Safety Instrumented Systems Guide

This guide provides a top-level overview of safety instrumented systems (SIS) within the process and energy industries, covering their role in risk management and the lifecycle methodology defined by IEC 61508 and 61511 standards. It discusses key topics such as layers of protection analysis (LOPA), the balance between integration and separation of safety and control, and the challenges of migrating legacy systems to meet current performance-based safety requirements.