来源：http://www.vranime.net/ 点击次数： 发布时间：2018-11-12
莱芜保安消防知识介绍 灭火常识 ：
Knowledge of fire safety and fire prevention:
1. foam extinguisher for fire and usage
Scope of application
It can be used to extinguish general class B fires, such as oil products, grease and other fires, or class A fires, but it can not extinguish water-soluble flammable and flammable liquid fires in class B fires, such as alcohol, ester, ether, ketone and other material fires, nor can it extinguish live equipment and class C and D fires.
Usage: the lifting ring on the upper part of the portable cylinder is rushed to the fire field. At this time, we should pay attention not to make the fire extinguisher too inclined, not to take or reverse, so as to avoid mixing the two agents and spraying ahead of time.
When the distance is about 10 meters from the ignition point, the cylinder body can be reversed. One hand holds the lifting ring tightly, the other hand holds the bottom ring of the cylinder body, and the jet is directed at the burner. When a flammable liquid fire is extinguishing, if it is already flowing like a combustion, the foam will be sprayed from near to near, so that the foam will be completely covered on the combustion liquid surface. If burning in the container, the foam should be directed towards the inner wall of the container, so that the foam will flow along the inner wall and gradually cover the fire level.
Do not directly aim at the liquid surface injection, in order to avoid the impact of the jet, but the burning liquid will be washed out or washed out of the container, expanding the combustion range. When fighting solid matter fire, the jet should be directed at the most violent burning place.
When the fire distance is shortened, the user should gradually approach the combustion area, and then foam will be sprayed on the combustible until it is extinguished. When used, the extinguisher should always be in an inverted position, otherwise it will interrupt the injection.
(portable) foam fire extinguishers should be kept dry, cool, ventilated and easy to use. They must not be near high temperature or may be exposed to the sun, so as to prevent the decomposition of carbonic acid from failure. In winter, anti freezing measures should be taken to prevent freezing.
2. safety trolley foam extinguisher adapted to fire and usage
It is suitable for fire and portable chemical foam extinguishers.
Usage: When in use, it is usually operated by two persons. First, the fire extinguisher is quickly pushed to the fire site and stopped at about 10 meters from the fire point. After one person releases the spray hose, the spray gun is grasped by both hands and the burning place is aligned. The other hand wheel is rotated counter-clockwise to raise the screw to the highest position, so that the cap opens. Then the cylinder is dumped backward, so that the rod touches the ground and rotates the valve handle 90 degrees, so that the foam can be sprayed to extinguish the fire. If the valve is mounted in the spray gun, the valve is opened by the person who is responsible for operating the spray gun.
Fire extinguishing methods and precautions are basically the same as those of portable chemical foam extinguishers. Because of its long spraying distance and long continuous spraying time, the fire extinguisher can give full play to its advantages and be used to fight the initial fire in larger storage tanks or tankers.
3. air foam fire extinguishers adapted to fire and usage
Scope of application:
The scope of application is basically the same as that of chemical foam extinguishers. But anti foam fire extinguishers can also extinguish fire caused by burning of water-soluble flammable and flammable liquids such as alcohols, ethers, ketones and other solvents.
When you use it, you can quickly rush to the fire field on hand or shoulder, pull out the safety pin at 6 meters away from the burning object, hold the opening handle in one hand, hold the spray gun tightly in the other hand, press the opening handle tightly, open the seal or puncture the sealing piece of the gas storage bottle, and the air foam can be ejected from the nozzle of the spray gun. The fire extinguishing method is the same as the portable chemical foam extinguisher.
However, when the air foam extinguisher is used, the fire extinguisher should always be upright, and should not be inverted or lying in bed, otherwise it will interrupt the injection. At the same time, hold the opening handle tightly and do not let go. Otherwise, the jet will be interrupted.