neqsim-consequence-analysis

neqsim-consequence-analysis is a skill for Claude Code, Codex from equinor/neqsim. It costs 124 tokens per session (3,280 once invoked), scanned A, original, Apache-2.0.

A quantitative safety-analysis tool for oil and gas release scenarios. It estimates effects such as fire heat, explosion pressure, toxic or flammable gas spread, and possible fatality risk.

In plain words
What is it for?
Use it to model jet fires, pool fires, vapour-cloud explosions, BLEVE events, gas dispersion, fatality probabilities, and individual or societal risk. It can also produce source terms for other consequence-analysis programs.
Why use it?
It turns a release scenario into measurable safety consequences, helping analysts understand how far hazards may reach and how severe they may be.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/equinor/neqsim/neqsim-consequence-analysis
Any agent
npx skills add equinor/neqsim --skill neqsim-consequence-analysis
Clone the repo
git clone --depth 1 https://github.com/equinor/neqsim

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-consequence-analysis

README.md
[![agentmods](https://agentmods.dev/badge/skills/equinor/neqsim/neqsim-consequence-analysis.svg)](https://agentmods.dev/skills/equinor/neqsim/neqsim-consequence-analysis)
Your own site
<a href="https://agentmods.dev/skills/equinor/neqsim/neqsim-consequence-analysis"><img src="https://agentmods.dev/badge/skills/equinor/neqsim/neqsim-consequence-analysis.svg" alt="Measured on agentmods" height="20"></a>
Per session 124 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,280 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00124 $0.03280
Opus 5 $0.00062 $0.01640
Sonnet 5 $0.00025 $0.00656
Haiku 4.5 $0.00012 $0.00328

Measured 5d ago against content hash 61bcb8355e7a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

neqsim-consequence-analysis 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 5d 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.

.github/skills/neqsim-consequence-analysis/SKILL.md · 273 lines

How it starts

The opening of the file, as written. The whole thing — 273 lines — stays where its author put it; the contents beside it link to each section on GitHub.

NeqSim Consequence Analysis Skill

Quantitative consequence modelling that converts a release scenario (mass flow, inventory, ignition probability) into thermal radiation contours, overpressure contours, dispersion footprints, and finally individual / societal fatality risk per ISO 17776, NORSOK Z-013, API 752 and the CCPS Guidelines for Chemical Process Quantitative Risk Analysis.

When to Use

  • Jet-fire, pool-fire, VCE or BLEVE source-term modelling
  • Toxic / flammable dispersion to LFL, IDLH, ERPG-2/3 or 1 % fatality contours
  • Probit-based fatality probability for thermal radiation, overpressure or toxic dose
  • QRA roll-up: combine release frequency × ignition probability × fatality probability
  • Source-term generation as input to PHAST / FLACS / KFX

Distinct from neqsim-process-safety (HAZOP / LOPA / SIL — frequency side) and neqsim-relief-flare-network (PSV sizing / flare radiation — design side). This skill is the consequence side of QRA.

Standards

  • API 521 §6 — flare and vent radiation, fire heat input
  • API 752 / 753 / 756 — facility siting, occupied buildings
  • NORSOK Z-013 / S-001 — risk acceptance, fire & explosion loads
  • CCPS QRA Guidelines — probit constants, ignition probabilities
  • TNO Yellow Book — multi-energy / Baker-Strehlow VCE
  • EI 15 — hazardous area classification

Method 1 — Jet Fire (API 521 + CCPS solid-flame)

import neqsim.process.safety.fire.JetFireModel;
import neqsim.process.safety.dispersion.ProbitModel;

// 30 kg/s gas leak, 50 MJ/kg HoC, 25 % radiative fraction
JetFireModel jet = new JetFireModel(30.0, 50.0e6, 0.25);
double flux50m = jet.radiationFluxAt(50.0);   // W/m²
double dist125 = jet.distanceForFlux(12500.0); // m where flux = 12.5 kW/m²

Typical thermal radiation criteria (API 521 / NORSOK S-001):

Flux (kW/m²) Effect Use
1.6 No discomfort for long exposure Public area limit
4.7 Sufficient for evacuation in 30 s Escape route
12.5 Wood ignites, equipment failure (5 min) Process equipment limit
37.5 Structural failure of process equipment Damage to steel structure

Read the full file on GitHub · 273 lines

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. 5d ago First seen · 273 lines · 124 tokens per session scan A 61bcb8355e7a

Subscribe to this mod's changes

neqsim-consequence-analysis is a skill published in the GitHub repository equinor/neqsim (150 stars, last pushed today), licensed Apache-2.0. It adds 124 tokens to every session and 3,280 once invoked, about $0.0006 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 2026-08-30.

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