{"id":3292,"date":"2023-01-04T16:23:24","date_gmt":"2023-01-04T15:23:24","guid":{"rendered":"https:\/\/www.gt-engineering.it\/normative-tecniche\/%tipologia_normativa%\/iso-13577-4-forni-gt-engineering\/"},"modified":"2026-01-03T12:47:56","modified_gmt":"2026-01-03T11:47:56","slug":"iso-13577-4-forni-gt-engineering","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/","title":{"rendered":"EN ISO 13577-4 – Industrial Furnaces – Protective Systems"},"content":{"rendered":"\n\n \n \n \n
\n\n \n \n \n \r\n\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n <\/picture>\r\n\r\n \r\n\r\n \r\n \r\n <\/div>\n \n
\n \n
\n

EN ISO 13577 <\/strong>is the series of standards, at international level, that give prescriptions on how to design a safe Industrial Furnace<\/strong>. <\/span><\/p>\n

In Europe, since the late 1990s, the\u00a0EN 746 series<\/strong>\u00a0served as the primary reference for the safety of industrial furnaces. The latest edition of\u00a0EN ISO 13577-4<\/strong>\u00a0was published in July 2022. GT Engineering actively participated in its development, making a significant contribution to the\u00a0Functional Safety<\/strong>\u00a0section.<\/p>\n

The new edition of\u00a0EN ISO 13577-2<\/strong>\u00a0followed in 2023. By June 2024, all national editions of\u00a0EN 746-2<\/strong>\u00a0(including those of Italy, the UK, France, Spain, and others) were officially withdrawn. As a result,\u00a0EN ISO 13577-2<\/strong>\u00a0and\u00a0EN ISO 13577-4<\/strong>\u00a0are now the sole reference standards for the safe design of industrial furnaces in Europe.<\/p>\n

EN ISO 13577 consists of the following parts, under the general title Industrial furnaces and associated processing equipment \u2014 Safety:<\/span><\/span><\/p>\n

    \n
  • Part 1: General requirements<\/span><\/span><\/strong><\/li>\n
  • Part 2: Combustion and fuel handling systems<\/span><\/span><\/strong><\/li>\n
  • Part 3: Generation and use of protective and reactive atmosphere gases<\/span><\/span><\/strong><\/li>\n
  • Part 4: Protective systems<\/span><\/span><\/strong><\/li>\n<\/ul>\n

    The acronym used in the standard to indicate industrial furnaces and associated processing equipment was IThE (EN 746-2) and it is now TPE. <\/span><\/span><\/p>\n

    What are the main changes compared to the 2014 edition of EN ISO 13577-4?<\/span><\/span><\/strong><\/p>\n

      \n
    • It was made clear that the EN<\/strong> ISO 13577 series is not applicable to Petrochemical furnaces<\/strong>. EN 7462 mentions, as examples of IThE (Annex A), several types of furnaces in the chemical\/petrochemical industry. In the new edition of EN ISO 13577-2 it is stated: <\/span><\/span><\/li>\n<\/ul>\n

      [EN ISO 13577-4: 2022] 1 Scope<\/span><\/span><\/strong><\/p>\n

      [\u2026] This document is not applicable to blast furnaces, converters (in steel plants), boilers, fired heaters (including reformer furnaces) in the petrochemical and chemical industries.<\/span><\/span><\/p><\/blockquote>\n

      – EN 746-2<\/strong> allows the use of instrumentation, non SIL certified<\/strong>, to take case of the furnace Safety. That is detailed in chapter 5.7 of EN 746-2<\/strong> and it is derived from Method A of EN ISO 13577-4<\/strong>. The approach is kept in Iso 13577-4: 2022 edition, as well. In case some of the components, SIL certified, are used for the Furnace Safety, that is known as \u201cMethod B\u201d or Method \u201cC\u201d<\/strong>. Since the differences between the two method were small, in the new edition of EN ISO 13577-4, Method B and Method C were combined in one called Method BC<\/strong>. That approach is used every time either the input subsystem, or the logic or the output subsystems are SIL certified. <\/span><\/span><\/p>\n

      The principles of the three methods (A, BC, or D) are hereafter summarised:<\/span><\/span><\/p>\n

      – Method A:<\/strong> wired system, all devices comply with relevant product standards; SIL- \/ PL-calculation is not required;<\/span><\/span><\/p>\n

      – Method BC:<\/strong> combination of devices meeting relevant product standards with devices for which no relevant product standard exits. SIL- \/ PL-calculation for the subsystems with no product standard is required;<\/span><\/span><\/p>\n

      – Method D:<\/strong> full requirement in accordance with the IEC 61508:2010 series, the IEC 61511:2016 series, IEC 62061:2021, or ISO 13849-1. \u00a0SIL \/ PL calculation is mandatory for each safety function.<\/span><\/span><\/p>\n

       <\/p>\n<\/div> <\/div>\n \n \n

      <\/div>\n \n\n <\/div>\n <\/section>\n\n \n\n\n\n\n \n \n \n
      \n\n \n \n \n \r\n\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n <\/picture>\r\n\r\n \r\n\r\n \r\n \r\n <\/div>\n \n
      \n \n
      \n

      – Here is now a better<\/strong> alignment <\/strong>with ISO 13849-1 and IEC 62061<\/strong>. Therefore, Annex E has been significantly modified to reflect the approach by Subsystems and Subfunctions<\/strong>, now widely established in both ISO 13849-1 and IEC 62061. The first part of Annex E shows several examples of how to implement an input subsystem with either Method A or Method BC. The same approach is shown for the Logic and for the Output Subsystem.
      \nOn that basis, the examples present in the 2014 edition of EN ISO 13577-4 were redrawn and may were made new, highlighting the new approach by subfunctions.<\/strong><\/p>\n

      –\u00a0Annex B and Annex F<\/strong> were merged and a clearer language with better examples are now present in the revised Annex.
      \nThe Annex makes it clear that the furnace electrical installation must comply with IEC 60204-1:2016<\/strong>. It describes how to wire the protective system so as not to reduce the level of safety and it applies to the wiring within the logic solver, and the wiring between the logic solver and the devices that directly or indirectly control the final elements. Moreover, it applies to the field wiring like sensors, interlocks, actuators, final elements, flame detector, igniter, etc.<\/strong>
      \nTo maintain the level of safety of the wired protective system, techniques shall be applied to avoid or prevent the introduction of systematic faults during design <\/strong>and development and to apply design features (e.g. selfchecking, redundancy) to control both random and systematic faults during operation.
      \nPicture hereafter shows how to connect two pressure switches to the control panel.<\/span><\/p>\n

       <\/p>\n<\/div> <\/div>\n \n \n

      <\/div>\n \n\n <\/div>\n <\/section>\n\n \n\n\n\n\n \n \n \n
      \n\n \n \n \n \r\n\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n <\/picture>\r\n\r\n \r\n\r\n \r\n \r\n <\/div>\n \n
      \n \n
      \n

       <\/p>\n<\/div> <\/div>\n \n \n

      <\/div>\n \n\n <\/div>\n <\/section>\n\n \n","protected":false},"excerpt":{"rendered":"

      ISO 13577 is the series of standards, at international level, that give prescriptions on how to design a safe Industrial Furnace. <\/p>\n

      In Europe, so far, we follow…<\/p>\n","protected":false},"author":1,"featured_media":3293,"parent":0,"menu_order":6,"template":"","meta":{"_acf_changed":false,"footnotes":""},"normative-tecniche":[57],"class_list":["post-3292","normativa_tecnica","type-normativa_tecnica","status-publish","has-post-thumbnail","hentry","tipologia_normativa-en-iso-standards"],"acf":{"sottotitolo":"","allegati":null},"yoast_head":"\nISO 13577-4. INDUSTRIAL FURNACES - Protective Systems<\/title>\n<meta name=\"description\" content=\"ISO 13577 is the series of standards, at international level, that give prescriptions on how to design a safe Industrial Furnace. In Europe, so far, we follow...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ISO 13577-4. INDUSTRIAL FURNACES - Protective Systems\" \/>\n<meta property=\"og:description\" content=\"ISO 13577 is the series of standards, at international level, that give prescriptions on how to design a safe Industrial Furnace. In Europe, so far, we follow...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/\" \/>\n<meta property=\"og:site_name\" content=\"Gt-Engineering\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-03T11:47:56+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/kkkkkkkkkkkkkkkkkkkkkk.jpg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"ISO 13577-4. INDUSTRIAL FURNACES - Protective Systems\" \/>\n<meta name=\"twitter:description\" content=\"ISO 13577 is the series of standards, at international level, that give prescriptions on how to design a safe Industrial Furnace. In Europe, so far, we follow...\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/kkkkkkkkkkkkkkkkkkkkkk.jpg\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/\",\"url\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/\",\"name\":\"ISO 13577-4. INDUSTRIAL FURNACES - Protective Systems\",\"isPartOf\":{\"@id\":\"https:\/\/www.gt-engineering.it\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/llllllllllllllllllllllllll.jpg\",\"datePublished\":\"2023-01-04T15:23:24+00:00\",\"dateModified\":\"2026-01-03T11:47:56+00:00\",\"description\":\"ISO 13577 is the series of standards, at international level, that give prescriptions on how to design a safe Industrial Furnace. In Europe, so far, we follow...\",\"breadcrumb\":{\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/#primaryimage\",\"url\":\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/llllllllllllllllllllllllll.jpg\",\"contentUrl\":\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/llllllllllllllllllllllllll.jpg\",\"width\":525,\"height\":406,\"caption\":\"ISO 13577-4. INDUSTRIAL FURNACES - Protective Systems\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.gt-engineering.it\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Technical standards\",\"item\":\"https:\/\/www.gt-engineering.it\/en\/normative-tecniche\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Harmonised European Standards\",\"item\":\"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"EN ISO 13577-4 – Industrial Furnaces – Protective Systems\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.gt-engineering.it\/en\/#website\",\"url\":\"https:\/\/www.gt-engineering.it\/en\/\",\"name\":\"Gt-Engineering\",\"description\":\"bizonweb\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.gt-engineering.it\/en\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"ISO 13577-4. INDUSTRIAL FURNACES - Protective Systems","description":"ISO 13577 is the series of standards, at international level, that give prescriptions on how to design a safe Industrial Furnace. In Europe, so far, we follow...","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/","og_locale":"en_US","og_type":"article","og_title":"ISO 13577-4. INDUSTRIAL FURNACES - Protective Systems","og_description":"ISO 13577 is the series of standards, at international level, that give prescriptions on how to design a safe Industrial Furnace. In Europe, so far, we follow...","og_url":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/","og_site_name":"Gt-Engineering","article_modified_time":"2026-01-03T11:47:56+00:00","og_image":[{"url":"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/kkkkkkkkkkkkkkkkkkkkkk.jpg","type":"","width":"","height":""}],"twitter_card":"summary_large_image","twitter_title":"ISO 13577-4. INDUSTRIAL FURNACES - Protective Systems","twitter_description":"ISO 13577 is the series of standards, at international level, that give prescriptions on how to design a safe Industrial Furnace. In Europe, so far, we follow...","twitter_image":"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/kkkkkkkkkkkkkkkkkkkkkk.jpg","twitter_misc":{"Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/","url":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/","name":"ISO 13577-4. INDUSTRIAL FURNACES - Protective Systems","isPartOf":{"@id":"https:\/\/www.gt-engineering.it\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/#primaryimage"},"image":{"@id":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/#primaryimage"},"thumbnailUrl":"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/llllllllllllllllllllllllll.jpg","datePublished":"2023-01-04T15:23:24+00:00","dateModified":"2026-01-03T11:47:56+00:00","description":"ISO 13577 is the series of standards, at international level, that give prescriptions on how to design a safe Industrial Furnace. In Europe, so far, we follow...","breadcrumb":{"@id":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/#primaryimage","url":"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/llllllllllllllllllllllllll.jpg","contentUrl":"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/llllllllllllllllllllllllll.jpg","width":525,"height":406,"caption":"ISO 13577-4. INDUSTRIAL FURNACES - Protective Systems"},{"@type":"BreadcrumbList","@id":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/iso-13577-4-forni-gt-engineering\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.gt-engineering.it\/en\/"},{"@type":"ListItem","position":2,"name":"Technical standards","item":"https:\/\/www.gt-engineering.it\/en\/normative-tecniche\/"},{"@type":"ListItem","position":3,"name":"Harmonised European Standards","item":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/"},{"@type":"ListItem","position":4,"name":"EN ISO 13577-4 – Industrial Furnaces – Protective Systems"}]},{"@type":"WebSite","@id":"https:\/\/www.gt-engineering.it\/en\/#website","url":"https:\/\/www.gt-engineering.it\/en\/","name":"Gt-Engineering","description":"bizonweb","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.gt-engineering.it\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/normativa_tecnica\/3292","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/normativa_tecnica"}],"about":[{"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/types\/normativa_tecnica"}],"author":[{"embeddable":true,"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":24,"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/normativa_tecnica\/3292\/revisions"}],"predecessor-version":[{"id":50708,"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/normativa_tecnica\/3292\/revisions\/50708"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/media\/3293"}],"wp:attachment":[{"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/media?parent=3292"}],"wp:term":[{"taxonomy":"tipologia_normativa","embeddable":true,"href":"https:\/\/www.gt-engineering.it\/en\/wp-json\/wp\/v2\/normative-tecniche?post=3292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}