{"id":36401,"date":"2023-01-04T17:57:02","date_gmt":"2023-01-04T16:57:02","guid":{"rendered":"https:\/\/www.gt-engineering.it\/?post_type=normativa_tecnica&#038;p=36401"},"modified":"2023-06-26T12:25:54","modified_gmt":"2023-06-26T11:25:54","slug":"methodes-pour-determiner-le-nombre-de-hft-necessaires","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/fr\/reglements-techniques\/normes-iec\/iec-61511-systemes-instrumentes-de-securite-pour-lindustrie-de-transformation\/methodes-pour-determiner-le-nombre-de-hft-necessaires\/","title":{"rendered":"M\u00e9thodes pour d\u00e9terminer le nombre de HFT n\u00e9cessaires"},"content":{"rendered":"\n\n    \n        <section\n            data-name=\"Contenuto testuale con immagine\"\n            class=\"bow-gte-testo-media u-spacer-base\"\n            id=\"\"\n        >\n            \n<div class=\"o-text-media px-side-spacer sm:px-side-spacer-sm lg:px-side-spacer-tablet 2xl:px-side-spacer-desktop flex flex-wrap items-start md:block\">\n\n    \n        \n                    <div\n                class=\"h-auto mb-6 md:mb-4 lg:mb-8 xl:mb-9 float-left mr-6 md:mr-4 lg:mr-8 xl:mr-9  overflow-hidden shadow-content-image w-full md:w-1\/3\"\n            >\n                \r\n\r\n    \r\n        \r\n            \r\n                \r\n                    <picture\r\n                        class=\"\"\r\n                                            >\r\n                                                                                                        <source\r\n                                media=\"(max-width: 150px)\"\r\n                                width=\"150\"\r\n                                height=\"150\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Route-1H-and-2H-150x150.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 300px)\"\r\n                                width=\"300\"\r\n                                height=\"254\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Route-1H-and-2H-300x254.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 600px)\"\r\n                                width=\"600\"\r\n                                height=\"507\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Route-1H-and-2H.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 600px)\"\r\n                                width=\"600\"\r\n                                height=\"507\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Route-1H-and-2H.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                            <img\r\n                            class=\"a-image transparent border-image h-auto  w-full\"\r\n                                                        srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/Route-1H-and-2H.jpg.webp\"\r\n                                                        title=\"Route 1H and 2H\"\r\n                                                        type=\"image\/webp\"\r\n                        \/>\r\n                    <\/picture>\r\n\r\n                \r\n\r\n                    \r\n    \r\n            <\/div>\n        \n                    <div class=\"relative w-full\">\n                \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p>La deuxi\u00e8me \u00e9dition pr\u00e9voit trois m\u00e9thodes <strong>diff\u00e9rentes pour d\u00e9terminer le HFT requis<\/strong> d&rsquo;un syst\u00e8me instrument\u00e9 de s\u00e9curit\u00e9 :<\/p>\n<ol>\n<li>La voie 1H de la IEC 61508-2, bas\u00e9e sur l&rsquo;analyse AMDED et la conformit\u00e9 avec les clauses correspondantes de la IEC 61508-2.<\/li>\n<li>Utilisation du concept d<strong>&lsquo;utilisation pr\u00e9alable<\/strong>. Cela signifie l&rsquo;utilisation du tableau 6 de la CEI 61511-1, en conjonction avec les exigences des clauses 11.5 \u00e0 11.9 de la IEC 61511-1.<\/li>\n<li><strong>La route 2H<\/strong> de la IEC 61508-2, bas\u00e9 sur les retours de produits au fabricant et la conformit\u00e9 avec les clauses correspondantes de la IEC 61508-2.<\/li>\n<\/ol>\n<p>Le tableau pr\u00e9cise que, dans le cas o\u00f9 un<strong> SIL 1<\/strong> doit \u00eatre atteint, <strong>aucune redondance n&rsquo;est n\u00e9cessaire<\/strong> ; il en va de m\u00eame dans le cas d&rsquo;un <strong>SIL 2 en mode de faible demande<\/strong>. Toutefois, si le syst\u00e8me fonctionne en<strong> mode \u00ab\u00a0forte demande\u00a0\u00bb<\/strong>, <strong>un HFT=1 est n\u00e9cessaire pour atteindre le niveau SIL 2.<\/strong><\/p>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n","protected":false},"excerpt":{"rendered":"<p>La deuxi\u00e8me \u00e9dition pr\u00e9voit trois m\u00e9thodes diff\u00e9rentes pour d\u00e9terminer le HFT requis d&rsquo;un syst\u00e8me instrument\u00e9 de s\u00e9curit\u00e9 :<\/p>\n","protected":false},"author":182,"featured_media":36394,"parent":36330,"menu_order":2,"template":"","meta":{"_acf_changed":false,"footnotes":""},"normative-tecniche":[165],"class_list":["post-36401","normativa_tecnica","type-normativa_tecnica","status-publish","has-post-thumbnail","hentry","tipologia_normativa-normes-iec"],"acf":{"sottotitolo":"","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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