What is a safety instrumented system?

Safety systems are designed to respond to conditions of the plant, which may be hazardous in themselves or, if no action were taken, could eventually give rise to a hazard. They must generate the correct outputs to prevent the hazard or mitigate the consequences.

Other common names:

ESD: emergency shutdown system

SIS: safety interlock (or instrumented) system

BMS: burner management system

F&G: fire and gas system