/community-hubs/deltav-community-connect/b/safety-weblog/posts/safety-instrumented-system-useful-life-1832770940Safety instrumented systems (SISs) are used to reduce risks and bring to process to a safe state in the event of an upset or abnormal condition. Assessing this risk over the lifecycle of the operations is part of the IEC 61511 global safety standard.en-USTelligent Community 13