Dry powder extinguishers are similar to dry chemical extinguishers except that they extinguish the fire by separating the fuel from the oxygen element or by removing the heat element of the fire triangle. Dry powder extinguishers are for Class D or combustible metal fires ONLY.
Can dry powder be used on metal fires?
Standard dry powder extinguishers can extinguish almost any type of fire. Specialist dry powder extinguishers are for certain types of metal fires. However, because of the dispersal of powder, it’s important not to use them in enclosed spaces.
What is one characteristic of a metal fire?
Generally, metal fires are a hazard when the metal is in the form of sawdust, machine shavings or other metal “fines”, which combust more rapidly than larger blocks due to their increased surface area. Metal fires can be ignited by the same ignition sources that would start other common fires.
Which extinguisher is most appropriate for a Class C fire?
Powder extinguishers are a good multi-purpose fire extinguisher because they can be used on Class A, B and C fires.
Which extinguisher is most suitable for oil fires?
Wet Chemical fire extinguishers are the most effective against Class F fires (cooking oils and fats) e.g fats, grease and oil. Therefore they are practical in a kitchen environment.
What should you not use a dry powder fire extinguisher?
They can be used on fires involving solid combustibles, flammable liquids and electricity. When considering a dry powder fire extinguisher for a premises with electrical goods, it is worth noting that these extinguishers leave a residue that may be harmful to sensitive electronics.
What is a dry powder fire extinguisher made of?
ABC powder is made up of ammonium or mono-ammonium phosphate mixed with other powders to improve the flow or add bulk. ABC powder is often referred to as general purpose or multi-purpose extinguisher powder and is capable to fight class A, B and C fires.
Where can you use dry chemical powder fire extinguisher?
What fires can dry chemical powder fire extinguishers be used on?
- Class A Fires – paper, cardboard, wood, fabrics, people etc.
- Class B Fires – flammable liquid fires, petrol, deisel, oil etc.
- Class E Fires – electrical fires, computers, photocopiers, switchboards etc.