Firefighting foam | How does foam extinguishes fire ? | fire fighting training Video
Channel: firefightersblog
Date: 2022-01-29

Firefighting foam | How does foam extinguishes fire? | fire fighting training Video 
Water is universal fire extinguishing media but due to its some physical properties and its incompatibility with certain substances, it is not best for all class fire #suppression. Hence some alternate #firefighting #media is needed to extinguish Class B, Class D and electrical fire.  Here we are going to discuss the firefighting foam used for Class –B fire that is hydrocarbon liquid fuels fire. #Firefighting #foams are used for Class B fire. Class B type of #fire is a fire involving combustible and flammable hydrocarbon liquids like gasoline, (petrol-diesel), alcohol etc. The density of these hydrocarbon flammable liquids is less as compared to water, hence when water apply on fire to these liquids, it settles down and liquid flammables overflow from the container, hence exaggerating the risk of spreading of the fire due to spill over. These fires can be also extinguished by dry chemical powder, The knocking of flames with dry chemicals is faster as compared to foam but the re-ignition of the fire is a major issue with dry powder.  As you know fire can be extinguished by cooling, starvation, smothering and by the inhabitation of chain reaction. Firefighting foam extinguishes the fire by smothering, that is mean when foam applies on the flammable liquid surface it makes the layer of foam bubbles on the surface and cut off the air/oxygen supply to extinguish the fire. In addition firefighting foam help in reducing the vaporization and avoiding the re-ignition of fuels. What is foam? How it is produced? Firefighting foam is the solution of 94 -97 % water, 3-6 % foam concentrate and air. When a solution of water and foam concentrate apply through foam making branches or equipment air induce in this premixed solution and foam bubbles farm. Firefighting foam can be used for fire protection and fire suppression as portable fire extinguishers filled with premixed foam solutions, through mobile foam tenders or as fixed firefighting systems. 
 ⌚Timestamps for video :
00:00 How does foam extinguishes fire?
01:49 Properties of firefighting foam
03:37 Types of foam
04:15 Protein foam
04:52 Fluoro protein foam (FFP)
05:17 Aqueous film forming foam (AFFF)
06:06 Film-forming fluoro protein foam (FFFP)
06:32 Alcohol resistance foam
08:14 Classification of foam based on expansion 
08:43 Low expansion foam
09:10 Medium and high expansion foam
09:36 Hazmat foam

🔗Other useful resources: Our blog: An introduction to firefighting foam  : https://firefightersblog.com/knowledge-center/f/an-introduction-to-firefighting-foam-%7C-firefighters-blog

🔗 Our other youtube video : 
Aeroplane Accident and Emergency Evacuation: https://youtu.be/F08Se0dJ_Hk
Gwalior Hydraulic Platform Accident: https://youtu.be/TzWPoPqwy30

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