Foam extinguishing systems

Foam extinguishing systems, depending on the design of the system and the way in which the foam is obtained, can be divided into internal and external foam generation systems. Foam in the system is formed by interaction of a chemical foaming liquid with air (air-mechanical foam) or with air and water in special air foam syringes (chemical foams).
Foam extinguishing systems are designed to combat Class B fires, and systems with external foam generation (with a lot of water) are also suitable for fighting Class A fires. In ships, this system is mainly used for the protection of boiler rooms, machinery, and pumping stations. Systems with internal foam generation (air-mechanical foam) may be fitted instead of carbon dioxide fire protection systems in some cases.

Schemes of systems for fire protection foams with internal and external foam generation

Foam extinguishing systems consist of:
        Chemical foaming liquid;
        Connection to the water fire protection system;
        Connection to the ship compressed air system;
         Compressed air tank;
     Mixer;
       R antisyringe connection nozzles;
  R air foam syringe;
      Reduction valve;
       Safety valve.