1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58and studies during the design and development phaseThe European Standard EN 60706-2:2006 has the st
2、atus of a British Standard ICS 03.120.01; 21.020Maintainability of equipment Part 2: Maintainability requirements BRITISH STANDARDBS EN 60706-2:2006BS EN 60706-2:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2006 BSI 2006ISBN
3、 0 580 49313 XAmendments issued since publicationAmd. No. Date CommentsThis publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National
4、forewordThis British Standard was published by BSI. It is the UK implementation of EN 60706-2:2006. It is identical with IEC 60706-2:2006. It supersedes BS 6548-2:1992 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee DS/1, Dependability and terotechnolo
5、gy.A list of organizations represented on DS/1 can be obtained on request to its secretary.EUROPEAN STANDARD EN 60706-2 NORME EUROPENNE EUROPISCHE NORM June 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Ele
6、ktrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60706-2:2006 E ICS 03.120.01; 21.020 English version Maintainability of equipment Part 2: Maint
7、ainability requirements and studies during the design and development phase (IEC 60706-2:2006) Maintenabilit de matriel Partie 2 : Exigences et tudes de maintenabilit pendant la phase de conception et de dveloppement (CEI 60706-2:2006) Instandhaltbarkeit von Gerten Teil 2: Instandhaltbarkeitsanforde
8、rungen und Studien in der Entwicklungsphase (IEC 60706-2:2006) This European Standard was approved by CENELEC on 2006-05-01. 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 standar
9、d 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
10、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, Cyprus, the Czech Republic, Denmark,
11、 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. Foreword The text of document 56/1090/FDIS, future edition 2
12、of IEC 60706-2, prepared by IEC TC 56, Dependability, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60706-2 on 2006-05-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national st
13、andard or by endorsement (dop) 2007-02-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-05-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60706-2:2006 was approved by CENELEC as a European S
14、tandard without any modification. _ 2 EN 60706-2:2006CONTENTS 1 2 3 3.1 3.2 4 5 6 6.1 6.2 6.3 6.4 6.5 6.6 7 7.1 7.2 7.3 7.4 7.5 8 8.1 8.2 8.3 8.4 9 9.1 9.2 9.3 Annex C (informative) Example of allocation of reliability values and maintenance 3 EN 60706-2:2006INTRODUCTION.5 Scope.6 Normative referenc
15、es .6 Terms, definitions and acronyms 7 Terms and definitions 7 Acronyms 8 General approach.8 Principle of maintainability9 Maintainability activities in the life cycle .9 General .9 Concept and definition phase 10 Design and development phase.10 Manufacture and installation phase .11 Operation and
16、maintenance phases 11 Disposal phase11 Specification of maintainability requirements 12 Statement of maintainability requirements .12 Maintainability characteristics13 Constraints15 Maintainability programme requirements .16 Verification 16 Maintainability studies in the design and development phase
17、 .17 General .17 Objectives .17 Maintainability studies in the design process .17 Analysis tools and procedures.22 Design support .29 Liaison 29 Design criteria and check-lists.30 Design reviews31 Annex A (informative) Maintainability allocation .33 Annex B (informative) Example of a maintainability
18、 allocation40 Bibliography50strategy selection for a system with non-constant failure rate .43 Annex ZZA (normative) Normative references to international publications with their corresponding European publications .51 Figure 1 Maintainability studies in the design process41 Figure 2 Hardware level
19、maintainability block diagram .49 Figure 3 Basic steps in maintainability prediction .53 Figure A.1 =MACMTACMTMACMTACMT9550f .77 Figure A.2 Maintainability allocation to sub-item level 79 Figure B.1 Functional level diagram .83 Figure C.1 Weibull plot of the components in the system .99 Table 1 Exam
20、ples of quantitative maintainability characteristics.27 Table 2 Detailed tasks in maintainability studies 43 Table A.1 M allocation to sub-item level.75 Table B.1 Allocation table 85 Table C.1 Comparison of costs 97 4 EN 60706-2:2006INTRODUCTION Maintainability is a characteristic that defines the e
21、ase with which an item can be maintained and supported during its period of use. Maintainability has to be built into an item during the design and development phase and it is therefore important that maintainability requirements be established as part of the initial specification. The IEC 60706 ser
22、ies of standards is intended to give guidance on how a designer should best incorporate high standards of maintainability into a product so that the cost of maintenance is reduced to an acceptable level. It is also important to ensure that the necessary maintenance can be undertaken to keep the prod
23、uct in a safe condition and that it can be operated to its required performance. This International Standard gives an introduction to the concept of maintainability, and guidance as to how maintainability can be incorporated into specifications and contracts and how maintainability should be conside
24、red as part of the design process. It forms part of a hierarchy of standards on dependability as described below. IEC 60300-1 and IEC 60300-2 are the IEC top-level standards that provide guidance on how to incorporate dependability, including reliability, availability and maintainability, into manuf
25、actured products. IEC 60300-3-10 is the top-level standard on maintainability, serving as an application guide and which forms part of the IEC 60300-3 series of standards. It can be used to implement a maintainability programme covering the initiation, development and in-service phases of a product,
26、 which form part of the tasks described in IEC 60300-2. It also provides guidance on how the maintenance aspects of the tasks should be considered in order to achieve optimum maintainability. 5 EN 60706-2:2006MAINTAINABILITY OF EQUIPMENT Part 2: Maintainability requirements and studies during the de
27、sign and development phase 1 Scope This part of IEC 60706 examines the maintainability requirements and related design and use parameter, and discusses some activities necessary to achieve the required maintainability characteristics and their relationship to planning of maintenance. It describes th
28、e general approach in reaching these objectives and shows how maintainability characteristics should be specified in a requirements document or contract. It is not intended to be a complete guide on how to specify or to contract for maintainability. Its purpose is to define the range of consideratio
29、ns when maintainability characteristics are included as requirements for the development or the acquisition of an item. The standard goes on to describe maintainability studies in the preliminary and detailed design phases and their relationships to other maintainability and maintenance support task
30、s, described in associated standards. Maintainability considerations in design reviews are also included. It is intended that customers acquiring items of equipment will find this standard useful in assisting them to define their maintainability objectives and associated maintainability programmes.
31、2 Normative references 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. IEC 60050(191):1990, Inter
32、national Electrotechnical Vocabulary (IEV) Chapter 191: Dependability and quality of service IEC 60300-3-1, Dependability management Part 3-1: Application guide Analysis techniques for dependability Guide on methodology IEC 60300-3-3, Dependability management Part 3-3: Application guide Life cycle c
33、osting IEC 60300-3-10:2001, Dependability management Part 3-10: Application guide Maintain-ability IEC 60300-3-11, Dependability management Part 3-11: Application guide Reliability centred maintenance 6 EN 60706-2:2006IEC 60300-3-12, Dependability management Part 3-12: Application guide Integrated l
34、ogistic support IEC 60300-3-14, Dependability management Part 3-14: Application guide Maintenance and maintenance support IEC 60706-3, Guide on maintainability of equipment Part 3: Sections Six and Seven Verification and collection, analysis and presentation of data 1IEC 60706-5, Guide on maintainab
35、ility of equipment Part 5 Section 4: Diagnostic testing IEC 60812, Analysis techniques for system reliability Procedure for failure mode and effects analysis (FMEA) IEC 61025, Fault tree analysis (FTA) IEC 61160, Design review IEC 61649, Goodness-of-fit tests, confidence intervals and lower confiden
36、ce limits for Weibull distributed data 3 Terms, definitions and acronyms For the purposes of this document, the terms and definitions given in IEC 60050(191) apply, together with the following: 3.1 Terms and definitions 3.1.1 maintainability (performance) ability of an item under given conditions of
37、 use, to be retained in, or restored to, a state in which it can perform a required function, when maintenance is performed under given conditions and using stated procedures and resources NOTE The term “maintainability“ is also used as a measure of maintainability performance (see 191-13-01). IEV 1
38、91-02-07:1990 3.1.2 maintainability probability that a given maintenance action, for an item under given conditions of use, can be carried out within a stated time interval, when the maintenance is performed under stated conditions and using stated procedures and resources NOTE The term “maintainabi
39、lity“ is also used to denote the maintainability performance quantified by this probability (see 191-02-07:1990). IEV 191-13-01:1990 _ 1 A second edition is due to be published shortly under the revised title “Maintainability of equipment Part 3: Verification and collection, analysis and presentatio
40、n of data”. 7 EN 60706-2:20063.1.3 maintenance combination of all technical and administrative actions, including supervision actions, intended to retain an item in, or restore it to, a state in which it can perform a required function IEV 191-07-01:1990 3.1.4 maintenance concept interrelationship b
41、etween the maintenance echelons, the indenture levels and the levels of maintenance to be applied for the maintenance of an item 3.1.5 maintenance policy general approach to the provision of maintenance and maintenance support based on the objectives and policies of owners, users and customers 3.2 A
42、cronyms BITE built-in test equipment FMEA failure modes and effects analysis FTA fault tree analysis ILS integrated logistic support LCC life cycle cost LRU line replaceable unit LSA logistic support analysis MART mean active repair time MTTR mean time to repair (or restoration or recovery) RCM reli
43、ability centred maintenance SSI software significant item 4 General approach An important portion of the cost of using an item is the total resources spent on those tasks necessary to retain an item in, or restore it to, a satisfactory condition. This total effort is related to the number of these t
44、asks, their complexity and duration. The design of an item shall ensure three things, namely: a) that it achieves the performance required of it; b) that it is reliable; c) that it is maintainable. The second and third of these characteristics directly affect the maintenance effort which shall be ex
45、pended on an item in that the achieved reliability reflects the frequency of unscheduled maintenance and the maintainability reflects the effort necessary to undertake all maintenance. 8 EN 60706-2:2006Therefore actions performed during the design of an item and intended to affect the failure rate a
46、nd the severity of the failures call mainly for reliability techniques, while those intended to affect the preventive and corrective maintenance and the duration, cost and support requirements of maintenance tasks call mainly for maintainability techniques. An item that can be maintained easily and
47、is supported by a competent and efficient maintenance organization has a greater availability and a reduced life cycle cost than one that does not have these attributes. The degree of effort that is put into achieving good maintainability and an efficient support organization depends on the type of
48、product and the use to which it is put, and is based on operational, economic and safety factors. During the design phase, components with wear out must be identified, and their life time be determined, for example, by using Weibull analysis (see IEC 61649). The trade-off between components with hig
49、her life time versus the cost of preventive or corrective maintenance should be documented. In this way the system can be designed for minimum maintenance. 5 Principle of maintainability This standard examines the maintainability and related design and use parameters and discusses some of the activities necessary to achieve the required maintainability character-istics and their relationship to the planning
