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Where can dry powder fire extinguishers not used?

Where can dry powder fire extinguishers not used? Correct Answer All of the above

Explanation:

Class F Fire

  • Class F fires are caused by the ignition of cooking oils and fats.
  • These fires occur when said oils or fats reach their flashpoint – in this case, flash point is around 315°C.
  • At 340°C, cooking oils and fats can achieve autoignition – that is to say, they can set alight without a flame or other ignition source.
  • These fires can be extremely dangerous and can spread very quickly.
  • To extinguish a Class F fire, you need a wet chemical fire extinguisher.
  • All other types of fire extinguisher are unsuitable for these types of fires. 

Confined spaces 

  • Confined spaces can be permanent workspaces or temporary construction sites where chemical work, welding, and flame cutting take place.
  • Either way, the additional risks caused by working confined spaces include;
    1. A lack of oxygen
    2. Too much oxygen
    3. Flammables and explosives
    4. Gas contamination
    5. Excessive heat

Fire extinguishers should be avoided in confined spaces

  1. Carbon dioxide fire extinguisher
  2. Dry powder fire extinguishers
  3. Halcon fire extinguishers

Fire extinguishers should be used in confined spaces

  1. Water extinguisher
  2. Foam extinguisher 

Additional Information

Dry powder extinguishers: 

  • Extinguishers fitted with dry powder may be of the gas cartridge or stored pressure type.
  • The main distinguishing feature is the fork-shaped nozzle.
  • Powders have been developed to deal with class D fires. 
  • Dry powder extinguishers have Blue labels on the top of the cylinder

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