what is a foam proportioner

A compressed air foam system (CAFS) fire truck and a dry powder fire truck may both be used for fighting flammable liquid and gas fires. Both are specialized vehicles designed to handle Class B and Class C hazards. However, their extinguishing agents, working principles, and application scenarios are fundamentally different. This article explains the key differences between dry powder fi...

The fire truck pump and spray system is the core of firefighting operations. It acts as the "powerful arm" of the fire truck. By converting engine power into pressure (ranging from 0.8 to 1.4 MPa), it delivers extinguishing agents to heights of up to 85 meters — whether it is a high-rise building fire in a dense city center or a petrochemical storage tank fire in an industrial zone, the fire...

The fire truck foam system mixes water with foam concentrate at precise ratios (1%, 3%, or 6%) to create a foam solution. This solution is then pressurized by the fire pump and expanded with air through foam nozzles — this is the core working principle of how a foam fire truck mixes foam and water — ultimately producing a stable foam blanket that covers the fuel surface. This process increases fir...

Fire rescue truck needs vary drastically between metropolitan areas and rural or small-town communities. Large urban fire departments rely on heavy duty fire trucks with massive water tanks, high rise ladders, and full industrial-grade configurations to handle high rise fires, industrial blazes, and large-scale emergencies. However, for small cities, rural towns, village fire stations, and volunte...

In firefighting operations, the selection of discharge mode directly determines fire extinguishing efficiency, operational safety, and fire control effectiveness. Most people are unaware that fire truck nozzles can switch among three core discharge modes: straight stream, spray stream, and safeguarding stream. Different modes vary significantly in flow pattern, range, impact force, and coverage ar...

A fire truck typically carries firefighting, water supply, rescue, and safety protection equipment. Common equipment includes fire pumps, water tanks, fire hoses, fire nozzles, fire monitors, valves, fire ladders, rescue tools, protective gear, and communication devices. This article systematically breaks down the classification, functions, and selection considerations of standard fire truck equip...

When it comes to fighting fires in high-rise buildings, industrial facilities, or large warehouses, aerial fire trucks are indispensable. But among the various types of aerial apparatus, two often cause confusion: the aerial platform fire truck and the water tower fire truck. While they may look similar at first glance—both feature hydraulic booms and are designed for elevated fire...

A rescue fire fighting truck is a specialized emergency vehicle designed to perform both fire suppression and rescue operations. Unlike standard fire trucks that focus primarily on extinguishing fires, rescue fire fighting trucks combine firefighting equipment with rescue tools, lifting and hoisting devices, cutting and spreading tools, winches, generators, and lighting systems.     This...