Why is it forbidden to make phone calls at gas stations?

At the high temperature of gas station, oil molecules will float in the air. Haven't you ever heard of heat expanding and cold contracting? Everyone knows what happens when natural gas and oil meet Mars in the air. Can you ensure that your mobile phone is not powered on? You really don't fight, not even a hundred people? If there is, the consequences will be irreparable.

I'm glad to answer this question.

For the sake of safety, the gas station is still calling, and the sparks are still there. There are the following points.

First, everyone is responsible for life safety. Safety is no joke, everyone should pay attention. Especially flammable items, you should pay attention.

Second, no matter where you go to see dangerous goods, you should stay away and follow the rules.

The reporter did not burn in the high concentration oil and gas environment in the experiment.

Many friends have this experience, when going to the gas station, if the thugs are stopped by the staff. In most people's general consciousness, hitting people at gas stations may cause potential safety hazards, which will generate tiny sparks to detonate oil and gas in the air; At the same time, some people think that this is a misinformation, and they have never heard of the news that a gas station exploded because of a mobile phone.

So, can a gas station use a mobile phone?

The experimental video attracts attention.

Recently, a video on Weibo's website has attracted many netizens' forwarding and attention. The title of the video is "Why is it forbidden to use mobile phones at gas stations?" The video is 2 minutes long. At the beginning of the video, one person puts three small brackets in a pan, then puts a ball of tin foil paper on the small brackets and sprinkles about 50 ml of gasoline. Then dial the mobile phone near the tin foil group and press the call key and the end key frequently. After a while, the tinfoil paper spilled with gasoline suddenly caught fire. Netizens who have seen this video have lamented that they really dare not make mobile phones at gas stations in the future.

Coincidentally, 2011,Hunan Satellite TV's "Curious Investigation" column once did an experiment on this. With the help of Changsha fire brigade and blasting workers, the experiment simulated the gas station environment in an iron frame with ventilation on all sides. The iron frame is wrapped in cotton and sprayed with gasoline and diesel oil to make the oil and gas in the iron frame reach a high concentration. The four corners of the iron frame are filled with gasoline in plastic barrels and connected with wires to simulate an oil tanker. When the staff wearing explosion-proof clothes walked into the iron frame and turned on the telephone and current, the explosion really happened.

On the contrary, there are many conclusions.

On the other hand, the experimental results are also worthy of our attention. The reporter put the paper ball stained with gasoline into the shoe box, sprayed gasoline in the shoe box and covered the box cover. After the gasoline volatilized for a while, I dialed my mobile phone in the shoe box and there was no burning scene.

It is understood that mythbusters, one of the brand columns of the American Discovery Channel, has also done this kind of experiment. The experimenter made an explosion chamber, put the mobile phone in it, and injected atomized gasoline into it to control the oil-gas mixture ratio suitable for explosion. After everything was ready, the experimenter dialed the mobile phone. The result is also motionless.

In addition, in 200 1 year, Glenn Kuriger of the wireless electromagnetic induction research center of the University of Oklahoma in the United States completed the most extensive and detailed research, and the team concluded that the so-called mobile phone call generated sparks and then detonated the oil vapor dispersed in the air. This is only theoretical speculation, and it will only happen under extremely harsh conditions, which is impossible in reality.

This experiment is only of reference value.

Faced with two different experimental results, a professor from the School of Mathematical Physics and Information Engineering of Zhejiang Normal University said that under normal circumstances, the mobile phone is not enough to detonate the combustion, and the experiment is only of reference value. The above experiments are all simulated gas station environment, not real gas station environment, and whether the explosion is caused may be related to the items used in the experiment. For example, the properties of tin foil paper and paper ball which can produce reflection and eddy current effect are different; The concentration of oil and gas in the air is different; The quality of mobile phone is different from that of hardware; Electric sparks generated by wires (not mobile phones) may interfere with the experimental results and so on.

He also saw a video, which was taken by the surveillance of a gas station in the United States a few years ago. When a lady refueled her car, she went back to the car to answer a phone call, put down the phone, walked out of the car door, adjusted her clothes and returned to the vicinity of the oil gun. Suddenly, the muzzle of the oil gun that was refueling exploded and burned. "Some people say that it was caused by answering the phone, but I think it may be caused by static electricity on her body."

The professor said that in order to detonate the oil and gas in the air, the mobile phone at the gas station must meet certain conditions, such as sufficient oil and gas concentration and enough electromagnetic energy to cause electric sparks and generate static electricity.

Professional interpretation of safety director

Director Ni, who is in charge of security affairs in Jinhua Sales Branch of PetroChina, told the reporter that the reason why it is stipulated that gas stations cannot use mobile phones is because mobile phones do not have explosion-proof functions. When in use, the signal is sent in the form of electromagnetic wave, which may generate current under certain conditions. Gasoline in gas stations is a volatile substance, which easily forms an oil-gas mixture in the air. When the concentration of oil-gas mixture reaches the explosion limit, an explosion accident may occur. In addition, sometimes the buttons of mobile phones may generate small sparks during use, which is why gas stations prohibit the use of mobile phones.

During the interview, the reporter also learned that oil and gas recovery devices and Korean explosion-proof specific pathogen free are widely used in gas stations in Jinhua city. The former is used for unloading port and refueling gun, which can reduce the volatilization of gasoline in the air when unloading and refueling, and is economical, environmentally friendly and safer. Korean explosion-proof specific pathogen free is applied to oil storage tanks. According to the news from Xinhua News Agency, this system can eliminate static electricity and prevent lightning strikes. Even if there is electromagnetic wave or open flame near the oil storage tank, this technology can instantly block the flame propagation and electromagnetic wave energy release, thus preventing explosion.

Director Ni reminded that all safety devices and systems are designed to improve the safety factor, and there is no need to disobey the safety system just because of safety devices and systems. Gas stations are places with very high safety requirements. Once something goes wrong, it's too late. Banning mobile phones is a preventive work, and I hope that the majority of car owners will abide by it.

conclusion

There have been a lot of simulation experiments at home and abroad about whether using mobile phones in gas stations will cause safety accidents such as explosions, and the results are still different. But what is certain is that gas stations are inflammable and explosive places, and it is possible to ignite and detonate with mobile phones under some special conditions. Moreover, many seemingly ordinary behaviors in life may bring security risks. No matter how small the hidden danger is, we'd better be able to prevent it from "burning". I also hope that all citizens and friends can abide by the rules of not using mobile phones when refueling at gas stations, especially in areas near refueling guns and oil storage tanks, and should raise their safety awareness.

Little knowledge:

What do you know about gas station safety?

Gas stations are places where car owners often go, but how much do you know about safe refueling at gas stations?

Insiders told reporters that the gas must be turned off at the gas station. Don't use mobile phones, walkie-talkies, mobile phones on the fuel tank cover, and don't carry kindling. At the same time, there are several things that gas stations can't do and are easily overlooked.

It is reported that most motorcycle owners often start in the same place after refueling, but in fact they can't do this. Different from the automobile manufacturing process, the motorcycle may generate sparks at the moment of ignition and the exhaust gas injected, so it is very dangerous to start in the refueling operation area. Therefore, the motorcycle must be pushed 4.5 meters away from the refueling area to start.

In addition, the tanker, underground oil tank outlet, vent pipe and oil drain in the gas station are all within 3 meters of the explosion-proof zone, so special attention should be paid. Many friends have noticed that the gas station staff are wearing anti-static overalls, and the plugs in the explosion-proof area have explosion-proof functions. These are all measures to reduce accidents. As a car owner, you should also pay more attention.

Of course, the construction and operation of gas stations have very strict standards. As long as car owners abide by relevant regulations, their safety awareness has not been relaxed, so don't worry too much.

Prevent fire caused by static electricity

Because making a phone call may produce radio frequency current, it will produce electric sparks in metal conductors, especially in places with corrosion or unstable contact, which will suddenly detonate flammable gases in the air.

When the mobile phone is in normal standby, the internal current is only about 8~ 10mA. When the mobile phone is connected, including RF antenna, receiver microphone and background light, the current inside the mobile phone may increase to 2-2.5A, which may cause electric sparks. When it comes into contact with dense combustible gas molecules in gas stations, it is easy to cause fire or even explosion. Don't answer the phone at the moment, safety first.

1. Gasoline is a volatile liquid. The pipeline in the fuel tank of the gas station leaks, and the pipeline in the tanker is loose. When the fuel filler and the vehicle fuel tank cover are opened to refuel, the gasoline will volatilize into the air, especially when the fuel gun fills the vehicle fuel tank with gasoline.

Oil will push the oil and gas in the fuel tank in the opposite direction, making it drift outward quickly, and the surrounding air will become combustible gas. At this time, it is easy to cause combustion and explosion, leading to disaster.

2. The mobile phone can receive radio waves through the antenna (now the antenna of the mobile phone has changed from external to internal), and when the radio waves touch the antenna, it will generate current. When the current flows between metal conductors, sparks will be generated when it encounters metal corrosion or poor contact, especially for tank trucks and vehicles that are refueling. The duration of this RF spark is 1 microsecond, which will ignite a certain concentration of oil-gas mixture.

Precautions for gas stations:

1, no smoking

Smoking is absolutely forbidden in gas stations. After the car enters the gas station, drivers and passengers are not allowed to smoke inside or outside the station. Because a large number of combustible gas molecules are gathered near the gas station, tiny sparks may cause fire or even explosion. Don't harm others and yourself by satisfying a temporary addiction to cigarettes.

2. Don't be too full.

Put the oil gun as far as possible at the tank mouth, which is too full and easy to cause oil leakage. Generally speaking, it is advisable for a tanker to jump into the gun and refuel automatically. When refueling, put the oil gun into the tank mouth as much as possible, which can reduce the volatilization of gasoline vapor and reduce sparks from the source.

In order to avoid the danger of fire. Many gas station accidents are caused by oil and gas leakage and high-temperature car bodies. So the owner must pay attention to this detail.

3, stop refueling must be turned off.

When entering the gas station to refuel, be sure to turn off the engine, power supply and engine. This can not only ensure the safety of refueling, but also avoid unexpected and uncontrollable consequences in the process of refueling. At the same time, it can also reduce pollutant emissions.

It is forbidden to use plastic containers for gasoline.

Oil products cannot be filled in plastic containers, because oil products will generate static electricity when flowing in plastic containers, and plastic is insulated, so static electricity cannot be eliminated in time. Static electricity will react with oil molecules when it accumulates to a certain extent, which is very dangerous.

5. Don't beat off clothes made of chemical fiber, nylon and knitting.

Don't comb your hair just because you hit or put on clothes made of chemical fiber, nylon or knitting. The friction between them will generate static electricity, which can instantly ignite flammable and explosive gas molecules and spread to the vicinity of gas stations.

Mobile phone @ watermelon VLOG is prohibited in gas stations.

Answering the phone will generate electromagnetic waves, which will easily spark with the volatile gas of gasoline under certain conditions, leading to major safety accidents.

Cell phones need a signal to make calls. The signal is electromagnetic wave. The concentration of oil and gas molecules in the air of gas station is high, which is easy to cause explosion.

As we all know, you can't make a phone call when you refuel, and you are not allowed to use mobile devices to surf the Internet near the tanker. Mainly to prevent the occurrence of high-concentration mixed oil and gas ignited by electric spark. Gasoline and diesel are highly volatile fuels, and the fuel tank filler and oil gun are exposed to the air when refueling. The rapid volatilization of gasoline will lead to excessive gasoline vapor concentration near vehicles and tankers. At this time, if there is an electric spark, it can be directly ignited, and the ignition system of a gasoline engine is actually an electric spark.

Misunderstanding &; Real Concept Any mobile intelligent terminal that can surf the Internet or make phone calls uses "radio frequency electromagnetic waves" to receive or transmit signals. This concept is actually the same as hand-held radios (walkie-talkies) and car stands. These devices will produce electromagnetic radiation, and any "wave" radiation will produce heat energy (to varying degrees), such as microwave ovens; However, the electromagnetic radiation of mobile phones will not produce high heat energy, because the transmission power is actually very small.

Extra knowledge: The peak electromagnetic radiation of mobile phones will still be as high as 500μT (micro Tesla), especially for some elderly people. This degree will have a certain impact on the body, because its intensity has been generally recognized as 400 to 500 times higher than that of cars with electromagnetic radiation; Therefore, it is important to use mobile phones as little as possible and be close to nature.

Core knowledge: Although the electromagnetic radiation of the mobile phone itself will not explode due to its oil-gas mixture, it is very likely that the "antenna" will produce an electric spark! When RF current circulates in a metal conductor, if the conductor is in poor contact due to corrosion or manufacturing process, an electric spark will occur at this position. Moreover, not only the equipment itself may produce electric sparks, but also the metal conductors in the electromagnetic wave emission area will become RF antennas, such as the conduit and shell of the tanker, the shell of the car body and the steel roof. If there is corrosion in these positions, electric sparks may also occur.

Equipment risk Even if the smart phone is designed as a touch screen, its internal circuit board may be poorly contacted due to design defects or aging when it is powered on. If there is such a state, 100% will have an electric spark. However, the shell of the equipment may not have ideal sealing performance, and the high concentration of mixed gas entering the equipment may cause chain combustion and explosion. Among them, the push-button mobile phone will produce tiny electric sparks every time it triggers the button, so this equipment must not be used near the tanker.

Interesting knowledge: Is there a round shiny metal ball in the front of the tanker? The purpose of this ball is not to decorate, but to let the refueling personnel touch it with their hands to release static electricity, so as to prevent static electricity from appearing when holding the refueling gun and touching the car body during refueling. I believe that readers have such an experience. When you take off your sweater in dry weather, there will be scratching static electricity. Do you know how exaggerated the static electricity is? -The instantaneous voltage of electrostatic spark visible to naked eyes is as high as 5000 volts. You know, the household electricity is only 220 volts. Fortunately, the electrostatic current is very small, and there will be no obvious harm. But only half of them are less than the standard for igniting mixed oil and gas!

Summary: I believe that as long as readers can read this chapter patiently, they will not dare to try to use mobile phones in the future refueling process, and will definitely take the initiative to touch the ball of the tanker. There must be a reason why gas stations don't use cell phones. Safety protection will go through many tests, and basic scientific knowledge need not be questioned. It is impossible for people to know all the knowledge, so it is better to develop good habits of believing and obeying in non-professional fields.

Content: original version

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