The primary disadvantage of fire extinguishers is that they are “one-shot” devices.
What is the primary disadvantage of a fire extinguisher?
The primary disadvantage of fire extinguishers is that they are one-shot devices. The five classes of fires affect the choice of extinguishing equipment: Class A fires involve ordinary combustibles such as wood, paper, cloth, rubber, household rubbish, and some plastics.
What is a disadvantage of multi class dry chemical fire extinguishers?
Reduces visibility when discharged, so consideration required when placing near escape routes, stairwells, etc. May aggravate respiratory conditions when discharged. Limited cooling properties. While Powder is safe for use on electrical fires, it can cause corrosion.
What are the side effects of using a dry powder fire extinguisher?
Adverse health effects and symptoms: Mild irritant to the respiratory system, eyes, and skin. Symptoms may include coughing, shortness of breath, and irritation of the lungs, eyes, and skin. Ingestion, although unlikely, may cause cramps, nausea and diarrhea. Eye Exposure: May cause irritation.
Which are designed to extinguish fires involving combustible metals quizlet?
Special dry powder extinguishers agent and application techniques have been delveloped to control and extinguish fires involving class D combustible metals.
When would you use a dry powder extinguisher?
What is a dry powder fire extinguisher used for? Dry powder fire extinguishers extinguish the fire primarily by interrupting the chemical reaction taking place and cutting off the oxygen supply. They can be used on fires involving solid combustibles, flammable liquids and electricity.
What are the disadvantages of fire?
Disadvantages: Fire can cause soil damage, especially through combustion in the litter layer and organic material in the soil. This organic material helps to protect the soil from erosion. When organic material is removed by an essentially intense fire, erosion can occur.
What are the disadvantages of using a CO2 fire extinguisher?
Disadvantages Of Carbon Dioxide Extinguishers
As CO2 works by displacing the oxygen around the fire, it is not suitable for outdoor use, or in environments exposed to windy conditions. CO2 is a high pressured extinguisher. Using it on class A fires or class F fires could cause the fire to spread.
Which is a disadvantage of a CO2 extinguisher?
Asphyxiation – If a carbon dioxide extinguisher is used in an enclosed or poorly ventilated area, there is a serious risk of asphyxiation. Higher pressure – When discharged, the carbon dioxide in the extinguisher turns from liquid into gas.
What is in dry chemical fire extinguishers?
Dry chemical fire extinguishers use firefighting agents such as monoammonium phosphate, sodium bicarbonate, and potassium bicarbonate. These leave behind a corrosive powder, so it’s important to clean up dry chemical fire extinguisher residue quickly, especially if it has come in contact with metal surfaces.
Are dry chemical fire extinguishers toxic?
In short, NO, dry chemical extinguisher powder is considered non-toxic. However, precautions should be taken when dealing with all types of dry chemical. It is best to wear gloves and a dust mask to prevent irritation from skin contact or inhalation. … Overall, fire extinguisher powder is very safe when used properly.
What does a dry powder fire extinguisher contain?
Ordinary dry chemical extinguishers are used for Class B and C fires only. They often contain sodium bicarbonate (baking soda), which comes out as a white powder.
What is the difference between dry chemical extinguishers and dry powder extinguishers?
What is the difference between dry powder and dry chemical extinguishing agents? There is no difference. These are two different terms for the same thing. A dry powder is compatible with foam; a dry chemical is not.
What is the difference between dry chemical extinguishers and dry powder extinguishers quizlet?
What is the difference between dry chemical extinguishers and dry powder extinguishers? Dry chemical agents are for use on Class A-B-C fires and/or Class B-C fires and dry powder extinguishers are only for use on Class D fires.
How do most dry powder agents extinguish combustible metals?
Most dry powder agents extinguish combustible metals by caking and adhering to the material, which excludes necessary air required for combustion. The burning material should be covered with a 2-inch layer of dry powder. May be difficult to extinguished because of their tendency to reignite.