neqsim-compressor-antisurge-recycle

neqsim-compressor-antisurge-recycle is a skill for Claude Code, Codex from equinor/neqsim-community-skills. It costs 103 tokens per session (7,404 once invoked), scanned A, original, Apache-2.0.

A setup guide for protecting a centrifugal compressor from surge, an unstable condition caused by too little flow. It covers recycle flow, compressor charts, controllers, and connections to NeqSim process equipment.

In plain words
What is it for?
Use it to create compressor charts, estimate recycle flow, configure hot or cold recycle valves, tune a PI controller, and model speed runback.
Why use it?
It helps prepare both steady-state and time-based compressor control models with a defined surge limit. It also addresses cases where no vendor compressor chart is available.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to create compressor charts, estimate recycle flow, configure hot or cold recycle valves, tune a PI controller, and model speed runback.

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Install with agentmods
npx agentmods add skills/equinor/neqsim-community-skills/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 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
[![agentmods](https://agentmods.dev/badge/skills/equinor/neqsim-community-skills/compressor-antisurge-recycle/github.svg)](https://agentmods.dev/skills/equinor/neqsim-community-skills/compressor-antisurge-recycle)
Your own site
<a href="https://agentmods.dev/skills/equinor/neqsim-community-skills/compressor-antisurge-recycle"><img src="https://agentmods.dev/badge/skills/equinor/neqsim-community-skills/compressor-antisurge-recycle/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.

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/equinor/neqsim-community-skills/compressor-antisurge-recycle"><img src="https://agentmods.dev/badge/skills/equinor/neqsim-community-skills/compressor-antisurge-recycle.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 103 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 7,404 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 $0.00103 $0.07404
Opus 5 $0.00051 $0.03702
Sonnet 5 $0.00021 $0.01481
Haiku 4.5 $0.00010 $0.00740

Measured 12d ago against content hash 0843e1286540, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, 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 12d 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/compressor-antisurge-recycle/SKILL.md · 631 lines

How it starts

The opening of the file, as written. The whole thing — 631 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 · 631 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. 12d 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 (2 stars, last pushed yesterday), licensed Apache-2.0. It adds 103 tokens to every session and 7,404 once invoked, about $0.0005 per session on Opus 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 2026-08-31.

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