Safety Critical Systems Handbook

1st Edition



  • David Smith
  • Kenneth Simpson
  • Description

    Safety Critical Systems Handbook: A Straightfoward Guide to Functional Safety, IEC 61508 (2010 Edition) and Related Standards, Including Process IEC 61511 and Machinery IEC 62061 AND ISO 13849, Third Edition, offers a practical guide to the functional safety standard IEC 61508. The book is organized into three parts. Part A discusses the concept of functional safety and the need to express targets by means of safety integrity levels. It places functional safety in context, along with risk assessment, likelihood of fatality, and the cost of conformance. It also explains the life-cycle approach, together with the basic outline of IEC 61508 (known as BS EN 61508 in the UK). Part B discusses functional safety standards for the process, oil, and gas industries; the machinery sector; and other industries such as rail, automotive, avionics, and medical electrical equipment. Part C presents case studies in the form of exercises and examples. These studies cover SIL targeting for a pressure let-down system, burner control system assessment, SIL targeting, a hypothetical proposal for a rail-train braking system, and hydroelectric dam and tidal gates.

    Key Features

    • The only comprehensive guide to IEC 61508, updated to cover the 2010 amendments, that will ensure engineers are compliant with the latest process safety systems design and operation standards
    • Helps readers understand the process required to apply safety critical systems standards
    • Real-world approach helps users to interpret the standard, with case studies and best practice design examples throughout


    Chemical, Process, Plant, Oil & Gas and related systems safety engineers

    Table of Contents

    A quick overview The 2010 version of IEC 61508 Acknowledgements Part A: The Concept of Safety Integrity 1 Chapter 1 The Meaning and Context of Safety Integrity Targets 1.1 Risk and the Need for Safety Targets 1.2 Quantitative and Qualitative Safety Targets 1.3 The Life-cycle Approach 1.4 Steps in the Assessment Process 1.5 Costs 1.6 The Seven Parts of IEC 61508 Chapter 2 Meeting IEC 61508 Part 1 2.1 Establishing Integrity Targets 2.2 ALARP (“As low as Reasonably Practicable 2.3 Functional Safety Management and Competence IEC 61508 Part 1 Chapter 3 Meeting IEC 61508 Part 2 3.1 Organizing and Managing the Life-cycle 3.2 Requirements Involving the Specification 3.3 Requirements for Design and Development 3.4 Integration and Test (Referred to as Verification 3.5 Operations and Maintenance 3.6 Validation (Meaning Overall Acceptance Test and the Close Out-of Actions) 3.7 Safety Manuals 3.8 Modifications 3.9 Acquired Sub-systems 3.10 “Proven in Use” (Referred to as Route 2s in the Standard 3.11 ASICs and CPU Chips 3.12 Conformance Demonstration Template IEC 61508 Part 2 Chapter 4 Meeting IEC 61508 Part 3 4.1 Organizing and Managing the Software Engineering 4.2 Requirements Involving the Specification 4.3 Requirements for Design and Development 4.4 Integration and Test (Referred to as Verification 4.5 Validation (Meaning Overall Acceptance Test and Close Out of Actions 4.6 Safety Manuals 4.7 Modifications 4.8 Alternative Techniques and Procedures 4.9 Data Driven Systems 4.10 Some Technical Comments 4.11 Conformance Demonstration Template IEC 61508 Part 3


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    © 2011
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    Electronic ISBN:

    About the authors

    David Smith

    Dr David J Smith is the Proprietor of Technis Consultancy. He has written numerous books on Reliability and Safety over the last 35 years. His FARADIP database has become widely used, and his other software packages are also used throughout the profession. His PhD thesis was on the subject of reliability prediction and common cause failure. He contributed to the first drafting of IEC 61508 and chairs the IGEM panel which produces SR/15 (the gas industry safety related guidance). David is past President of the Safety and Reliability Society.

    Affiliations and Expertise

    Independent Consultant, Technis, Tonbridge, UK

    Kenneth Simpson

    Kenneth G. L. Simpson is Managing Director of Engineering Safety Consultants Ltd and has been associated with safety related systems design and also with their assessment for over 40 years. He is a member of both the IEC61508 and IEC61511 drafting committees and the IGEM (SR15) panel, which writes the gas industry guidance. Following a career in aerospace, Ken has spent over 35 years in the control and safety system industry, has written a number of papers on the topic and gives frequent lectures.

    Affiliations and Expertise

    Independent Consultant, ESC, UK