IEC IEC61511-3 Edition2.02016-07 INTERNATIONAL STANDARD NORME INTERNATIONALE colour nside Functional safety-Safety instrumented systemsfortheprocess industry sector- Part 3:Guidance for the determination of the required safety integrity levels Securitefonctionnelle-Systemes instrumentesdesecuritepourlesecteurdes industriesdetransformation Partie3:Conseils pourla determinationdes niveaux exigés d'integrite de sécurite IEC 61511-3:2016-07(en-fr) THISPUBLICATIONISCOPYRIGHTPROTECTED Copyright@2016IEC,Geneva,Switzerland or by anymeans,electronic ormechanical, including photocopying and microfilm,without permission in writing from either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Commitee for further information. ni utilisee sous quelque forme que ce soit et par aucun procede, electronique ou mecanique, y compris la photocopie et les microfilms, sans I'accord ecrit de I'IEC ou du Comite national de I'IEC du pays du demandeur. Si vous avez des questions sur le copyright de I'lEC ou si vous desirez obtenir des droits supplementaires sur cette publication, utilisez les coordonnees ci-apres ou contactez le Comite national de IlEC de votre pays de residence. IEC Central Office Tel.: +41 22 919 02 11 3, rue de Varembe Fax: +4122919 03 00 CH-1211Geneva 20 [email protected] Switzerland www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standardsforall electrical, electronic and related technologies. AboutIECpublications latest edition, a corrigenda or an amendment might have been published. IEC Catalogue-webstore.iec.ch/catalogue Electropedia-www.electropedia.org Thestand-alone application forconsulting the entire The world's leading online dictionary of electronic and bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in Technical Specifications, Technical Reports. andother English and French,with equivalent terms in 15 additional documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnica iPad. Vocabulary (IEV)online. IEcpublicationssearch-www.iec.ch/searchpub IEcGlossary-std.iec.ch/glossary TheadvancedsearchenablestofindIECpublicationsbya 65 000 electrotechnical terminology entries in English and varietyof criteria(referencenumber, text, technical French extracted from the Terms and Definitions clause of committee,..). It also gives information on projects, replaced iEC publications issued since 2002. Some entries have been and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and CISPR. IE JustPublished-webstore.iec.ch/justpublished StayuptodateonallnewIECpublications.JustPublished IEcCustomerServiceCentre-webstore.iec.ch/csc details all new publications released. Available online and If you wish to give us your feedback on this publication or also once a month by email. needfurtherassistance,pleasecontactthe Customer Service Centre:[email protected]. A propos de I'IEc La Commission Electrotechnique Internationale (IEC)est la premiere organisation mondiale qui élabore et publie des Normes internationales pour tout ce qui a trait a I'electricite, a I'electronique et aux technologies apparentees. Aproposdes publications IEC Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possedez I'édition la plus recente,un corrigendum ou amendementpeutavoir éte publie. CataloguelEc-webstore.iec.ch/catalogue Electropedia -www.electropedia.org Applicationautonomepourconsultertouslesrenseignements Le premier dictionnaire en ligne de termes électroniques et bibliographiques sur les Normes internationales, electriques.Il contient 20 000 termes et definitions en a