sil-calculator

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