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Safety Integrity Level calculation skill for SIF design and verification per IEC 61511

QUICK START

How to use this skill

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  2. Copy the prompt below and paste it into your agent.
  3. Review the proposed files and risks before you approve installation.
Prompt to paste
I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/a5c-ai/babysitter/blob/HEAD/library/specializations/domains/science/chemical-engineering/skills/sil-calculator/SKILL.md

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First, summarize what it does, its dependencies, license status if identifiable, and any risks. Show the exact files you propose to add under .agents/skills/sil-calculator/. Do not write files or run scripts until I approve.

After I approve, install the complete skill folder, including required referenced files, into that project location. Verify it is discoverable, then tell me its actual invocation name and how to use it. Do not claim it is installed until you have verified it.

Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

SIL Calculator Skill

Purpose

The SIL Calculator Skill determines Safety Integrity Levels for Safety Instrumented Functions and verifies SIF designs meet required risk reduction per IEC 61511.

Capabilities

  • SIL determination (risk graph, LOPA, risk matrix)
  • PFDavg calculations
  • Proof test interval optimization
  • Common cause failure analysis
  • Hardware fault tolerance verification
  • Diagnostic coverage assessment
  • Systematic capability evaluation
  • SIF verification calculations

Usage Guidelines

When to Use

  • Determining SIL requirements
  • Designing safety instrumented functions
  • Verifying SIF performance
  • Optimizing proof test intervals

Prerequisites

  • HAZOP recommendations available
  • Risk criteria defined
  • Component failure data available
  • Architecture selected

Best Practices

  • Use consistent methodology
  • Document all assumptions
  • Consider common cause failures
  • Verify systematic capability

Process Integration

This skill integrates with:

  • Safety Instrumented System Design
  • HAZOP Study Facilitation
  • Pressure Relief System Design

Configuration

sil-calculator:
  determination-methods:
    - risk-graph
    - lopa
    - risk-matrix
  failure-databases:
    - OREDA
    - SINTEF
    - exida

Output Artifacts

  • SIL determination reports
  • PFDavg calculations
  • SIF specifications
  • Verification reports
  • Test interval recommendations