +96 lines · -9 tokens per session b9e34304804b
  4. 1mo ago Changed · +19 lines 5f563d5b5a74
  5. 1mo ago First seen · 631 lines · 103 tokens per session scan A 0843e1286540

Subscribe to this mod's changes

neqsim-compressor-antisurge-recycle is a skill published in the GitHub repository equinor/neqsim-community-skills (4 stars, last pushed today), licensed Apache-2.0. It adds 94 tokens to every session and 9,385 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 2026-09-19.

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