Dry powder fire extinguisher use method

How to use a dry powder fire extinguisher

When a dry powder fire extinguisher is used to extinguish a flammable or flammable liquid fire, it should be fired at the part of the flame. If the fire of the saved liquid is burning, it should be pointed at the root of the flame and swept left and right until the flame is extinguished. If the flammable liquid is burned in the container, the user should sway the left and right sides of the flame to make the sprayed dry powder flow cover the entire open surface of the container; when the flame is driven out of the container, the user should continue to spray until the flame is extinguished. . When extinguishing a flammable liquid fire in a container, care should be taken not to directly align the nozzle with the liquid surface to prevent the impact of the jet from splashing out the flammable liquid to expand the fire, which makes the fire extinguishing difficult. If the burning time of the flammable liquid in the metal container is too long, the wall temperature of the container is higher than the self-ignition point of the flammable liquid, and it is easy to cause re-ignition after the fire extinguishing. If it is combined with the foam fire extinguisher, the fire will be extinguished. The effect is better.

The principle of two dry powder fire extinguishers

The dry powder fire extinguishing agent is a dry and easy-flowing fine powder for extinguishing fire, and is composed of an inorganic salt having a fire extinguishing property and a small amount of an additive, which is dried, pulverized, and mixed to form a fine solid powder. It is a fire extinguishing agent widely used in fire protection and is mainly used in fire extinguishers.

In addition to special dry chemical fire extinguishing agents for metal fires, dry powder fire extinguishing agents are generally divided into two categories: BC dry powder fire extinguishing agent and ABC dry powder. Such as sodium bicarbonate dry powder, modified sodium salt dry powder, potassium salt dry powder, ammonium dihydrogen phosphate dry powder, diammonium hydrogen phosphate dry powder, phosphoric acid dry powder and amino dry powder fire extinguishing agent.

The dry powder fire extinguishing agent mainly extinguishes the fire by the physical and chemical action that occurs when the powder mist sprayed under the action of the pressurized gas contacts and mixes with the flame:

First, the volatile decomposition products of the inorganic salts in the dry powder, and the chemical inhibition and side catalysis of the free radicals or reactive groups generated by the fuel during the combustion process, so that the combustion chain reaction is interrupted and extinguished;

Second, the powder of the dry powder falls outside the surface of the combustible material, and a chemical reaction occurs, and a glassy coating layer is formed under the action of high temperature to isolate oxygen and thereby suffocate the fire. In addition, there is also partial dilution of oxygen and cooling.

Three dry powder fire extinguisher use precautions

When using a portable dry powder fire extinguisher to save a solid combustible fire, spray it at the most violent place, and sweep it up and down, left and right. If the conditions permit, the user can spray the fire extinguisher along the four sides of the burning material, so that the dry powder fire extinguishing agent is evenly sprayed on the surface of the burning object until the flame is completely extinguished.

The portable dry powder fire extinguisher cylinder is made of high quality carbon steel and processed by special process. Portable dry powder fire extinguisher with simple structure and flexible operation of dry powder fire extinguisher

Wide application, easy to use, low price and so on. The fire extinguisher is mainly composed of a cylinder body, a bottle head valve, a spray hose (nozzle), etc., and the fire extinguishing agent is a sodium hydrogencarbonate (ABC type ammonium phosphate salt) fire extinguishing agent, the driving gas is nitrogen gas, and the working pressure is 1.5 MPa at normal temperature.