Babysitter sil-calculator

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

install

source · Clone the upstream repo

git clone https://github.com/a5c-ai/babysitter

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/a5c-ai/babysitter "$T" && mkdir -p ~/.claude/skills && cp -r "$T/library/specializations/domains/science/chemical-engineering/skills/sil-calculator" ~/.claude/skills/a5c-ai-babysitter-sil-calculator && rm -rf "$T"

manifest: library/specializations/domains/science/chemical-engineering/skills/sil-calculator/SKILL.md

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