A fire extinguisher is the most commonly used fire extinguishing equipment for fighting an initial fire. It is a portable fire extinguishing device that can be moved by manpower. And its structure, method of use are all relatively simple. But it is this kind of simple fire extinguishing equipment, there are still various misunderstandings in the fire science education, resulting in that when a fire comes, the fire extinguisher can only be a decoration.
Promote long-obsolete fire extinguishers
Because chemical foam and acid-base fire extinguishers must be used upside down, there is a high risk of instantaneous pressure, they cannot be sprayed intermittently, and their fire extinguishing efficiency is low. Shanghai began to phase them out in the 1990s, and other provinces and cities have also phased them out. The 1211 fire extinguisher was eliminated in our country more than ten years ago due to the problem of destroying ozone gas after the 1211 fire extinguishing agent was discharged into the atmosphere. However, there are many newly issued wall charts and comic books in the society that still promote the use of the above-mentioned fire extinguishers. These contents are obviously redundant now, and sometimes they will mislead the public to use fire extinguishers wrongly.
Promoting Outdated Taxonomies
According to the classification of the fire extinguishing agent filled, the current fire extinguisher classification method divides fire extinguishers into four categories: water-based fire extinguishers, dry powder fire extinguishers, carbon dioxide fire extinguishers and clean gas fire extinguishers. It can be divided into two types: water type fire extinguisher and foam fire extinguisher. However, there are still many fire science publications, and even the newly built fire science education center divides fire extinguishers into four categories according to the old classification method: water fire extinguishers, foam fire extinguishers, dry powder fire extinguishers and carbon dioxide fire extinguishers. This is problematic. Because with the advancement of technology, water-based fire extinguishers generally contain additives to improve fire extinguishing efficiency and expand functions. Now, if the classification method that is behind the times is spread, the audience will not be able to understand and utilize the expanded functions of water-based fire extinguishers.
exaggerated squirt time
The injection time of a 4 kg dry powder fire extinguisher is generally about 18 seconds, and the injection time of the same water-based fire extinguisher is 30-40 seconds. However, in many fire science education bases, the injection time of simulated dry powder and water-based fire extinguishers of the same level is as long as one minute or even more. It is obviously misleading to use such a simulated fire extinguisher to train ordinary people to master the use of fire extinguishers, because the ordinary people who have received this kind of training only find that the fire extinguisher cannot be sprayed for such a long time when a fire breaks out, and it cannot extinguish the expected fire. fire, you will be at a loss.
Extinguish multiple fires with one fire extinguisher
In some fire science education bases, people can often see this phenomenon: a visitor uses a 4 kg simulated dry powder fire extinguisher to extinguish two or even three fire points, and the screen displays “success”, otherwise it is ” unsuccessful”, which is completely misleading. Because the actual situation is that only when the fires at the two fire points are at the minimum 1A (the basic unit of the wood stack in the fire extinguishing test), it is possible for the fire experts to extinguish the two fires with a 4 kg dry powder fire extinguisher If the fire is lit, if one of the fire points is above 2A, the experts will not be able to extinguish it in 18 seconds. The designers of those bases extended the spray time from 18 seconds to 1 minute, so more than 2 fires could be extinguished. Such training is child’s play, doing more harm than good to the trainees.
Although the fire extinguisher is simple, there is a lot of technical knowledge about it. Anyone who wants to spread the knowledge of fire extinguishers and how to use them, no matter in graphic form or in the form of a simulation device, must first learn this knowledge and keep learning new knowledge. . The dissemination of fire science knowledge must be based on science, otherwise it may enter into misunderstandings. The existence of these misunderstandings is not conducive to the correct selection and use of fire extinguishers by the public, and cannot guarantee the safety of people’s lives and property when the crisis comes, and even cause more serious problems. Therefore, it is necessary to get out of the misunderstanding of understanding and publicity, so that fire extinguishers can truly serve the people.
