Practical Hazops, Trips and Alarms

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Elsevier, 2004 M07 16 - 352 pages

Do you have trips and safety interlocks in your plant? Are they good enough or are they perhaps over-designed and much more expensive than necessary? Are you or your company aware of how Hazard Studies should define risk reduction requirements? Are you actually using Hazard Studies at all? The answer is the integrated approach to safety management. New international standards combined with well-proven hazard study methods can improve safety management in your company.

Practical Hazops, Trips and Alarms for Engineers and Technicians describes the role of hazard studies in risk management, and then proceeds with basic training in Hazop techniques. A number of practical exercises support the reference information and allow you to test your understanding of the material in the book.

This book aims to bridge the discipline gap between hazard studies and the provision of safety-related alarm and trip systems. It provides training in hazard and operability methods (Hazops) and in the principles of safety instrumented systems as defined by international standard IEC 61508.

  • Design an integrated safety management system to increase efficiency and reduce costs
  • Learn how to carry out hazard and operability studies (Hazops) and find out how to convert Hazop outputs into safety requirements specifications
  • Implement safety instrumented systems to the new IEC standards (IEC61508)

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1 Introduction to hazard studies
2 Hazard studies at levels 1 and 2
3 Risk reduction measures using alarms and trips
4 Hazop method
5 Planning and leadership of Hazops
6 Specifying safety instrumented systems
7 Hazard analysis methods
8 Factors in the choice of protection system
Software tools for hazard studies
EPA case study of phenol resin hazards
Expanded guideword table for continuous processes
Methods of reporting
Design and calibration of a risk graph
Data capture sheet
Glossary of terms used in hazard studies and safety related systems
Practical exercises

9 Exercise in specifying an SIS from the Hazop
References used in the manual
Some websites for safety systems information
Notes on national regulations relevant to hazard study and safety management
Answers to practical exercises

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Page 16 - Tolerable only if risk reduction is impracticable or if its cost is grossly disproportionate to the improvement gained Tolerable if cost of reduction would exceed the improvement gained Necessary to maintain assurance that risk remains at this level Negligible risk way.
Page 2 - an inherent physical or chemical characteristic that has the potential for causing harm to people, property, or the environment...
Page 24 - ... the safety management system should include the part of the general management system which includes the organizational structure, responsibilities, practices, procedures, processes and resources for determining and implementing the...
Page 13 - RISK CLASS INTERPRETATION Class I intolerable risk Class II undesirable risk, and tolerable only if risk reduction is impracticable or if the costs are grossly disproportionate to the improvement gained Class III tolerable risk if the cost of risk reduction would exceed the improvement gained Class IV negligible risk...
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About the author (2004)

Dave Macdonald has throughout his career been involved in the application of instrumentation and control technology to industrial and chemical processes. As a senior instrument engineer with AECI Ltd he specialised in managing the complete design cycle for process control systems from conceptual design to commissioning. He has also developed and lectured a post-graduate course in Industrial Control Systems. Dave has been closely involved in hazard studies for new chemical plants and in the implementation of safety instrumented systems. His expertise ranging from field instrumentation to software quality assurance is particularly relevant to this subject.. In the past few years Dave has lectured on Safety Instrumentation and related topics to many hundreds of Engineers and Technicians in Ireland, Canada the UK, Australia, New Zealand and South Africa.

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