Reliability Centered Maintenance (RCM) This page intentionally left blank Reliability Centered Maintenance (RCM) Implementation Made Simple Neil Bloom McGraw-Hill,Inc. New York Chicago San Francisco Lisbon London Madrid Mexico City Milan New Delhi San Juan Seoul Singapore Sydney Toronto Copyright © 2006 by the McGraw-Hill Companies. All rights reserved. Manufactured in the United States of America. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher. 0-07-158918-X The material in this eBook also appears in the print version of this title: 0-07-146069-1. All trademarks are trademarks of their respective owners. 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To my wife,friend,partner,and soul mate, Bernadette,who is indeed a saint This page intentionally left blank For more information about this title, click here Contents Preface xiii Acknowledgments xix Chapter 1 Introduction to RCM 1 1.1 Uncovering the Fuzziness and Mystique of RCM 4 1.2 The Background of RCM 9 1.3 A No-Nonsense Approach to RCM 11 1.4 RCM as a Major Factor in the Bottom Line 12 Chapter 2 Why RCM Has Historically Been So Difficult to Implement 15 2.1 Consultants 15 2.2 A White Elephant 16 2.3 Reasons for Failure 18 2.3.1 Loss of In-House Control 18 2.3.2 An Incorrect Mix of Personnel Performing the Analysis 19 2.3.3 Unnecessary and Costly Administrative Burdens 20 2.3.4 Fundamental RCM Concepts Not Understood 21 2.3.5 Confusion Determining System Functions 21 2.3.6 Confusion Concerning System Boundaries and Interfaces 21 2.3.7 Divergent Expectations 23 2.3.8 Confusion Regarding Convention 24 2.3.9 Misunderstanding “Hidden”Failures and Redundancy 24 2.3.10 Misunderstanding Run-to-Failure 25 2.3.11 Inappropriate Component Classifications 25 2.3.12 Instruments Were Not Included as Part of the RCM Analysis 26 Chapter 3 Fundamental RCM Concepts Explained, Some for the Very First Time:The Next Plateau 27 3.1 The Three Phases of an RCM-Based Preventive Maintenance Program 30 3.2 The Three Cornerstones of RCM 32 3.3 Hidden Failures,Redundancy,and Critical Components 34 3.4 Testing Hidden Systems 45 vii viii Contents 3.5 The Missing Link:Potentially Critical Components 46 3.6 Commitment Components 50 3.7 Economic Components 51 3.8 The “Canon Law”of Run-to-Failure Components 52 3.9 The Integration of Preventive and Corrective Maintenance and the Distinction Between Potentially Critical and Run-to-Failure Components 57 3.9.1 An RTF CM versus a Critical CM:Which Takes Priority for Getting Worked First? 59 3.10 The Anatomy of a Disaster 61 3.11 A Deeper Look at Critical Components,Potentially Critical Components,and Hidden Failures—How They All Fit Together 65 3.12 Finding the Anomalies 68 3.13 Failures Found During Operator Rounds 70 3.14 Redundant,Standby,and Backup Functions 70 3.15 Typical Examples of Component Classifications 73 3.16 Component Classification Hierarchy 73 3.17 The Defensive Strategies of a PM Program 75 3.18 Eliminating the Requirement for Identifying Boundaries and Interfaces 75 3.19 Functions and Functional Failures Are Identified at the Component Level,Not the System and Subsystem Level 77 3.20 The Quest for the Consequence of Failure 79 3.21 The COFA versus the FMEA 81 3.22 How Do You Know When Your Plant Is Reliable? 83 3.23 Chapter Summary 85 Chapter 4 RCM Implementation:Preparation and Tools 89 4.1 Preparation 90 4.2 The Sequential Elements Needed for the Analysis 91 4.2.1 A Simple but Comprehensive Alphanumeric Equipment I.D.Database 91 4.2.2 Informational Resources 93 4.2.3 Establishing Convention 94 4.2.4 Specialized Workstations and Software 94 4.2.5 The COFA Excel Spreadsheet versus the FMEA 95 4.2.6 The PM Task Worksheet 100 4.2.7 The Economic Evaluation Worksheet 102 4.3 Chapter Summary 105 Chapter 5 RCM Made Simple:Implementation Process 107 5.1 Define Your Asset Reliability Strategy 109 5.2 Understanding the RCM COFA Logic Tree,the Potentially Critical Guideline,and the Economically Significant Guideline 112 5.3 Completing the COFA Worksheet in Conjunction with the COFA Logic Tree,the Potentially Critical Guideline, and the Economically Significant Guideline 120 5.3.1 Describe the Component Functions 121