{"id":23166,"date":"2019-07-29T16:06:38","date_gmt":"2019-07-29T14:06:38","guid":{"rendered":"https:\/\/www.weyer-gruppe.com\/sil-safety-integrity-level\/"},"modified":"2026-03-19T14:56:20","modified_gmt":"2026-03-19T13:56:20","slug":"sil-safety-integrity-level","status":"publish","type":"page","link":"https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/","title":{"rendered":"SIL – Safety Integrity Level"},"content":{"rendered":"
[vc_row][vc_column][vc_column_text]\n

SIL – Verifications for safety systems in the process industry<\/h2>\n

For the proper technical implementation of safety systems (Safety instrumented Systems: SIS) in the process industry, verification of compliance with the requisite safety integrity level (SIL) needs to be documented as part of the safety lifecycle for safety functions. Safety functions (Safety instrumented Function: SIF) are determined and classified with a SIL in the hazard analysis and risk assessment<\/a>. The SIL implemented with the safety system for each safety function can be determined, which needs to be identical or better than the classified SIL. The engineers from the weyer group determine the SIL for a safety function from the circuit design and the reliability characteristics that the manufacturers provide for the safety-related components and check whether the classified SIL is complied with.[\/vc_column_text]

Services<\/span><\/h2>[vc_tta_accordion][vc_tta_section title=”Testing of the circuit structure to avoid systematic failures” tab_id=”1581494165615-95a58cf4-1626″][vc_column_text]The weyer group checks the SIL implemented based on the hardware fault tolerance (HFT) and safe failure fraction (SFF) of subsystems. The check results in a qualitative assessment of the protective circuit for a safety function. Depending on the requirement, improvements can be achieved through redundant design or suitable device selection or diversity.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”Testing for random failures” tab_id=”1581494165635-aca83c82-1081″][vc_column_text]Random hardware failures are assessed by calculating the mean probability of failure on demand (PFDavg) or mean probability of failure per hour (PFH). The reliability data from the manufacturers concerning the failure rate of the devices from the SIL declaration of conformity are used for this purpose.<\/p>\n

In order to demonstrate the SIL for a safety function, the sensor technology, logic and actuators subsystems in the safety-related functional chain (loop) are taken into consideration and summarised.<\/p>\n

By optimising the structural design through redundancy and\/or selecting suitable devices, the SIL implemented can be improved and test periods determined or extended.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”Assessment according to standards” tab_id=”1581494202196-72043403-f928″][vc_column_text]F\u00fcr die Beurteilung der steuerungstechnischen Sicherheitsfunktionen in einer Anlage bedienen sich die Ingenieure der weyer gruppe der Normenreihe DIN EN 61508<\/a>, DIN EN 61511<\/a> und VDI\/VDE 2180<\/a>, in denen die Anforderungen an sicherheitstechnische Funktionen in der Prozesstechnik, die mit Sicherheitssystemen umgesetzt werden, beschrieben sind. Somit kann der Anlagenbetreiber sicher sein, dass die aktuell g\u00fcltigen Sicherheitsstandards erf\u00fcllt werden.[\/vc_column_text][\/vc_tta_section][vc_tta_section title=”SIL project management” tab_id=”1581494215355-e127e158-5d78″][vc_column_text]Before designing the control technology, a HAZOP<\/a>and risk assessment determine the safety functions (SIF) and classifies the SIL required. The subsystems sensor(s), logic system and actuator(s) are assigned to the safety system (SIS) with the necessary instrumentation for each safety function as a loop. The engineers at the weyer group determine the architecture and fault tolerance of the safety system. Subsequently, suitable devices (sensors and actuators) and their operating conditions and the safety-related control (logic system) need to be specified (e.g. explosion protection). The device manufacturers need to supply their reliability data (HFT, SFF and failure rates) and the documentation for their devices. As soon as this data is complete, the interval for the recurring test can be determined. If necessary, alternative devices or redundant structures need be selected in order to improve the SIL or extend the test intervals. Test intervals for subsystems can be compared and used to determine a standard maintenance date.[\/vc_column_text][\/vc_tta_section][\/vc_tta_accordion][\/vc_column][\/vc_row][vc_row bg_type=”color” bg_color=”#0b3c80″ font_color=”#ffffff”][vc_column]

<\/div>[vc_row_inner][vc_column_inner width=”1\/2″][vc_column_text css=”.vc_custom_1659361335317{border-right-width: px !important;padding-right: 60px !important;}”]\n
\n
\n
weyer spezial: SIL – Bestimmungen f\u00fcr Sicherheitssysteme in der Prozessindustrie<\/h6>\n

F\u00fcr die fachgerechte Ausf\u00fchrung von Sicherheitssystemen (Safety instrumented System: SIS) in der Prozessindustrie ist ein Nachweis \u00fcber die Einhaltung des geforderten Sicherheitsintegrit\u00e4tslevels (SIL) im Rahmen des Sicherheitslebenszyklus zu dokumentieren. Bei der Gefahrenanalyse und Risikobeurteilung werden Sicherheitsfunktionen (Safety instrumented Function: SIF) ermittelt und mit einem geforderten SIL bewertet. F\u00fcr jede Sicherheitsfunktion, die mit einem Sicherheitssystem ausgef\u00fchrt wird, kann f\u00fcr systematische und zuf\u00e4llige Ausf\u00e4lle der erreichbare SIL bestimmt werden. \u2026<\/p>\n

Hier weyer spezial herunterladen<\/a><\/div>\n<\/div>\n[\/vc_column_text][\/vc_column_inner][vc_column_inner width=”1\/3″]

\"weyer<\/a><\/div>[\/vc_column_inner][\/vc_row_inner][vc_empty_space height=”60px”][\/vc_column][\/vc_row][vc_row][vc_column]
<\/div>[\/vc_column][\/vc_row][vc_row][vc_column]

Our Team<\/span><\/h3>[\/vc_column][\/vc_row][vc_row][vc_column width=”1\/4″]\r\n\t\t
\r\n\t\t\t
\r\n\t\t\t\t
\r\n\t\t\t\t\t\"Platzhalte\t\t\t\t<\/div>\r\n\t\t\t\t
\r\n\t\t\t\t\t
\r\n\t\t\t\t\t\t\t\t\t\t\t\t

Frank Kalz<\/h4>\r\n\t\t\t\t\t\t\t\t\t\t\t\thorst weyer und partner<\/small>\r\n\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t<\/figcaption>\r\n\t\t\t<\/figure>\r\n\t\t<\/div>\r\n\r\n\t\t[\/vc_column][\/vc_row]\n<\/div>","protected":false},"excerpt":{"rendered":"

[vc_row][vc_column][vc_column_text] SIL – Verifications for safety systems in the process industry For the proper technical implementation of safety systems (Safety instrumented Systems: SIS) in the process industry, verification of compliance with the requisite safety integrity level (SIL) needs to be documented as part of the safety lifecycle for safety functions. Safety functions (Safety instrumented Function: […]<\/p>\n","protected":false},"author":5,"featured_media":0,"parent":23837,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-23166","page","type-page","status-publish","hentry"],"yoast_head":"\nDetermination of the SIL - Safety Integrity Level – weyer gruppe<\/title>\n<meta name=\"description\" content=\"The weyer group determines the SIL based on the reliability data provided by the manufacturer of the safety-related components. Enquire today!\" \/>\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.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SIL - Safety Integrity Level\" \/>\n<meta property=\"og:description\" content=\"The weyer group determines the SIL based on the reliability data provided by the manufacturer of the safety-related components. Enquire today!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/\" \/>\n<meta property=\"og:site_name\" content=\"weyer gruppe\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/weyergruppe\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-19T13:56:20+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/\",\"url\":\"https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/\",\"name\":\"Determination of the SIL - Safety Integrity Level – weyer gruppe\",\"isPartOf\":{\"@id\":\"https:\/\/www.weyer-gruppe.com\/en\/#website\"},\"datePublished\":\"2019-07-29T14:06:38+00:00\",\"dateModified\":\"2026-03-19T13:56:20+00:00\",\"description\":\"The weyer group determines the SIL based on the reliability data provided by the manufacturer of the safety-related components. Enquire today!\",\"breadcrumb\":{\"@id\":\"https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"HOME\",\"item\":\"https:\/\/www.weyer-gruppe.com\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Plant operators and investors\",\"item\":\"https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"SIL – Safety Integrity Level\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.weyer-gruppe.com\/en\/#website\",\"url\":\"https:\/\/www.weyer-gruppe.com\/en\/\",\"name\":\"weyer gruppe\",\"description\":\"komplett. durchdacht.\",\"publisher\":{\"@id\":\"https:\/\/www.weyer-gruppe.com\/en\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.weyer-gruppe.com\/en\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.weyer-gruppe.com\/en\/#organization\",\"name\":\"weyer gruppe\",\"url\":\"https:\/\/www.weyer-gruppe.com\/en\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.weyer-gruppe.com\/en\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.weyer-gruppe.com\/wp-content\/uploads\/2019\/07\/logo-weyer-gruppe-de.png\",\"contentUrl\":\"https:\/\/www.weyer-gruppe.com\/wp-content\/uploads\/2019\/07\/logo-weyer-gruppe-de.png\",\"width\":532,\"height\":513,\"caption\":\"weyer gruppe\"},\"image\":{\"@id\":\"https:\/\/www.weyer-gruppe.com\/en\/#\/schema\/logo\/image\/\"},\"sameAs\":[\"https:\/\/www.facebook.com\/weyergruppe\",\"https:\/\/de.linkedin.com\/company\/weyer-gruppe\",\"https:\/\/www.youtube.com\/channel\/UCmZItECuW56Ih_p501_Bq8A\"],\"description\":\"Die weyer gruppe ist seit 1976 Ihr Partner f\u00fcr verfahrenstechnische Anlagenplanung und Anlagensicherheit. Mit einem erfahrenen Team von \u00fcber 190 Mitarbeitern in Deutschland, \u00d6sterreich, Polen und der Schweiz realisieren wir j\u00e4hrlich \u00fcber 1.000 Kundenprojekte. Unsere Expertise erstreckt sich \u00fcber verschiedene Branchen wie Chemie, Pharma, Mineral\u00f6l sowie Ver- und Entsorgung. Vertrauen Sie auf die weyer Gruppe f\u00fcr ma\u00dfgeschneiderte Engineering- und Consulting-L\u00f6sungen, die Ihre Anforderungen in puncto Sicherheit und Effizienz erf\u00fcllen.\",\"email\":\"info@weyer-gruppe.com\",\"telephone\":\"+49 (0) 24 21 \u2013 69 09 1 \u2013 0\",\"numberOfEmployees\":{\"@type\":\"QuantitativeValue\",\"minValue\":\"51\",\"maxValue\":\"200\"}}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Determination of the SIL - Safety Integrity Level – weyer gruppe","description":"The weyer group determines the SIL based on the reliability data provided by the manufacturer of the safety-related components. Enquire today!","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.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/","og_locale":"en_US","og_type":"article","og_title":"SIL - Safety Integrity Level","og_description":"The weyer group determines the SIL based on the reliability data provided by the manufacturer of the safety-related components. Enquire today!","og_url":"https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/","og_site_name":"weyer gruppe","article_publisher":"https:\/\/www.facebook.com\/weyergruppe","article_modified_time":"2026-03-19T13:56:20+00:00","twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/","url":"https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/","name":"Determination of the SIL - Safety Integrity Level – weyer gruppe","isPartOf":{"@id":"https:\/\/www.weyer-gruppe.com\/en\/#website"},"datePublished":"2019-07-29T14:06:38+00:00","dateModified":"2026-03-19T13:56:20+00:00","description":"The weyer group determines the SIL based on the reliability data provided by the manufacturer of the safety-related components. Enquire today!","breadcrumb":{"@id":"https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/sil-safety-integrity-level\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"HOME","item":"https:\/\/www.weyer-gruppe.com\/en\/"},{"@type":"ListItem","position":2,"name":"Plant operators and investors","item":"https:\/\/www.weyer-gruppe.com\/en\/plant-operators-and-investors\/"},{"@type":"ListItem","position":3,"name":"SIL – Safety Integrity Level"}]},{"@type":"WebSite","@id":"https:\/\/www.weyer-gruppe.com\/en\/#website","url":"https:\/\/www.weyer-gruppe.com\/en\/","name":"weyer gruppe","description":"komplett. durchdacht.","publisher":{"@id":"https:\/\/www.weyer-gruppe.com\/en\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.weyer-gruppe.com\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.weyer-gruppe.com\/en\/#organization","name":"weyer gruppe","url":"https:\/\/www.weyer-gruppe.com\/en\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.weyer-gruppe.com\/en\/#\/schema\/logo\/image\/","url":"https:\/\/www.weyer-gruppe.com\/wp-content\/uploads\/2019\/07\/logo-weyer-gruppe-de.png","contentUrl":"https:\/\/www.weyer-gruppe.com\/wp-content\/uploads\/2019\/07\/logo-weyer-gruppe-de.png","width":532,"height":513,"caption":"weyer gruppe"},"image":{"@id":"https:\/\/www.weyer-gruppe.com\/en\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/weyergruppe","https:\/\/de.linkedin.com\/company\/weyer-gruppe","https:\/\/www.youtube.com\/channel\/UCmZItECuW56Ih_p501_Bq8A"],"description":"Die weyer gruppe ist seit 1976 Ihr Partner f\u00fcr verfahrenstechnische Anlagenplanung und Anlagensicherheit. Mit einem erfahrenen Team von \u00fcber 190 Mitarbeitern in Deutschland, \u00d6sterreich, Polen und der Schweiz realisieren wir j\u00e4hrlich \u00fcber 1.000 Kundenprojekte. Unsere Expertise erstreckt sich \u00fcber verschiedene Branchen wie Chemie, Pharma, Mineral\u00f6l sowie Ver- und Entsorgung. Vertrauen Sie auf die weyer Gruppe f\u00fcr ma\u00dfgeschneiderte Engineering- und Consulting-L\u00f6sungen, die Ihre Anforderungen in puncto Sicherheit und Effizienz erf\u00fcllen.","email":"info@weyer-gruppe.com","telephone":"+49 (0) 24 21 \u2013 69 09 1 \u2013 0","numberOfEmployees":{"@type":"QuantitativeValue","minValue":"51","maxValue":"200"}}]}},"_links":{"self":[{"href":"https:\/\/www.weyer-gruppe.com\/en\/wp-json\/wp\/v2\/pages\/23166","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.weyer-gruppe.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.weyer-gruppe.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.weyer-gruppe.com\/en\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.weyer-gruppe.com\/en\/wp-json\/wp\/v2\/comments?post=23166"}],"version-history":[{"count":1,"href":"https:\/\/www.weyer-gruppe.com\/en\/wp-json\/wp\/v2\/pages\/23166\/revisions"}],"predecessor-version":[{"id":237888,"href":"https:\/\/www.weyer-gruppe.com\/en\/wp-json\/wp\/v2\/pages\/23166\/revisions\/237888"}],"up":[{"embeddable":true,"href":"https:\/\/www.weyer-gruppe.com\/en\/wp-json\/wp\/v2\/pages\/23837"}],"wp:attachment":[{"href":"https:\/\/www.weyer-gruppe.com\/en\/wp-json\/wp\/v2\/media?parent=23166"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}