{"id":3829,"date":"2023-01-04T17:56:52","date_gmt":"2023-01-04T16:56:52","guid":{"rendered":"https:\/\/www.gt-engineering.it\/normative-tecniche\/%tipologia_normativa%\/protections-layers-iec-61511\/"},"modified":"2023-06-26T14:13:13","modified_gmt":"2023-06-26T13:13:13","slug":"protections-layers-iec-61511","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iec-standards\/iec-61511-gt-engineering\/protections-layers-iec-61511\/","title":{"rendered":"The concept of Protection Layers"},"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\/protection-levels-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=\"280\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/protection-levels-300x280.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 768px)\"\r\n                                width=\"768\"\r\n                                height=\"717\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/protection-levels-768x717.jpg.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 1024px)\"\r\n                                width=\"1024\"\r\n                                height=\"956\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/01\/protection-levels-1024x956.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\/protection-levels.jpg.webp\"\r\n                                                        title=\"protection levels\"\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 style=\"margin: 0cm 0cm 8pt; text-align: justify;\"><span align=\"left\" style=\"margin:0cm 0cm 8pt;text-align:left;\">An intuitive way of representing the risk reduction capability of a Safety Instrumented System is to use the concept of <strong>Protection layer <\/strong>as described in IEC 61511-1. <\/span><\/p>\n<blockquote>\n<p style=\"text-align: justify;\"><strong><span align=\"left\" style=\"margin:0cm 0cm 8pt;text-align:left;\">[IEC 61511-1] 3.2 Terms and definitions &#8211; 3.2.57 Protection Layer: any independent mechanism that reduces risk by control, prevention or mitigation.<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\"><span align=\"left\" style=\"margin:0cm 0cm 8pt;text-align:left;\"><strong>Note 1 to entry<\/strong>: It can be a process engineering mechanism such as the size of vessels containing hazardous chemicals, a mechanical mechanism such as a relief valve, a SIS or an administrative procedure such as an emergency plan against an imminent hazard. These responses may be automated or initiated by human actions (see Figure).<\/span><\/p>\n<\/blockquote>\n<p style=\"text-align: justify;\"><span align=\"left\" style=\"margin:0cm 0cm 8pt;text-align:left;\">In a typical chemical process, various <strong>protection layers,<\/strong> like shown in the drawing at the side,&nbsp;are in place to lower the frequency of undesired consequences: the process design (including inherently safer concepts); the basic process control system (<strong>BPCS<\/strong>); safety instrumented systems (<strong>SIS<\/strong>); active devices (such as <strong>relief valves<\/strong>); passive devices (such as dikes and blast walls); human intervention; etc.&nbsp;<\/span><\/p>\n<p style=\"text-align: justify;\"><span align=\"left\" style=\"margin:0cm 0cm 8pt;text-align:left;\">Protection layers that perform their function with a high degree of reliability may qualify as independent protection layers (IPL).&nbsp;<\/span><\/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>An intuitive way of representing the risk reduction capability of a Safety Instrumented System is to use the concept of Protection layer as described in IEC 615&#8230;<\/p>\n","protected":false},"author":1,"featured_media":3559,"parent":3796,"menu_order":3,"template":"","meta":{"_acf_changed":false,"footnotes":""},"normative-tecniche":[58],"class_list":["post-3829","normativa_tecnica","type-normativa_tecnica","status-publish","has-post-thumbnail","hentry","tipologia_normativa-en-iec-standards"],"acf":{"sottotitolo":"","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The concept of Protection Layers<\/title>\n<meta name=\"description\" content=\"An intuitive way of representing the risk reduction capability of a Safety 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