CAFS Compressed Air Foam Fire Systems Working Principle
CAFS is a kind of high energy storage foam. It contains a lot of high pressure air. In CAFS, water is still the most important part. It is mainly pre-mixed with foam, compressed air and water to fully refine and foam the aqueous foam solution. This greatly enhances the ability to penetrate into the interior of the combustor and adhere to the surface of the combustor.
Seven-bubble theory: A small drop of water turns into many bubbles, and the surface area of the water expands by a factor of seven. This greatly increases the adhesion and penetration of the combustion material and improves the coverage and cooling. Seven bubble theory is also known as the CAFS design basis.
Problems with water in extinguishing fires:
1. Low fire extinguishing efficiency (15-20%);
2. The scope of fire fighting is limited;
3. High renewability;
4. Large water loss;
5. Large water demand;
6. The delivery height is limited;
7. Fire trucks and hoses requires high input.
CAFS advantages:
1. The fire extinguishing speed is fast, the reburning is small, and the fire extinguishing efficiency is increased by 5-8 times;
2. Small water loss, easy to protect the scene and fire investigation and evidence collection;
3. The foam has a long holding time, good fireproof effect, good smoke coverage and barrier property;
4. Loss along the way is small, the weight of the water belt is light, the firefighters consume less energy, and their mobility is stronger;
5. Under the same flow and pressure conditions, the range is farther and the vertical liquid supply can reach about 350 meters.
Applications of CAFS：
①Extinguish A, B fires, such as tires, smoldering, vehicle burning. Such fires generate large amounts of smoke and heat when they are burned. Medium foam can be used with CAFS. The fire extinguishing efficiency is 5-8 times that of water fire extinguishing.
②Museums, libraries, archives, precious ancient buildings, laboratories and other special places fire. Such fires use water to extinguish fire, and buildings and indoor valuables are destroyed, and water stains even exceed the burning loss. Using CAFS, dry foam can be used to isolate flames, prevent the spread of fire, and then use medium foam or dry foam to extinguish fires, thereby achieving the dual purpose of extinguishing and protecting buildings and precious objects.
③Large dump or yard fire. The use of medium-foam coverage, long residence time, and low re-ignition property can be used to fight the fire because the amount of water used is small and the amount of dirt removed is small, reducing secondary pollution.
④Cover a lot of smoke and dust while extinguishing the fire. Because the direct impact of water flow is not used, and the use of medium foam or dry foam cover, effectively reducing dust and water vapor, the characteristics of CAFS played a key role in the 9/11 incident.
More details of our CAFS Fire Systems, please kindly visit our website: www.chinafiresafety.com.
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