Health, Safety and Environment

A failure occurs when a device at some level (a system, a unit, a module, or a component) fails to perform its intended function. Each safety instrumented function (SIF) in

A Safety Instrumented System (SIS) is a control system consisting of sensors, one or more controllers (often referred to as logic solvers), and final elements. Another common name is an

What is a Safety Instrumented Function (SIF)? A Safety Instrumented Function (SIF) is a system designed to reduce risks associated with specific hazards by taking an automatic action when required

Safety Integrity Level (SIL) is a quantitative target used to measure the level of performance required for a safety function to achieve tolerable risk for a process hazard. Defined in

The Probability of Failure on Demand (PFD) is a critical metric in safety and reliability engineering. It quantifies the likelihood that a system or Safety Instrumented Function (SIF) will fail

Layers of Protection Analysis Methodology  LOPA (Layers of Protection Analysis) is a semi-quantitative method used to evaluate and analyze risk scenarios with significant consequences or the potential for major accidents.