The differences in application fields among high, medium and low expansion foam fire extinguishing systems

I. Low-expansion Foam Fire Extinguishing System 1. Components The main components of the low-expansion foam fire extinguishing system include: fire pumps, pressure-type foam proportioning mixing devices, low-expansion air foam generators, deluges, and other valves and pipe fittings, etc. 2. Fire extinguishing principle: Through a pressure-type proportioning mixing device, water and foam fire extinguishing agent are mixed to form a foam mixture in a certain proportion. The foam is drawn in by the foam generator to form foam, which flows down along the tank wall from the foam nozzle, covering the burning liquid and thus extinguishing the fire. 3. Application Scope: The low-expansion foam fire extinguishing system is suitable for places where Class A (except liquefied hydrocarbons), Class B and Class C liquids are processed, stored, loaded and unloaded, and used. Such as oil fields, oil refineries, chemical plants, docks, underground garages, aircraft hangars, airports, fuel boiler rooms and other places.

Ii. Medium and High Expansion Foam Fire Extinguishing Systems 1. Composition Medium and high expansion foam fire extinguishing systems mainly consist of fire pumps, pressure-type proportioning mixing devices, foam generators, valves, pipelines, etc. 2. Fire extinguishing principle: Relying on the advantage of large foaming volume, although the thermal stability of medium and high expansion foams is slightly poorer, and the foams are easily damaged by flames and affected by outdoor natural wind, the amount of foam generated per unit time is far greater than the amount of foam damaged, thus quickly filling the burning space and extinguishing the flame. 3. Application scope: Medium and high expansion foam fire extinguishing systems are suitable for fighting Class A and B fires, fires in confined Spaces, and controlling flowing fires caused by liquefied petroleum gas and liquefied natural gas. Such as: solid material warehouses, flammable liquid warehouses, industrial plants with fire hazards, underground construction projects, engine rooms, pump holds, cargo holds, etc. of various ships, valuable instruments and equipment and materials, flammable and combustible liquids, and flowing fires of liquefied petroleum gas and liquefied natural gas.