IEC61511 recognizes Fire and Gas Systems (FGS) as mitigative SIS systems. The major focus of a FGS is to mitigate an incident AFTER it has occurred. This is done to gain time for people to evacuate the area, contain the incident from escalating and allow for emergency response teams to assess and deal with the incident. By monitoring process areas where fire, build up of a potentially flammable gas or toxic gases may occur, the DeltaV SIS™ system can detect these hazardous events, alert personnel and initiate timely actions in order to minimize the consequences of a incident. Fire & Gas Systems are usually stand alone systems that take actions when required. With today’s technology, many companies utilize an integrated approach and interfaced the FGS with the ESD system to initiate plant shutdown if hazardous events occur. The integrated system can alert personnel in a fast, accurate and structured way, giving employees time to decide which course of action to take while bring the plant to a pre-determined state.