IEC 61508

Assessing the Hazard and Risk

April 1999

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Table of Contents

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IEC 61508 Assessing the Hazard and Risk

IEC 61508 Terminology

IEC 61508 Definitions

IEC 61508 Definitions

IEC 61508 Definitions

IEC 61508 Definitions

IEC 61508 Definitions

IEC 61508 Definitions

IEC 61508 Terminology Hierarchy

The Functional Safety Assessment

Tolerable Risk Criteria

Tolerable Risk Criteria

Tolerable Risk Criteria

Boundary of FSA

Risk Graph Method

Hazardous Event Severity Index Method

Summary Points

Summary Points

Summary Points

Example Application of Risk Graph Method

Example - Initial Design

Example - Pressure Relief Valve Removed

Example - Risk Graph Method

Example - Tolerable Risk Criteria

Example - Tolerable Risk Criteria

Example - Tolerable Risk Criteria

Example - Tolerable Risk Criteria

Example - Block Diagram for Reliability Calculations

Example - Final Design Solution

Example - Initial Design

Example - No Over Pressure Protection

Example - Risk Graph Method

Example - Tolerable Risk Criteria

Example - Tolerable Risk Criteria

Example - Tolerable Risk Criteria

Example - Block Diagram for Reliability Calculations

Example - Final Design Solution

Summary of Example

Summary of Example

Summary of Example

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Author: Simon Dean

Email: simon.dean@sauf.co.uk

Home Page: www.sauf.co.uk