BS-EN-61511-3-2004.pdf
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1、BRITISH STANDARD BS EN 61511-3:2004 Incorporating Amendment No. 1 to BS IEC 61511-3:2003 (renumbers the BS IEC as BS EN 61511-3:2004) Functional safety Safety instrumented systems for the process industry sector Part 3: Guidance for the determination of the required safety integrity levels The Europ
2、ean Standard EN 61511-3:2004 has the status of a British Standard ICS 25.040.01 ? Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 01:35:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61511-3:2004 This British Standard was published under the authority of the Standards Policy and Strategy
3、 Committee on 30 April 2003 BSI 16 May 2005 ISBN 0 580 41752 2 National foreword This British Standard is the official English language version of EN 61511-3:2004. It was derived by CENELEC from IEC 61511-3:2003, including Corrigendum October 2004. The UK participation in its preparation was entrust
4、ed by Technical Committee GEL/65, Measurement and control, to Subcommittee GEL/65/1, Systems considerations, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement i
5、nternational or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not
6、purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European comm
7、ittee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to
8、52, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 1557816 May 2005Implementation of the European Standard Licensed Copy: sheffieldun sheffieldun, na, Th
9、u Nov 09 01:35:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 61511-3 NORME EUROPENNE EUROPISCHE NORM December 2004 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Cen
10、tral Secretariat: rue de Stassart 35, B - 1050 Brussels 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61511-3:2004 E ICS 25.040.01 English version Functional safety Safety instrumented systems for the process industry secto
11、r Part 3: Guidance for the determination of the required safety integrity levels (IEC 61511-3:2003 + corrigendum 2004) Scurit fonctionnelle Systmes instruments de scurit pour le secteur des industries de transformation Partie 3: Conseils pour la dtermination des niveaux dintgrit de scurit (CEI 61511
12、-3:2003) Funktionale Sicherheit - Sicherheitstechnische Systeme fr die Prozessindustrie Teil 3: Anleitung fr die Bestimmung der erforderlichen Sicherheits- Integrittslevel (IEC 61511-3:2003 + Corrigendum 2004) This European Standard was approved by CENELEC on 2004-10-01. CENELEC members are bound to
13、 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 Centra
14、l 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 stat
15、us as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Sl
16、ovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 01:35:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Foreword The text of the International Standard IEC 61511-3:2003, prepared by SC 65A, System aspects, of IEC TC 65, Industrial-p
17、rocess measurement and control, was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 61511-3 on 2004-10-01 without any modification. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical nation
18、al standard or by endorsement (dop) 2005-10-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2007-10-01 _ Endorsement notice The text of the International Standard IEC 61511-3:2003 + corrigendum October 2004 was approved by CENELEC as a European Stand
19、ard without any modification. _ Page 2 EN 615113:2004 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 01:35:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CONTENTS INTRODUCTION. 5 1 Scope . 8 2 Terms, definitions and abbreviations9 3 Risk and safety integrity general guidance9 3.1 General 9 3.
20、2 Necessary risk reduction10 3.3 Role of safety instrumented systems .10 3.4 Safety integrity 10 3.5 Risk and safety integrity 12 3.6 Allocation of safety requirements.13 3.7 Safety integrity levels 13 3.8 Selection of the method for determining the required safety integrity level.14 Annex A (inform
21、ative) As Low As Reasonably Practicable (ALARP) and tolerable risk concepts.15 Annex B (informative) Semi-quantitative method 18 Annex C (informative) The safety layer matrix method26 Annex D (informative) Determination of the required safety integrity levels a semi- qualitative method: calibrated r
22、isk graph .32 Annex E (informative) Determination of the required safety integrity levels a qualitative method: risk graph.40 Annex F (informative) Layer of protection analysis (LOPA).45 Figure 1 Overall framework of this standard . 7 Figure 2 Typical risk reduction methods found in process plants .
23、9 Figure 3 Risk reduction: general concepts12 Figure 4 Risk and safety integrity concepts 12 Figure 5 Allocation of safety requirements to the Safety Instrumented Systems, non-SIS prevention/mitigation protection layers and other protection layers 13 Figure A.1 Tolerable risk and ALARP .16 Figure B.
24、1 Pressurized Vessel with Existing Safety Systems19 Figure B.2 Fault Tree for Overpressure of the Vessel.22 Figure B.3 Hazardous Events with Existing Safety Systems .23 Figure B.4 Hazardous Events with Redundant Protection Layer .24 Figure B.5 Hazardous Events with SIL 2 SIS Safety Function.25 Figur
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