Fire experiments: spark temperature instantly thousands, two minutes to start a fire
Release time:
2018-11-23
Source:
In recent times, Ningbo City, four in a row due to unlicensed welding, gas cutting operations and fire accidents caused by the relevant responsible person was held accountable or detained. Yesterday morning, the Ningbo Fire Department conducted a related experiment: the spark temperature instantly rose to thousands of degrees Celsius, only two minutes to ignite flammable materials.
Welding, gas cutting operations why frequent fires, such fires and how to produce, how to avoid fire when operating? Yesterday morning at 10 o'clock, the city fire brigade chose Haishu District, a site to be demolished and relocated for welding, gas cutting operation experiment, restore the fire scene.
The experiment began with the restoration of the welding and gas cutting operation site. In a building hall, workers on the second floor using liquefied petroleum gas and oxygen mixture of equipment, I-beam thermal cutting. He "did not pay attention" is cutting sparks fell on the sofa and carpet in the hall on the first floor. Cutting operations carried out to 2 minutes 11 seconds, the carpet suddenly burst into flames; 3 minutes 03 seconds, the fire rose 1 meter high, the ambient temperature around the carpet reached 105 ℃; 4 minutes 15 seconds, the fire accompanied by smoke has covered the first floor hall ......
"This experiment restores the fire in the annex building of Fu Mao Mansion on October 29, also the sparks 'drilled' through the cracks of flammable materials and ignited the interior." The staff conducted experiments to analyze the principle of electric welding and gas cutting to start a fire, and tested the temperature of the spark and the splash distance.
The data show that the temperature of the sputtering particles of gas cutting sparks is about 1147°C. When leaving the gas cutting source it cools down with time, and the speed of the cooling is related to the size of the particles, the ambient temperature, the wind, and so on. When the particles leave the gas cutting point for 10 to 20 seconds, they still maintain a temperature of about 800℃, which is much higher than the ignition point of general combustible materials. And according to the experimental test, in 1.7 meters high scaffolding for gas cutting operations, sparks splash distance of 6 meters. And in practice, cutting the ceiling and other high-altitude objects, sparks splash range will be greater.
In this regard, the fire experimental personnel to remind the public, welding, gas cutting and other fire hazardous operations of the personnel must be licensed, and comply with fire safety operating procedures. At the same time, both construction workers and supervisors, we must strictly abide by the safety management regulations. If the violation of the rules, once the accident, the responsible person is lightly detained, the serious criminal responsibility.
Copyright: Hunan Anmin Technology Co., Ltd