The safe isolation of plant and equipment (HSG253) - Health and ...

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© Crown copyright 2006 First published 1997 ISBN 978 0 7176 6176 8 Health and Safety Executive All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording or otherwise) without the prior written permission of the copyright owner. Applications for reproduction should be made in writing to: The Office of Public Sector Information, Information Policy Team, Kew, Richmond, Surrey TW9 4DU or e-mail: licensing@opsi.gov.uk This guidance is issued by the Health and Safety Executive. Following the guidance is not compulsory and you are free to take other action. But if you do follow the guidance you will normally be doing enough to comply with the law. Health and safety inspectors seek to secure compliance with the law and may refer to this guidance as illustrating good practice. Page 2 of 81
Contents Foreword 4 Introduction 5 Scope and target audience 5 Legal considerations 6 Risk reduction and ALARP 6 Overview of isolation hazards 7 Management of isolations 7 Basic principles 7 Design 8 Human factors 10 Roles and responsibilities 12 Training and competence 14 Monitoring, audit and review 15 Setting performance indicators for isolation activities 17 Safe systems of work for isolation activities 17 Work control systems 17 Documentation 17 Controlling interactions with other work/systems 18 Controlling changes 19 Key stages of process isolation 21 Hazard identification 22 Risk assessment and selection of isolation scheme 23 Planning and preparation of equipment 31 Installation of the isolation 32 Draining, venting, purging and flushing 34 Testing and monitoring effectiveness of the isolation 35 Reinstatement of the plant 38 Isolation situations requiring specific considerations 39 Own isolations 39 Arrangements for large-scale isolations 41 Extended isolations 42 Health and Safety Executive Appendices 42 1 Legal requirements 42 2 Non-process isolation hazards 44 3 Checklists for monitoring and review 47 4 Valve types and issues 50 5 Isolation methods 52 6 Example of a selection tool to establish the ‘baseline standard’ for a final isolation 59 7 Pipeline isolation requirements 68 8 Draining, venting, purging and flushing activities 72 9 Isolations for instrument work 75 References and further reading 77 Glossary 79 The safe isolation of plant and equipment Page 3 of 81
Page 1: The safe isolation of plant and equ
Page 5 and 6: Introduction Scope and target audie
Page 7 and 8: Overview of isolation hazards Healt
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Page 11 and 12: 43 Human failures can be grouped in
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Page 17 and 18: Setting performance indicators for
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Page 23 and 24: Health and Safety Executive Hazards
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Page 29 and 30: Figure 5 Flowchart for selection of
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Page 33 and 34: Level of security Methods Typical a
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Page 49 and 50: 3 PLANNING and IMPLEMENTING Risk as
Page 51 and 52: Valve type Sealing ability Ball Goo
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Technique Brief description Primary
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Technique Brief description Special
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Technique Brief description Special
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Substance Pressure Appendix 6: Exam
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Health and Safety Executive 8 For m
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Release factor Health and Safety Ex
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Summary of considerations when usin
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Health and Safety Executive A secti
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valving to provide double block and
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Health and Safety Executive 19 You
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Venting or flaring activities Healt
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Appendix 9: Isolations for instrume
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Health and Safety Executive Referen
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Glossary Health and Safety Executiv
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Further information Health and Safe
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