BS-EN-60300-3-4-2008.pdf

Dependability management Part 3-4: Application guide Guide to the specification of dependability requirements BS EN 60300-3-4:2008 raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI British Standards Licensed CopyChinese University of Hong Kong, 11/04/2009 09:19, Uncontrolled Copy, (c) BSI National foreword This British Standard is the UK implementation of EN 60300-3-4:2008. It is identical to IEC 60300-3-4:2007. It supersedes BS 5760-4:2003 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee DS/1, Dependability and terotechnology. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. © BSI 2009 ISBN 978 0 580 56184 9 ICS 03.100.40; 03.120.01; 21.020; 29.020 BRITISH STANDARDBS EN 60300-3-4:2008 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on Amendments issued since publication Amd. No. Date Text affected March312009 Licensed CopyChinese University of Hong Kong, 11/04/2009 09:19, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 60300-3-4 NORME EUROPÉENNE EUROPÄISCHE NORM January 2008 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels © 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60300-3-4:2008 E ICS 03.100.40; 03.120.01 English version Dependability management - Part 3-4: Application guide - Guide to the specification of dependability requirements (IEC 60300-3-4:2007) Gestion de la sûreté de fonctionnement - Partie 3-4: Guide d'application - Spécification d'exigences de sûreté de fonctionnement (CEI 60300-3-4:2007) Zuverlässigkeitsmanagement - Teil 3-4: Anwendungsleitfaden - Anleitung zum Festlegen von Zuverlässigkeitsforderungen (IEC 60300-3-4:2007) This European Standard was approved by CENELEC on 2007-12-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Licensed CopyChinese University of Hong Kong, 11/04/2009 09:19, Uncontrolled Copy, (c) BSI EN 60300-3-4:2008 2 Foreword The text of document 56/1212/FDIS, future edition 2 of IEC 60300-3-4, prepared by IEC TC 56, Dependability, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60300-3-4 on 2007-12-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2008-09-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-12-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60300-3-4:2007 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60812 NOTE Harmonized as EN 60812:2006 (not modified). IEC 61165 NOTE Harmonized as EN 61165:2006 (not modified). IEC 61508-1 NOTE Harmonized as EN 61508-1:2001 (not modified). IEC 61508-2 NOTE Harmonized as EN 61508-2:2001 (not modified). IEC 61508-3 NOTE Harmonized as EN 61508-3:2001 (not modified). IEC 61508-4 NOTE Harmonized as EN 61508-4:2001 (not modified). IEC 61508-5 NOTE Harmonized as EN 61508-5:2001 (not modified). IEC 61508-6 NOTE Harmonized as EN 61508-6:2001 (not modified). IEC 61508-7 NOTE Harmonized as EN 61508-7:2001 (not modified). IEC 61709 NOTE Harmonized as EN 61709:1998 (not modified). _ BS EN 60300-3-4:2008 Licensed CopyChinese University of Hong Kong, 11/04/2009 09:19, Uncontrolled Copy, (c) BSI 3 EN 60300-3-4:2008 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60050-191 1) International Electrotechnical Vocabulary (IEV) - Chapter 191: Dependability and quality of service IEC 60300-1 1) Dependability management - Part 1: Dependability management systems EN 60300-1 2003 2) IEC 60300-2 1) Dependability management - Part 2: Guidelines for dependability management EN 60300-2 2004 2) IEC 60300-3-1 1) Dependability management - Part 3-1: Application guide - Analysis techniques for dependability - Guide on methodology EN 60300-3-1 2004 2) IEC 60300-3-2 1) Dependability management - Part 3-2: Application guide - Collection of dependability data from the field EN 60300-3-2 2005 2) IEC 60300-3-3 1) Dependability management - Part 3-3: Application guide - Life cycle costing EN 60300-3-3 2004 2) IEC 60300-3-5 1) Dependability management - Part 3-5: Application guide - Reliability test conditions and statistical test principles IEC 60300-3-10 1) Dependability management - Part 3-10: Application guide - Maintainability IEC 60300-3-12 1) Dependability management - Part 3-12: Application guide - Integrated logistic support EN 60300-3-12 2004 2) IEC 60300-3-14 1) Dependability management - Part 3-14: Application guide - Maintenance and maintenance support EN 60300-3-14 2004 2) 1) Undated reference. 2) Valid edition at date of issue. BS EN 60300-3-4:2008 Licensed CopyChinese University of Hong Kong, 11/04/2009 09:19, Uncontrolled Copy, (c) BSI EN 60300-3-4:2008 4 Publication Year Title EN/HD Year IEC 60605-4 1) Equipment reliability testing - Part 4: Statistical procedures for exponential distribution - Point estimates, confidence intervals, prediction intervals and tolerance intervals IEC 60605-6 1) Equipment reliability testing - Part 6: Tests for the validity and estimation of the constant failure rate and constant failure intensity IEC 60706-2 1) Maintainability of equipment - Part 2: Maintainability requirements and studies during the design and development phase EN 60706-2 2006 2) IEC 60706-3 1) Maintainability of equipment - Part 3: Verification and collection, analysis and presentation of data EN 60706-3 2006 2) IEC 60706-5 1) Maintainability of equipment - Part 5: Testability and diagnostic testing EN 60706-5 2007 2) IEC 61014 1) Programmes for reliability growth EN 61014 2003 2) IEC 61025 1) Fault Tree Analysis (FTA) EN 61025 2007 2) IEC 61070 1) Compliance test procedures for steady-state availability IEC 61078 1) Analysis techniques for dependability - Reliability block diagram and Boolean methods EN 61078 2006 2) IEC 61123 1) Reliability testing - Compliance test plans for success ratio IEC 61124 1) Reliability testing - Compliance tests for constant failure rate and constant failure intensity EN 61124 2006 2) IEC 61160 1) Design review EN 61160 2005 2) IEC 61164 1) Reliability growth - Statistical test and estimation methods EN 61164 2004 2) IEC 61508 Series Functional safety of electrical/electronic/programmable electronic safety-related systems EN 61508 Series IEC 61649 1) Goodness-of-fit tests, confidence intervals and lower confidence limits for Weibull distributed data IEC 61703 1) Mathematical expressions for reliability, availability, maintainability and maintenance support terms EN 61703 2002 2) IEC 61710 1) Power law model - Goodness-of-fit tests and estimation methods IEC 61713 1) Software dependability through the software life-cycle processes - Application guide BS EN 60300-3-4:2008 Licensed CopyChinese University of Hong Kong, 11/04/2009 09:19, Uncontrolled Copy, (c) BSI 5 EN 60300-3-4:2008 Publication Year Title EN/HD Year IEC 62198 1) Project risk management - Application guidelines IEC 62308 1) Equipment reliability - Reliability assessment methods EN 62308 2006 2) IEC 62347 1) Guidance on system dependability specifications EN 62347 2007 2) BS EN 60300-3-4:2008 Licensed CopyChinese University of Hong Kong, 11/04/2009 09:19, Uncontrolled Copy, (c) BSI This page deliberately left blank EN 60300-3-4:2008 BS EN 60300-3-4:2008 Licensed CopyChinese University of Hong Kong, 11/04/2009 09:19, Uncontrolled Copy, (c) BSI 2 60300-3-4 © IEC:2007 CONTENTS INTRODUCTION.6 1 Scope.7 2 Normative references .7 3 Terms and definitions .9 4 General considerations for dependability specifications9 4.1 The need for dependability 9 4.2 Requirements and goals11 4.3 Systems 11 4.4 Demonstration of achievement of requirements .13 4.4.1 Concept.13 4.4.2 Activities14 4.5 Contracting for dependability.15 4.6 Types of specification16 4.7 Derivation of dependability specifications 17 5 Dependability management 18 6 Availability19 6.1 General.19 6.1.1 Choice of dependability characteristic19 6.1.2 Relationship between availability, reliability and maintainability.19 6.2 Availability specifications.20 6.2.1 Quantitative requirements20 6.2.2 Qualitative requirements20 6.3 Provision of availability verification and validation .20 6.3.1 General .20 6.3.2 Verification and validation by testing21 6.3.3 Verification and validation by analysis .21 7 Reliability .21 7.1 General.21 7.2 Reliability specification22 7.2.1 Quantitative requirements22 7.2.2 Qualitative requirements23 7.3 Reliability verification and validation24 7.3.1 General .24 7.3.2 Verification and validation by testing24 7.3.3 Verification and validation by analysis .25 8 Maintainability 25 8.1 General.25 8.2 Maintainability specification.25 8.2.1 Quantitative requirements25 8.2.2 Qualitative requirements26 8.3 Maintainability verification and validation.26 9 Maintenance support 27 9.1 General.27 9.2 Maintenance support specification.27 BS EN 60300-3-4:2008 Licensed CopyChinese University of Hong Kong, 11/04/2009 09:19, Uncontrolled Copy, (c) BSI 60300-3-4 © IEC:2007 3 9.2.1 Quantitative requirements27 9.2.2 Qualitative requirements28 9.3 Maintenance support verification and validation 28 Annex A (informative) Reference standards for verification and validation techniques29 Annex B (informative) Examples of reliability, maintainability, maintenance support and availability requirements 31 Bibliography33 Figure 1 Relationship between cost and reliability10 Figure 2 System elements12 Table A.1 Techniques for dependability verification and validation through testing.29 Table A.2 Techniques for dependability verification and validation through analysis.30 BS EN 60300-3-4:2008 Licensed CopyChinese University of Hong Kong, 11/04/2009 09:19, Uncontrolled Copy, (c) BSI 6 60300-3-4 © IEC:2007 INTRODUCTION In many systems, reliability, maintainability and availability are essential performance characteristics. These characteristics, together with maintenance support performance, are known collectively as dependability. In systems where any of the dependability characteristics are important, it is necessary that these characteristics should be defined and specified in the same way as other system characteristics such as technical performance, dimensions and mass. The levels of reliability, maintainability, availability and maintenance support performance achieved by a system depend on the conditions under which the system is used and also on the mission profile of the system. When requirements for dependability characteristics are specified, it is necessary to define the conditions of storage, transportation, installation and use that will be applied to the system. It may be important to take account not only of the conditions under which the system will operate, but also of the maintenance policy and organization for maintenance support of the system. In order to assess the values of the dependability characteristics achieved, it is necessary to use statistical methods. Dependability characteristics may be specified, like other performance characteristics, in three different ways: 1) specifications written by the supplier; 2) specifications written by the purchaser; 3) specifications mutually agreed or written by the supplier and the purchaser. This standard is applicable to all three types of specification. This standard complements IEC 62347 which deals with the definitions of systems and their constituent elements and how to define these so that the dependability requirements of each element can be specified using this standard. The premise of IEC 62347 is to identify system requirements by functions from a system engineering perspective. It provides a process for transforming the purchasers view on system applications into a technical view for engineering the system. IEC 62347 emphasises architectural and functional design for realisation of functions with appropriate selection of hardware, software and human elements to achieve the system dependability requirements relevant to the purchasers needs. BS EN 60300-3-4:2008 Licensed CopyChinese University of Hong Kong, 11/04/2009 09:19, Uncontrolled Copy, (c) BSI 60300-3-4 © IEC:2007 7 DEPENDABILITY MANAGEMENT Part 3-4: Application guide Guide to the specification of dependability requirements 1 Scope This part of IEC 60300 gives guidance on specifying the required dependability characteristics in specifications, together with specifications of procedures and criteria for verification and validation. The guidance provided includes the following: advice on specifying quantitative and qualitative reliability, maintainability, ava