What is the primary extinguishing agent used in the fire detection system of a gas turbine?

The primary extinguishing agent used in the fire detection system of a gas turbine is Halon gas. Halon is favored because of its effective properties in suppressing fires, particularly in enclosed spaces like gas turbine compartments. It functions by interrupting the chemical reactions that occur in fires, efficiently quenching flames without leaving behind residue. This characteristic is crucial in environments where electronic equipment is present, as the potential for water or foam to cause further damage is significant.

Halon's ability to deal with various classes of fires, including those fueled by flammable liquids and gases common in gas turbine applications, makes it an ideal choice for this setting. While other extinguishing agents like carbon dioxide, water mist, and foam have their uses, they may not offer the same level of effectiveness or safety in the unique environment of gas turbines. For instance, carbon dioxide can be effective but may not adequately cool the burning material or may pose risks to personnel in confined spaces due to its asphyxiating properties.