neqsim-multiphase-flow-slug-screening

neqsim-multiphase-flow-slug-screening is a skill for Claude Code, Codex from equinor/neqsim-community-skills. It costs 69 tokens per session (1,478 once invoked), scanned A, original, Apache-2.0.

A coarse screening tool for intermittent slug flow in a gas-and-liquid pipeline and for the first-pass volume of a slug catcher. A slug catcher is equipment that receives and holds large liquid slugs arriving from a pipeline.

In plain words
What is it for?
Use it to estimate slug risk and an initial catcher volume from phase velocities, pipe diameter, slug length, liquid hold-up, and a surge factor.
Why use it?
It helps identify a possible surge problem and scope equipment before detailed multiphase-flow analysis, without requiring a full confidential pipeline model.

Skill for Claude CodeCodex

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

Good fit Use it to estimate slug risk and an initial catcher volume from phase velocities, pipe diameter, slug length, liquid hold-up, and a surge factor.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/equinor/neqsim-community-skills/neqsim-multiphase-flow-slug-screening
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-multiphase-flow-slug-screening
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-multiphase-flow-slug-screening

README.md
[![agentmods](https://agentmods.dev/badge/skills/equinor/neqsim-community-skills/neqsim-multiphase-flow-slug-screening/github.svg)](https://agentmods.dev/skills/equinor/neqsim-community-skills/neqsim-multiphase-flow-slug-screening)
Your own site
<a href="https://agentmods.dev/skills/equinor/neqsim-community-skills/neqsim-multiphase-flow-slug-screening"><img src="https://agentmods.dev/badge/skills/equinor/neqsim-community-skills/neqsim-multiphase-flow-slug-screening/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-multiphase-flow-slug-screening

Your own site · 80×15
<a href="https://agentmods.dev/skills/equinor/neqsim-community-skills/neqsim-multiphase-flow-slug-screening"><img src="https://agentmods.dev/badge/skills/equinor/neqsim-community-skills/neqsim-multiphase-flow-slug-screening.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 69 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,478 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 $0.00069 $0.01478
Opus 5.5 $0.00028 $0.00591
Sonnet 5.5 $0.00014 $0.00296
Haiku 4.5 $0.00007 $0.00148

Measured 1mo ago against content hash 519d8264b3f7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

neqsim-multiphase-flow-slug-screening 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 1mo ago.

The scan reads SKILL.md. This mod also ships 4 executable files (examples/basic_slug_screening.py, src/multiphase_flow_slug_screening/__init__.py, src/multiphase_flow_slug_screening/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/flow-assurance/neqsim-multiphase-flow-slug-screening/SKILL.md · 118 lines

How it starts

The opening of the file, as written. The whole thing — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Multiphase Flow Slug Screening

Use this skill for public, educational multiphase slug-flow screening. It gives a coarse flow-regime indicator from superficial gas and liquid velocities and a first-pass slug-catcher volume estimate from slug geometry, so an agent can flag slug risk before moving to validated multiphase flow analysis.

When to Use

  • When a user asks whether a multiphase line is likely to be in a slug regime.
  • When an agent needs a quick slug-catcher volume order-of-magnitude to scope a flow-assurance study.
  • When examples must run without confidential pipeline geometry, project flow-assurance reports, or company multiphase guidelines.

Inputs

  • superficial_gas_velocity: superficial gas velocity in m/s.
  • superficial_liquid_velocity: superficial liquid velocity in m/s.
  • pipe_internal_diameter: pipe inside diameter in m.
  • slug_length_to_diameter: slug length expressed as a multiple of the diameter, default 30.0.
  • liquid_holdup_in_slug: liquid holdup in the slug body, dimensionless in (0, 1], default 0.8.
  • surge_factor: surge/safety factor on slug-catcher volume, default 1.2.
  • available_slug_catcher_volume: optional available slug-catcher volume in m3 for a capacity check.

Outputs

  • mixture_velocity_m_per_s: sum of the superficial gas and liquid velocities.
  • froude_number: mixture Froude number using the pipe inside diameter.
  • liquid_fraction: liquid superficial velocity divided by the mixture velocity.
  • flow_regime_indicator: coarse public regime label (gas-dominated, slug, liquid-dominated, transition).
  • estimated_slug_volume_m3: screening slug volume from slug geometry and holdup.
  • recommended_slug_catcher_volume_m3: slug volume scaled by the surge factor.
  • capacity_ratio: recommended over available slug-catcher volume when an available volume is given.
  • slug_warning: ok, watch, or high.
  • assumptions: public assumptions used by the placeholder model.

Engineering Method

The Python class SlugScreeningModel uses open, published concepts only:

Read the full file on GitHub · 118 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. 1mo ago First seen · 118 lines · 69 tokens per session scan A 519d8264b3f7

Subscribe to this mod's changes

neqsim-multiphase-flow-slug-screening is a skill published in the GitHub repository equinor/neqsim-community-skills (4 stars, last pushed 4d ago), licensed Apache-2.0. It adds 69 tokens to every session and 1,478 once invoked, about $0.0003 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.

Related

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