{"id":3880,"date":"2021-06-10T15:15:22","date_gmt":"2021-06-10T14:15:22","guid":{"rendered":"https:\/\/safetyandsis.com\/arquitecturas-complejas-en-el-elemento-final-i\/"},"modified":"2025-08-04T17:43:33","modified_gmt":"2025-08-04T16:43:33","slug":"arquitecturas-complejas-en-el-elemento-final-i","status":"publish","type":"post","link":"https:\/\/safetyandsis.com\/es\/arquitecturas-complejas-en-el-elemento-final-i\/","title":{"rendered":"Arquitecturas complejas en el elemento final (I)"},"content":{"rendered":"
<\/p>\n

Arquitecturas complejas en el elemento final (I)<\/h2>\n<\/p>\n

Calcular la probabilidad de fallo (PFDavg) en una arquitectura compleja no suele ser sencillo, principalmente si no conocemos bien los conceptos. Veamos en este caso una arquitectura compleja en el elemento final.<\/p>\n<\/p>\n

Ejemplo: <\/strong>L\u00f3gica 4oo4 en el elemento final<\/p>\n<\/p>\n

Nos encontramos de vez en cuando Funciones Instrumentadas de Seguridad (SIF) en las que hay que cerrar varios flujos, y que adem\u00e1s utilizan tipos de v\u00e1lvulas y\/o actuadores diferentes.<\/p>\n<\/p>\n

\"\"<\/figure>\n<\/p>\n

\u00bfC\u00f3mo calculamos la probabilidad de fallo del subsistema actuador?<\/strong><\/p>\n<\/p>\n

4oo4 significa que para que la SIF <\/a>act\u00fae correctamente necesitamos que cierre los 4 flujos, es decir, debemos sumar las 4 probabilidades de fallo para obtener la PFDavg del elemento final. El problema es que la PFDavg total puede ser demasiado alta y no cumplir el SIL que necesitamos, aunque s\u00ed lo cumpla cada ramal de la 4oo4.<\/p>\n<\/p>\n

En la tabla siguiente vemos en el \u201cDesign 1\u201d el resultado con SILcet<\/a>:<\/p>\n<\/div>\r\n

\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Final Element<\/strong><\/th>\r\nDesign 1<\/strong><\/th>\r\nDesign 2<\/strong><\/th>\r\n<\/tr>\r\n<\/thead>\r\n
F.E. Architecture<\/td>\r\n4oo4 (1oo2\/1oo2\/1oo2\/1oo1<\/strong>)<\/td>\r\n4oo4 (1oo2\/1oo2\/1oo2\/1oo2<\/strong>)<\/td>\r\n<\/tr>\r\n
Achieved SIL<\/td>\r\nSIL-1<\/td>\r\nSIL-2<\/td>\r\n<\/tr>\r\n
PFDavg<\/td>\r\n2.10E-02<\/td>\r\n4.96E-03<\/td>\r\n<\/tr>\r\n
RRF<\/td>\r\n48<\/td>\r\n202<\/td>\r\n<\/tr>\r\n
MTTFS<\/td>\r\n14 years<\/td>\r\n13 years<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\r\n
<\/p>\n<\/p>\n

En el \u201cDesign 2\u201d modificamos la arquitectura del \u00faltimo ramal a 1oo2 y vemos que llegamos a SIL-2. Como vemos en la siguiente tabla la contribuci\u00f3n a la probabilidad de fallo de la SIF, en el \u201cDesign 1\u201d, es casi toda del \u00faltimo ramal del elemento final pues la arquitectura es 1oo1.<\/p>\n<\/div>\r\n

\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Design 1 – Final Element<\/strong><\/th>\r\nPFDavg<\/th>\r\nMTTFS (years)<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
LEG 1 (1oo2)<\/td>\r\n1.12E-03<\/td>\r\n64<\/td>\r\n<\/tr>\r\n
LEG 2 (1oo2)<\/td>\r\n1.12E-03<\/td>\r\n64<\/td>\r\n<\/tr>\r\n
LEG 3 (1oo2)<\/td>\r\n1.12E-03<\/td>\r\n64<\/td>\r\n<\/tr>\r\n
LEG 4 (1oo1)<\/td>\r\n1.72E-02<\/td>\r\n125<\/td>\r\n<\/tr>\r\n
TOTAL F.E.<\/strong><\/td>\r\n2.05E-02<\/strong><\/td>\r\n18.2<\/strong><\/td>\r\n<\/tr>\r\n
TOTAL SIF<\/strong><\/td>\r\n2.10E-02<\/strong><\/td>\r\n14.2<\/strong><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\r\n
<\/p>\n<\/p>\n

De<\/a>s<\/a>cargar<\/a> SILcet COMPLEX ARCHITECTURES MANUAL.<\/p>\n<\/p>\n

Art\u00edculos relacionados:<\/p>\n<\/p>\n

Arquitecturas<\/a><\/p><\/p>\n<\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[158,160,186],"tags":[],"class_list":["post-3880","post","type-post","status-publish","format-standard","hentry","category-actuador-es","category-arquitecturas-es","category-sif-es-2"],"yoast_head":"\nArquitecturas complejas en el elemento final (I) — Seguridad Funcional<\/title>\n<meta name=\"description\" content=\"Explicamos el caso de una arquitectura compleja en el elemento final de una Funci\u00f3n Instrumentada de Seguridad (SIF). 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