Military Review

Gas explosion How does it happen and what to do in case of danger?

136
The terrible tragedy in Magnitogorsk raises a lot of practical questions that we would like to ask the relevant public utilities, ministries, officials and even special services. But for the time being we will leave it and wait for at least the first intelligible results of the investigation. Now we have a reason to learn a little about what the explosion of the gas-air mixture is, why it is so dangerous and how to avoid it.




It should be noted that such explosions raise a lot of questions and bewilderment. The vast majority of people find it strange how the explosion of several hundred grams, and in the worst case, a few kilograms of gas can lead to such monstrous destruction. Still, you must admit that a residential panel house should not fold like a house of cards from the slightest impact. Moreover, on the example of many local conflicts, we see that such houses successfully withstand hits from tank guns, including high-explosive ammunition, and sometimes continue to stand (albeit badly destroyed) after being hit by small aerial bombs or multiple launch rocket systems, containing in some cases tens of kilograms of explosives.

And here, it would seem, a trifle: someone forgot to close the gas (although there could be more reasons, and this, alas, not only forgetfulness), and the ensuing explosion of the resulting mixture literally carries the whole span of a building designed with some reserve in case of seismic activity and all sorts of man-made disasters. Often this raises doubts among an inexperienced observer, from whom rumors of terrorist attacks, bombs of tens of kilograms of TNT, total lies of the authorities, and so on, grow.

Unfortunately, even an inquisitive and persistent Internet user is not always able to find qualified information about what constitutes an explosion of a gas-air mixture. The world wide web is literally crammed with many unqualified, and sometimes simply ignorant articles that tell you about the “blast wave flowing through all the cracks”, or the fact that the blast wave with such an explosion lasts much longer and doesn't just hit the obstacle, and literally on it "is trampled down".

In fact, this is not entirely true, and now we will try to figure out how it works and why the first bombs using the principle of undermining (more precisely, very fast burning) of the gas-air mixture were called “vacuum”. And also, how much in common between the explosion of a gas mixture at the entrance of an ordinary house and the Russian vacuum bomb, which the developers call the “father of all bombs”.

How it works

We start from afar - with a school course of physics. And first of all, we recall that the intrinsic velocity of molecules of any gas is very high. Depending on temperature, density, and atomic mass, it can range from about five hundred meters to almost two kilometers per second.

Is it a lot? Well, let's calculate. If the usual wind speed 10 m / s is converted to kilometers, we get about 36 km / h. This wind in the warm summer weather will be just manna from heaven, but in winter it will make us shiver. However, as they say, everything is within the normal range.

But the wind speed 50 m / s means already a hurricane speed 180 km / h. Moreover, the hurricane is very strong - if tropical hurricanes are stronger, then for the Russian Far Eastern limits this is almost a record mark. I myself witnessed the wind 40 m / s, and it should be noted that just walking with such gusts is a difficult and almost heroic exercise.

Tropical hurricanes, as already mentioned, sometimes reach speeds in 250 km / h, and in rare cases even 300 km / h. This is roughly 80-90 meters per second. As a rule, neither trees, nor the majority of buildings (except for capital, made of brick, cement, etc. materials) can withstand such pressure.

And here the author talks about the speed of gas molecules in 500 meters per second and above. Is this some kind of madness?

Not. This is a harsh reality. You just need to remember that usually the gas molecules randomly move, colliding with each other. In most cases, their path between collisions is calculated in fractions of a millimeter, and most importantly - they do not move in an orderly, united front, and act on any object or obstacle uniformly from all directions.

The situation changes a little when the wind arises. Due to various factors (uneven heating of the earth's surface, light / shade, large obstacles, etc.), air begins to flow relatively slowly from higher pressure zones to rarefied zones. On a global scale, we are witnessing cyclonic phenomena, high-altitude aerial transfer, and the like. As a rule, the reason for them is the same: solar activity, uneven heating of the earth's surface, only specific moments like the Coriolis force are added.

How does this relate to the explosion of a gas-air mixture? Straight! That is what we now talk.

With the explosion of any gas-air mixture (and it would be more correct to say if it burns out) the oxygen of the air is associated with the fuel (it can be both household gas and specific substances like ethylene oxide or dimethylacetylene used in vacuum bombs). Since the oxygen content in the terrestrial air (by volume, not to be confused with the content by mass) reaches approximately 21%, the corresponding air exhaustion is formed almost instantly in the gassed volume.

No, we are not talking about a complete vacuum, of course. The pressure in the burnout zone drops by less than a third. But it happens almost instantly, for hundredths of a second. And this is enough so that the surrounding air in an orderly (I will underline this word) wave rushed to the epicenter of the rarefied region. Unfortunately, I did not manage to find figures on the speed of the “collapse” of a rarefied “bubble”. But it is safe to assume that the velocity of molecules of a collapsing gas reaches hundreds of meters per second, and just for a moment, forces arise in the center of the burnt-out volume, the power of which exceeds the power of the strongest terrestrial hurricane (times corrected by volume, of course).

But that's not all. After the "collapse" the air in the epicenter becomes too dense. The most usual "return" arises, and the overclocked air masses rush back, away from the epicenter. An ordinary blast wave arises, but its power can significantly exceed the power of a blast wave during a normal explosion, since both the volume of air involved in the explosion process and the energy received literally “out of nothing” can be several times and sometimes tens of times higher than similar chemical indicators. the explosion of the same initial power output.

This is exactly how it turns out that several liters (maximum) of gas dissolved in air lead to an explosion equivalent to at least ten kilograms of TNT or other explosives.

The mass of the Russian vacuum bomb, known as the “Daddy of All Bombs”, is 7,1 tons. And far from all this weight falls on the active substance - the bomb needs a very strong hull, a parachute, expelling charges, a flammable charge, etc. Its power in TNT equivalent is approximately 44 tons. That is, we can talk about an approximately tenfold excess of the power of the explosion of the gas-air mixture relative to conventional explosives.

And if so, then, probably, one should not be surprised at such a serious destruction in place of a seemingly fairly harmless phenomenon. Well, think about it, "gas flashed." Alas, this “flash” can really lead to great trouble and destruction, and in no case should we forget about it.

How to act in case of danger?

If this happens, and you find yourself in a heavily polluted room, the best thing you can do is to leave it immediately and report it to special services. And you may not know the telephone of the gas service - call the Ministry of Emergency Situations, the fire brigade, the police, in any case they will immediately inform the necessary specialists.

Important! Do not turn on the light in any way! A spark, even a microscopic one, arising in the wiring or directly at the contacts of the bulb, can cause detonation. Even if the light is already lit in the room, still do not touch any switches - the spark most often occurs when the appliance is turned on, and the long-lit light bulb can easily burn and not cause an explosion.

Unfortunately, a situation is possible in which a person cannot immediately leave the premises. For example, if he returned to his apartment, he feels a strong smell of gas and knows that someone from his family is in the apartment. In this case, remember - your stay in the room should be as fleeting as possible! The risk of losing consciousness from suffocation is very high, and without consciousness you cannot help anyone.

In this case, open the door wide. Try to get a full chest of air outside the room (at the entrance, on the landing). Holding your breath, without closing the door (!), Go to the apartment and first of all try to open the window. Any draft in the room in just a few minutes will reduce the risk of an explosion to a minimum!

Having found the victim, do not waste time - pick up and take out of the apartment as soon as possible. If it is very cold outside, you can grab a blanket or take a warm thing in the hallway. If there are several victims, take the first one out to the street, take a deep breath, inform the police / Emergencies Ministry and only after that go after the next one.

In case the strong smell of gas is felt in the entrance, you need to open the doors and try to create the most active air flow. If you still have to go to the porch (and, generally, you should not do this), try to break the windows on the porch windows in order to create as much air as possible.

It should also be remembered that experts do not recommend using even mobile phones and electric torches in a gassed room. It is better to call for help outside a gas-filled apartment, and optimally already outside.

Domestic gas leak - an extremely dangerous incident. Still, it should be remembered that it does not always end in disaster. In Russia, there are hundreds of domestic gas incidents annually. Most often these are explosions of gas cylinders, leaks in private houses equipped with gas boilers, and there are often cases of leaks in apartment buildings. A serious problem is the victim of unhappy love, which someone said that by opening the gas in the kitchen, it is relatively easy to part with life. The life of others, endangered, such sufferers rarely interested.

And yet, in most cases, gas leak incidents end without human victims. Therefore, you should not panic and feel doomed by smelling the smell of gas in the room: as a rule, in most cases the situation is saved by a simple call for help and following the simplest recommendations.

The explosion of the gas-air mixture still relates to complex phenomena, depending on various factors, difficult to calculate. That is why, by the way, terrorists almost never use this method - a small gap in the attic hatch can make all their efforts unsuccessful with much greater efficiency than even the efforts of the all-powerful FSB.

Nevertheless, the state is simply obliged to address the issue of gas security. Now, in the era of one hundred percent coverage of cities and even large villages with the Internet, it seems not so difficult to develop appropriate devices that signal an increased gas content. Surely, you can learn to turn off a house from gas supply on the first signal of gas pollution, without waiting for a group of technical specialists to come to the place.

And then we find money for the next “pipe bypassing”, and we don’t even find it difficult. But to ensure the safety of hundreds and thousands of Russians - "expensive."

Yes, just forbid Gazprom from entering into new gas export contracts until the country has solved the problem of security of gas communications. Just ban!

And you can not even imagine how quickly this issue will be resolved.

In the meantime: Magnitogorsk against the Nord Stream 2. And we know that we will win ...
Author:
136 comments
Ad

Subscribe to our Telegram channel, regularly additional information about the special operation in Ukraine, a large amount of information, videos, something that does not fall on the site: https://t.me/topwar_official

Information
Dear reader, to leave comments on the publication, you must sign in.
  1. 210ox
    210ox 3 January 2019 06: 23
    +13
    “Just forbid Gazprom to conclude new contracts for gas export until the problem of the safety of gas communications is resolved in the country. Just ban it!” Dear Kuzovkov ... How do you propose to solve the problem of the “fool”, but just the type who was cut off gas and he brought a gas cylinder or decided to make repairs. And he just did not give a damn about his worthless life and the life of those around him ... And the fact that you went through the "national estate", do you think it's real?
    1. 3x3zsave
      3x3zsave 3 January 2019 06: 41
      +27
      Gas cylinder equipment is generally a separate song, in our country it meets safety certificates only at the time of sale. Sometimes you look at how the installers of suspended ceilings work ... Guys, you're suicides!
      1. Achilles
        Achilles 3 January 2019 09: 49
        +5
        You just need to install a gas analyzer (sensitivity is greater) + siren, in the event of a gas analyzer triggering and then a siren is triggered, then everyone wakes up in the apartment (or better, the whole staircase heard a siren, this is from suicide) and at the same time the gas pipe is blocked automatically if cylinder, then at least a signal will make it clear that there is a gas leak and you need to evacuate. Then everyone will sleep peacefully and there will be no such destruction, and if they do (the suicide turned on the balloon) then at least everyone will hear the siren and have time to escape.
        1. CERBERFOL
          CERBERFOL 3 January 2019 10: 10
          +3
          If the terrorists cannot blow up gas in the apartment, they will find another way.
          1. Stas157
            Stas157 3 January 2019 15: 18
            +2
            My first thought was - weren’t it too often that houses began to explode from gas? More recently, in Izhevsk, the entire corner of a 9-storey building collapsed from a gas explosion ... And in other countries, houses just as often explode?
            1. Shurik70
              Shurik70 4 January 2019 01: 43
              +3
              We’ve got a gas meter. And after that an ambush appeared. If you do not use the stove for a couple of days, then this effect occurs.
              Bring a burning match. Ignite the gas. The burner lights up normally, and after 7-8 seconds goes off. But the kettle has already been set on the stove, and the fact that the burner has gone out is not visible! It must be ignited again, after that everything is on normally.

              But if every day, several times a day, to use, there is no such effect. And over time you forget about the ambush. You will come home in the evening after going home, put the kettle on and leave for the room, watch the news on the Internet, wait for the kettle to whistle. And the burner went out, the gas goes.

              So it’s not necessarily a human factor or a terrorist. It could be faulty, or such buggy gas equipment. Do houses often explode? So the counters set.
            2. ufpb
              ufpb 6 January 2019 15: 50
              0
              In Ukraine, in December 2018, three cases of an explosion of domestic gas in high-rise buildings. In our district center in a two-story BRICK on the ground floor it started to blow. There were no deaths, only the wounded. The reason is the greed of the gas transportation company, for all the garbage (checking the hood), give me the cash. Or meter readings, but like the rest of the gas economy - on the drum. This is in Ukraine.
          2. Sirocco
            Sirocco 3 January 2019 15: 23
            +11
            Quote: CERBERFOL
            If the terrorists cannot blow up gas in the apartment, they will find another way.

            Gentlemen, what are we talking about? I told you more than once that we are fed by the media and we spit on each other, worse than delirium about a gas explosion, I did not hear and did not see and that’s why, in the early 90s I saw the consequences of a gas explosion in an apartment of a 5-story building, the apartment and is located on the 1st floor, after the explosion, windows and frames flew out of the apartment as well as from the entrance, the wall panel left the landing site five centimeters. The house and apartment still stands. The second, in a gas explosion, even in the entrance, and in all apartments, the blast wave would have to go out through the windows of which is a complete house, and it is not correct to compare the gas-air mixture with tens of kilograms of TNT and etc.VV Thirdly, in all heating boilers at enterprises, in the gas exhaust system there are explosive valves (like windows in the entrance, apartment) in the event of an explosion of air-dusty gas mixture in the boiler, these valves are knocked out.
            Once again, I don’t know what gas it was and how much it was, but what I saw with my own eyes, and this is an emergency, it doesn’t fit with these consequences of the last explosion. Yes, there is no such destruction during a gas explosion in an apartment. What was it? riddle, terrorist attack? don't know redevelopment of the apartment? Gas doesn't stack up like that at home.
            1. Petrograd
              Petrograd 5 January 2019 13: 00
              +3
              I met information that replacing wooden windows with double-glazed windows is another condition for an increase in the force of the explosion (wooden window frames with ordinary glass fly out in a moment, unlike double-glazed windows), I cannot judge, I am not an expert. One thing I can say for sure, from the experience of working on kilns (cement production), if the first time the burner is not fired up, then it is necessary to "ventilate" the kiln for about 20 minutes. Usually, they "hammered" into this, as they say, and almost immediately re-ignited, and so a couple of times, "banged" so that the oven doors flew out, the glass in the workshop broke, after all, there was force (in fact, this is also an explosion) quite large, but this is at an enterprise, but in a residential building how many burners had to be kept open to create such a volume of air-gas mixture?
              1. g1washntwn
                g1washntwn 9 January 2019 07: 21
                +1
                Double-glazed windows are held on two bolts (at best) and mounting foam. So sometimes they fall out just from trying to wash them.
                1. Petrograd
                  Petrograd 11 January 2019 03: 06
                  +1
                  Perhaps in new buildings (to speed up and reduce the cost), as well as unscrupulous would-be craftsmen, this is so, but as an example I will tell you in 2010. in the Leningrad region there was a strong hurricane, almost all the double-glazed windows survived, the wooden ones were broken. I do not quite agree with you. Regarding the polyurethane foam, it is of course a "universal" object for construction, like scotch tape in everyday life, but still not a means of replacing standard fasteners.
            2. your1970
              your1970 5 January 2019 15: 20
              +2
              Quote: Sirocco
              5 ti storey building, the apartment was and is on the 1-th floor,
              -there could be a leak in the stairwell entrance other volume of gas exploded
        2. Winnie76
          Winnie76 4 January 2019 02: 30
          +1
          Quote: Achilles
          You just need to install a gas analyzer (sensitivity for more) + siren, in the case of a gas analyzer and then a siren is activated, then everyone wakes up in the apartment (or better, the whole staircase heard a siren,

          Darling, this is a long time ago. In any boiler room. Only here is what to do with false alarms if the sensor is hypersensitive
          1. Petrograd
            Petrograd 9 January 2019 00: 10
            0
            And if the gas is not odorized (garlic smell), in industrial enterprises (for the sake of economy) they sin.
        3. Vladimir 5
          Vladimir 5 6 January 2019 20: 10
          +1
          The author's opus looks more like a pseudoscientific verbiage, many words have been written, but the main thing has not been said, but is trying to bring "dregs". Household gas is heavier than air, and is collected first from the ground, later entering, it rises higher and the explosion occurs at a certain gas-air composition (depending on the composition of the gas). Then there is a powerful explosion, in other ratios the combustion is less explosive and the cotton is weaker .... Additives are added to the gas, which immediately you can feel the "gas", or rather its additives. And not feel a significant amount of additives in the incoming gas
          impossible. Further, the measures are very simple, block the intake and ventilate the room, because in rooms with gas appliances there are windows according to the conditions of installation and use of devices. A very correct suggestion is to fix a gas analyzer-fuse for every household gas cylinder, which indicates the increased presence of gas in the air. The cost of the massive is almost penny. Also extend to kitchens with gas stoves for citizens. Only on the Magnitogorsk tragedy there are more questions, for there is much that is not clear and looks like deliberate release and detonation of gas ...
          1. E_V_N
            E_V_N 7 January 2019 22: 16
            +3
            You will watch a video of a quadrocopter flying around the destroyed entrance. You were not alerted that the wall overlooking the street remained intact along its entire height, neither slabs, nor windows and glazing of balconies could take out on this wall. The whole is the lift shaft and the apartments of the second wing of the entrance. It turns out that there was no gas contamination of the entrance areas, just as there was no complete gas contamination and the destroyed wing of the entrance. The UK was told that no traces of explosives were found "in the samples taken", but how the samples were taken.
            1. Vladimir 5
              Vladimir 5 7 January 2019 22: 57
              +1
              Always in power, things turn out for them in an advantageous way and there is no need to search for truth, as they say, it will be so ... And what will change when the highest lies are already a systemic phenomenon ...
            2. Fast_mutant
              Fast_mutant 8 January 2019 09: 14
              +1
              And in order to switch attention on all channels, they are playing the story of the boy's happy rescue! Of course it's a pity for the child (and everyone who is no longer), but this "thing" works very clearly. No one is talking about the explosion itself, everyone is watching the fate of the child! May he be healthy!
          2. miner
            miner 8 January 2019 08: 20
            +1
            Network gas, i.e. methane, is lighter than air. Gas in cylinders, i.e. propane-butane, is heavier than air. The gas analyzer has a very limited service life.
          3. srha
            srha 8 January 2019 17: 14
            +1
            Why are you misinforming the people? Look at the reference books first. CH4 - has a molar mass of 16g, which is almost two times lower than air. Natural gas (in burners), mainly composed of methane "Density: from 0,68 to 0,85 kg / m³ relative to air" (https://neftegaz.ru/tech_library/view/4357-Gaz-prirodnyj) - on you can launch balloons with it. Ethane, butane and propane are heavier than air. Acetylene is slightly lighter than air.
            1. Vladimir 5
              Vladimir 5 8 January 2019 20: 34
              0
              Srga. I agree with you. The accident was mainly from bottled gas (frequent switching, flexible hoses, etc.), which is why I talked about it. Of course, pipeline gas has lighter constituents (methane), which means it’s going down from the ceiling ...
        4. ivanec
          ivanec 7 January 2019 17: 00
          0
          The nonsense is complete, and if the lights are turned off, and if at least one sensor fails ...
      2. Vadim237
        Vadim237 3 January 2019 12: 27
        0
        Argon arc welding is much better.
    2. Boris55
      Boris55 3 January 2019 08: 44
      +4
      Quote: 210ox
      "Just forbid Gazprom to enter into new contracts for gas export

      Do you think that gaz.prom has the right to issue a law under which the service provider is responsible for the equipment (like electricians for meters)? Maybe it’s all the same the responsibility of the Duma that it divided and allowed this to happen?

      ps
      Foreign trade can be prohibited, but do not forget that the 1 / 3 of the budget is the money of mining companies. So you personally agree to receive less on 1 / 3 until Gazprom gasifies the entire camp. I doubt including simple solutions are not always true.
      1. Olgovich
        Olgovich 3 January 2019 09: 29
        +9
        Quote: Boris55
        Do you think that gaz.prom has the right to issue a law under which the service provider is responsible for the equipment (like electricians for meters)? Maybe it’s all the same the responsibility of the Duma that it divided and allowed this to happen?

        It is necessary to change the operating rules, although it is expensive.

        It is strange to read this in an article:
        It seems not so difficult development of appropriate devices that signal an increased gas content. Surely you can learn disconnect this or that house from gas supply at the first signal of gas pollution,

        Such devices have long been existMoreover, in our multi-storey buildings with autonomous heating by a gas boiler of each apartment, it is installed in each apartment according to the project without fail.

        It is called "Gas Alarm with DN15 Solenoid Valve". Catches the smell of gas and shuts off the flow - automatically.
        If you put them in every apartment where there is gas equipment, then the question closes automatically.
        The cost in Russia at retail is 4 rubles. Those. taking into account the wholesale and installation, 000 thousand for each apartment can be secured.

        You can only put the sensors in the cabinets, and the latch on the porch, the house. We must think and pay ...
        1. greenegro
          greenegro 3 January 2019 11: 20
          0
          .. and regularly pay for quality service, 500 rubles per apartment ..
          1. Olgovich
            Olgovich 3 January 2019 12: 17
            +3
            Quote: greenegro
            .. and regularly pay for quality service, 500 rubles per apartment ..

            in year. That's not a lot.
            1. greenegro
              greenegro 3 January 2019 13: 11
              +1
              If the year is normal, but check the health of the gas analyzer also once a year?
              1. Olgovich
                Olgovich 3 January 2019 14: 45
                +2
                Quote: greenegro
                If the year is normal, but check the health of the gas analyzer also once a year?

                In my opinion, less often. In metrology they check with a certificate.
                1. greenegro
                  greenegro 4 January 2019 13: 31
                  0
                  In metrology, this is a calibration that is usually once a year, but for households it may be less frequent, and performance testing is another topic ..
            2. PROVINCIAL
              PROVINCIAL 6 January 2019 15: 54
              0
              With our HOA - per month !!!!
            3. Fast_mutant
              Fast_mutant 8 January 2019 09: 17
              0
              There are already "a little" like that for 5-6 tyrov a month for a communal apartment!
        2. svd-xnumx
          svd-xnumx 3 January 2019 17: 23
          +8
          It is called "Gas Alarm with DN15 Solenoid Valve". Catches the smell of gas and shuts off the flow - automatically.
          If you put them in every apartment where there is gas equipment, then the question closes automatically.
          Even now, scammers walk up the entrances and poke dummies for 6-10 thousand old people under the guise of gas analyzers, and when the installation is put into obligation, having given it to private owners, the number of these peddlers will increase tenfold.
          1. vladimirvn
            vladimirvn 4 January 2019 10: 40
            +1
            Quote: svd-xnumx
            and when the installation will be put into obligation, having given it to private owners, the number of these peddlers will increase tenfold.

            A similar story is now with water meters. This is some kind of mockery.
        3. Winnie76
          Winnie76 4 January 2019 02: 36
          +1
          Quote: Olgovich
          You can only put the sensors in the cabinets, and the latch on the porch, the house. We must think and pay ...

          I also deal with these sensors. The whole point is that the human nose picks up the smell of normally odorized gas much earlier than the sensor fires. Well, do not install methane sensors at every point in space.
          1. greenegro
            greenegro 4 January 2019 13: 42
            +1
            Usually, sensors are placed over gas equipment at a certain distance from the ceiling, and it seems that there are standards for the volume of the room, how many sensors are needed. For the kitchen, one is enough, not at the window, of course, hang. A very sensitive sensor and you need to check for performance often, at least once a month, if necessary, quickly replace .. You can calculate how many apartments a day the installer is really able to bypass the apartments to check without hackwork at work, with a normal salary which is clear to the tenants. will be formed, taxes and profits for the service organization ...
            1. Winnie76
              Winnie76 4 January 2019 18: 45
              +2
              Quote: greenegro
              Usually, sensors are placed over gas equipment at a certain distance from the ceiling, and it seems that there are standards for the volume of the room, how many sensors are needed.

              And the sensors are installed and the distance is not more than 25 cm from the ceiling and the projects used to be done by gas contamination and check them once a month. It’s a fiction anyway.
              Quote: greenegro
              You can calculate how many apartments per day the installer is really capable of getting around the apartments to check and without hacking in work

              I check them. I can probably get around 200 apartments a day. Only all this is useless.

              In a real room, it is not known where the maximum concentration will be collected. It is impossible to fully check the system (it is impossible to pollute the room, it is not known where the leak will be), therefore the sensor is checked directly by the zilch from the cylinder. Before the sensor works, the room will have such a smell that hang an ax (people are the best sensor, subject to normal odorization)
              1. greenegro
                greenegro 6 January 2019 07: 40
                0
                Hmm, 200 apartments a day go around and check ... Suppose, for one apartment for 5 minutes - it’s to get to the next door, call, wait for it to open, go in to remove shoes and put on replaceable shoes, conduct an external examination of gas equipment, get a bottle with with a rotameter, get close to the sensor, check for operation, make a record of the check and the result of the check, fold back your equipment, change shoes again. Then, 5 minutes to multiply by 200 will work 16 hours a day, sort of a little too much ...
              2. Petrograd
                Petrograd 9 January 2019 00: 19
                0
                I agree with you, but forgot, ventilation is forced, this is when "household" air is removed from the premises due to the pressure difference, everyone forgets about it (including explosive and fire-hazardous mixtures)
        4. your1970
          your1970 5 January 2019 15: 23
          0
          there are GSM apartment alarms which include gas / water leakage sensors. The maximum configuration is 7,5-8 000 rub. For the protection / notification of gas leaks or gas leaks - quite a bit, installation is simple
      2. 210ox
        210ox 3 January 2019 09: 42
        0
        I don’t think. Read the article. These are the words of the author.
  2. 3x3zsave
    3x3zsave 3 January 2019 06: 30
    +9
    Good article. Unfortunately, in addition to Gazprom’s baryzhnik, there is a banal everyday slovenliness. The gasman came, issued a prescription, and then somehow, not before that now ...
    In an hour, I’m going to eliminate the defects according to the order issued by the fire inspector to my customer back in September. Why January 3rd? Because on the ninth, the inspector will come again and there will be a sickly fine and the closure of the enterprise until eliminated. Roasted rooster is our everything!
    1. Ross xnumx
      Ross xnumx 3 January 2019 06: 47
      +4
      The key point of the article is
      But to ensure the safety of hundreds and thousands of Russians is “expensive”.

      While the provision of "insecurity" does not threaten any office that operates the housing, no one is insured against a repetition of the Magnitogorsk tragedy.
  3. Rimlianin
    Rimlianin 3 January 2019 06: 33
    -6
    It is necessary to ban the use of natural gas and propane in cylinders in panel high-rise buildings! You can also cook soup or tea on an electric stove. I myself live in such a house and am afraid. Not worth the dubious energy savings of so many lives.
    1. 3x3zsave
      3x3zsave 3 January 2019 07: 23
      +26
      Just do not forget that the condition of the house electrical networks in such buildings is about the same as the gas equipment. Moreover, it is design. 3,5 kW per apartment, maximum 10A. And we are for this happiness - a kettle, microwave, heater ... One! The machine gun knocked out! We’ll stick it more powerful! And we will observe the gentle glow of the wires from under the plaster.
      1. Mordvin 3
        Mordvin 3 3 January 2019 08: 26
        +4
        Quote: 3x3zsave
        And we are for this happiness - a kettle, a microwave, a heater ...

        I don’t use these .. Anton, and the gas should stink badly? And then yesterday out of curiosity I opened the burner for a couple of seconds. Almost no smell. Either my sense of smell has deteriorated from old age, or I really save on odorants. It seems that the smell was stronger before.
        1. Vasilenko Vladimir
          Vasilenko Vladimir 3 January 2019 09: 09
          +3
          Quote: Mordvin 3
          and gas should stink badly?

          the gas itself should not stink at all which additive is added for smell
          1. Mordvin 3
            Mordvin 3 3 January 2019 09: 12
            +4
            Quote: Vasilenko Vladimir
            the gas itself should not stink at all which additive is added for smell

            I write about
            Quote: Mordvin 3
            whether they really save on odorants.
            1. garri-lin
              garri-lin 3 January 2019 17: 32
              -1
              Flavourless propane, butane is added. Here it stinks.
            2. 3x3zsave
              3x3zsave 3 January 2019 19: 31
              +2
              Mercaptan is now expensive! request lol On the other hand, before, the sun shone brighter and the grass was greener ... crying
              1. Mordvin 3
                Mordvin 3 3 January 2019 21: 13
                +1
                Quote: 3x3zsave
                On the other hand, before, the sun shone brighter and the grass was greener ..

                And was the smell better? belay Well, I can call someone younger, but what's the point? If they have nothing to compare. It’s necessary to start a dog, and somehow drag it to gas. what
                1. 3x3zsave
                  3x3zsave 3 January 2019 21: 31
                  +4
                  The sense of smell was really better. I distinguished a bored girl for thirty meters. By smell. Or were they vibes?
                  If in terms of smells and anxiety, then cats are better, because egoists save their skin, well, at the same time, but just open the window ... But the dog will die next to you, but it will drag you to life to the end.
                  1. Mordvin 3
                    Mordvin 3 3 January 2019 21: 39
                    +1
                    Quote: 3x3zsave
                    The sense of smell was really better. I distinguished a bored girl for thirty meters. By smell. Or were they vibes?

                    Of course vibes. I had the same ones. It seems the girl was bored, and as a result - zilch. laughing
                    Quote: 3x3zsave
                    If in terms of smells and anxiety, then cats are better, because egoists save their skin, well, at the same time, but just open the window ... But the dog will die next to you, but it will drag you to life to the end.

                    So it is necessary to somehow train, what would bark, meow with the smell of gas. In, he came up with a technique. Bring them to the open burner, and then a good pendulum. laughing Well, in general, I do not know a dog expert.
                    1. 3x3zsave
                      3x3zsave 3 January 2019 21: 49
                      +1
                      And it somehow worked out for me. Or I missed it, and the girls smelled of boredom ...
                      On the second question: yes, you are a spontaneous canine !. And I kept wondering how dogs are being trained to search for drugs?
                      1. Mordvin 3
                        Mordvin 3 3 January 2019 21: 55
                        +1
                        Quote: 3x3zsave
                        And I kept wondering how dogs are being trained to search for drugs?

                        Seriously, I read that dogs, after several years of service, themselves become drug addicts. Until they breathe, they will not bark. sad
                      2. 3x3zsave
                        3x3zsave 4 January 2019 06: 16
                        +1
                        I would be inclined to this version, but what about the sapper business? Are dogs becoming RDX addicts?
                      3. Mordvin 3
                        Mordvin 3 4 January 2019 07: 06
                        +1
                        Quote: 3x3zsave
                        Are dogs becoming RDX addicts?

                        They don't seem to get high from RDX, unlike cocaine. About the spaniel-addict back in the 80s, like in "Man and the Law" I read. Somewhere border guards in South America had one. First, he quickly found cocaine, and then began to run in circles. Until I sniffed, I did not start barking. wink
                      4. 3x3zsave
                        3x3zsave 4 January 2019 07: 21
                        +3
                        Yes, the dog was simply "hooked"! No normal dog handler will do this. The fact is that cocaine strongly irritates mucous tissues and kills nerve endings, respectively, and receptors. For dogs, through the sense of smell, they receive 50% of the information about the outside world, this is similar to a visual disability in humans.
                      5. Mordvin 3
                        Mordvin 3 4 January 2019 07: 24
                        +1
                        Quote: 3x3zsave
                        Yes, the dog was simply "put"!

                        It is quite possible that I am in oak dog full.
                      6. 3x3zsave
                        3x3zsave 4 January 2019 07: 29
                        +1
                        I am also not a very advanced user, I just love dogs.
      2. Freeman
        Freeman 3 January 2019 13: 48
        +13
        3x3zsave (Anton) Today, 07: 23
        And we will observe the gentle glow of the wires from under the plaster.


        lol Recalled

    2. Vasilenko Vladimir
      Vasilenko Vladimir 3 January 2019 09: 07
      +4
      Quote: Rimlianin
      You can also cook soup or tea on an electric stove.

      they write about such "specialists" in the article, firstly, it will be more expensive, and secondly, it will be more expensive again because it will be necessary to change the wiring, then make repairs and buy new equipment, and thirdly you will shout afterwards that the number of fires has increased
    3. Olgovich
      Olgovich 3 January 2019 10: 12
      +2
      Quote: Rimlianin
      Need to ban use of natural gas and propane in cylinders in panel high-rise buildings!

      gas tanks categorically banned in high-rise buildings and were never allowed.
      For it is a bomb.

      But-dragged into homes with electric stoves, the result is explosions. Which was recently in Chisinau in such a house.
      The result is 4 dead, 4 apartments are destroyed ...
      1. Alexander Bushuev
        Alexander Bushuev 3 January 2019 13: 16
        +2
        my apartment is in a multi-storey building on electric stoves. In case of an accident in the power supply, I take out a compact gas stove (used on roads and outdoors) gas spray (3-5 pieces in stock) and please! not that it’s possible to boil the kettle, it’s quite possible to cook the borscht! and even if such a canister explodes (you have to try it), then the maximum in my kitchen the glass packet will crack or fly out
        1. Olgovich
          Olgovich 3 January 2019 14: 47
          +1
          Quote: Alexander Bushuev
          my apartment is in a multi-storey building on electric stoves. In case of an accident in the power supply, I take out a compact gas stove (used on roads and outdoors) gas spray (3-5 pieces in stock) and please! not that it’s possible to boil the kettle, it’s quite possible to cook the borscht! and even if such a canister explodes (you have to try it), then the maximum in my kitchen the glass packet will crack or fly out

          the result we have such-4 dead, entrance-repair .....
          1. Alexander Bushuev
            Alexander Bushuev 3 January 2019 14: 55
            0
            the size of the spray can - from the elbow to the brush is not enough! deodorant in the toilet is the same size! Is that really possible ???
            1. dzvero
              dzvero 3 January 2019 16: 18
              +1
              If you are talking about a disposable type "bottle of gas for lighters", then you have to be absolutely unlucky ... But if about red "tourist" ones - for 3-7 liters, then they are really bombs. Worst option for home. Lose control over them like two fingers on the asphalt.
        2. Trol_2
          Trol_2 3 January 2019 17: 46
          +2
          It is not a can or a balloon that explodes. A volume of gas mixed with air explodes. It turns out a bomb the size of a kitchen or apartment, with all the cracks. And if it also disperses through the risers and electrical boxes of the floors. If a bicycle wheel bursts with 8 atmospheres, it is a pop and even loud. And if you sharply puncture the wheel of a bus with the same 8 atmospheres, then this is already like hitting the RGD-5. https://vk.com/im?sel=333626336&z=video-126050732_456239211%2F86399226e1b3096965
  4. The comment was deleted.
  5. riwas
    riwas 3 January 2019 07: 16
    +3
    An expensive solution. Gas sensors in each room, automatic shutdown and call services.
    1. Tatar 174
      Tatar 174 3 January 2019 08: 04
      +4
      Quote: riwas
      Gas sensors in each room, automatic shutdown and call services.

      Quote: Victor Kuzovkov author of the article
      development of appropriate gas signaling devices

      Correctly! But there are no other options .... Now that there is a bunch of communication possibilities, it’s not difficult to make an autonomous device installed in any room that sends every minute, for example, information about gas pollution in apartments to automatic receiving devices, and they would immediately send an alarm to the appropriate control room for information and decision making.
      1. Olgovich
        Olgovich 3 January 2019 10: 20
        +3
        Quote: Tatar 174
        Now that there is a bunch of communication capabilities, it’s not difficult to make an autonomous device installed in any room that would send every minute, for example, information about gas contamination in apartments to automatic receiving devices and they would immediately send an alarm to the appropriate control room to inform and make a decision

        In our new homes with autonomous heating in each apartment already install a gas detector with a shutoff valve.
        This is a requirement of the project and related building codes.
        1. your1970
          your1970 5 January 2019 15: 28
          0
          Quote: Olgovich
          In our new homes with autonomous heating, a gas detector with a shut-off valve is already installed in each apartment.
          This is a requirement of the project and related building codes.

          in our old houses where they began to make autonomy due to the closure of boiler houses in 2000, it also worked obligatory, they are everywhere
    2. Mr Credo
      Mr Credo 3 January 2019 09: 16
      -1
      And cameras came across every corner. TV cameras are not expensive? But even in garage cooperatives are!
  6. Qwertyarion
    Qwertyarion 3 January 2019 07: 39
    +16
    The explosive limit of natural gas is the gas content in the air from 5 to 15% per 1 cubic meter. air.
    With a gas concentration of up to 5% in the air, nothing will happen, with a concentration of 5 to 15% there will be an explosion, with a concentration of over 15% there will be no explosion, but there will be volumetric gas combustion (everything will burn out in the room). Gas protection devices turn off the gas when the gas concentration in the air reaches less than 1%.
    Gas protection systems have long been invented and effective. Why they are not installed in storey houses is a question for Rostekhnadzor and lawmakers.
    And they are silent on this issue.
    1. Olgovich
      Olgovich 3 January 2019 10: 22
      +1
      Quote: Qwertyarion
      Gas protection systems invented long ago and effective. Why they are not installed in storey houses is a question for Rostekhnadzor and lawmakers.

      moreover, they already working and protect people!
      1. Qwertyarion
        Qwertyarion 3 January 2019 11: 37
        +1
        Only in industrial enterprises and in the private sector of houses with gas boilers in the basement.
        1. Olgovich
          Olgovich 3 January 2019 12: 19
          +1
          Quote: Qwertyarion
          Only in industrial enterprises and in the private sector of houses with gas boilers in the basement.

          We already have private owners in new high-rise buildings-the requirement of the project.
          1. Qwertyarion
            Qwertyarion 3 January 2019 12: 29
            0
            If there is no single shut-off valve for the entrance combined with sensors in the apartments, then these are not effective half measures.
            In Russia, new high-rise buildings are not gasified; all high-rise buildings with gas were built in the 70-90s of the last century.
            1. Olgovich
              Olgovich 3 January 2019 14: 43
              +1
              Quote: Qwertyarion
              If there is no single shut-off valve for the entrance combined with sensors in the apartments, then these are not effective half measures.

              effective: an apartment with a leak is immediately blocked, the tenant will immediately know.
              Quote: Qwertyarion
              In Russia, new high-rise buildings do not gasify,

              In Moldova, all new floors are gasified, put either an autonomous or mini-boiler house on a house or group of houses. But autonomy more often, in 80% of cases.
              Houses grow like mushrooms.

              I agree that the email is safer, but the price ......
              1. E_V_N
                E_V_N 7 January 2019 22: 39
                0
                Quote: Olgovich
                I agree that the email is safer, but the price ......


                Well, if you deign to compare how many people per year die from gas explosions and gas cylinders with the number of people killed by electrical injuries and from fires caused by short circuits, you will change your mind. In Kemerovo, by the way, no gas exploded, but the electrical wiring closed, and the result is even sadder.
    2. greenegro
      greenegro 3 January 2019 11: 41
      +2
      So these devices must be properly operated, checked monthly with a technical gas mixture, repaired if necessary, checked ... And a very big problem - you need to know and understand in detail how the gas analyzer works, how and what it is checked to personally be sure of the reliability of the test results service organization .. Because, our tender system for concluding service agreements only takes into account who offers cheaper ... and there are probably no conditions in the tender applications for limiting the number of objects for the service team, there is no condition for the minimum salary in the organization for personnel serving gas analyzers ... etc. Even the calibration of devices is a big problem, but you need to remove the devices, so you need to install a replacement, but they are not ... Well, yes, do not complicate :)))
      1. Qwertyarion
        Qwertyarion 3 January 2019 11: 54
        +5
        1. Gas analyzers are subject to verification once a year.
        2. On-site verification cannot be done. This is done at the state institution of the ICSM.
        3. To ensure continuous protection of the facility, an exchange fund of devices is required.
        4. To create an exchange fund of devices, a unified standard of devices for installation in apartments is required.
        A person should not delve into the technical details. Once a year, an employee of the gas service should come to the apartment, carry out maintenance of the gas equipment and replace the gas analyzer with an attorney.
        The task of ensuring the calibration of devices must be assigned to gas services, as well as to require gas services to have the necessary exchange fund of devices.
        In general, this is a question for lawmakers.
        1. greenegro
          greenegro 3 January 2019 12: 35
          0
          ... A person should not delve into the technical details ...
          That is the problem. Is it necessary to delve into the details of the health of your personal car? With a gas analyzer check, they will come once a month, and between the checks, who looks after the equipment?
          1. Qwertyarion
            Qwertyarion 3 January 2019 12: 51
            +4
            Modern telemetry systems are able in on-line mode to monitor the status of the sensor, working or not, as well as to see gas contamination, the sensor itself will command the valve to shut off the gas. Verification of the device is not a repair, but a confirmation of the settings.
            Well, an 80-year-old woman will not be able to understand all this and she does not need to understand it!
            Services should do their work, not the old woman to delve into the appliances.
            1. greenegro
              greenegro 3 January 2019 12: 55
              +3
              This is true. Salaries to football players from Gazprom are a priority, not the safety of old women and newborns ..
              1. Qwertyarion
                Qwertyarion 3 January 2019 13: 06
                +2
                Yes ...., you need to change something in someone’s heads!
  7. 1536
    1536 3 January 2019 07: 49
    +10
    A terrible tragedy, no words ... But for some reason the speech immediately turned to PJSC "Gazprom"? On the one hand, this is alarming when they compare the tragedy in Magnitogorsk with the construction of another gas pipeline to Western Europe, but on the other hand, this is simply an incorrect comparison.
    In each region, city, etc. there are so-called "gas services". It is they who are responsible for the state of the gas economy in the region, it is they who install and check equipment, including metering meters. All these AO services are joint stock companies, subordinate directly to the authorities of the region or city in whose territory they are located. Of course, they are guided in their activities by all sorts of TO, OST and GOSTs, regulations and job descriptions. Of course, they do a great job. But they are on their own. Everything they do is about the benefits or disadvantages of what they do. And how they work can be illustrated by one example from personal practice. For example, an application for connecting a gas stove, left in the so-called "personal account" of the gas service of one of the Moscow region (!) Districts, made already in October 2018, was not only not satisfied, i.e. the stove is not connected, but there is no news of when it will be executed. It is unprofitable business, to connect the stoves in the apartments? And what does Gazprom have to do with it?
    I would like to see the "switchman" as well, what they are now, our "switchmen" for-what-not-in-answer? Probably, "macaroshki" eats and, excuse me, mechanical means of preventing pregnancy buys like any "responsible for the country" citizen.
    1. 3x3zsave
      3x3zsave 3 January 2019 07: 57
      -3
      Because Gazprom is a holding and all these servicing JSCs are its subsidiaries
      In short: "We're all hooked on Miller's"
    2. polar fox
      polar fox 8 January 2019 09: 27
      0
      Quote: 1536
      In every region, city, etc. there are so-called "gas services".

      there is ... 15 tyrov salaries in the area. for this money you have to drive 3 villages in your car (it's about 70 km) as a result, you have to take into account the deduction for your car and gasoline-5-6 tyrov. refuse!
  8. 1536
    1536 3 January 2019 08: 07
    +7
    Quote: 3x3zsave
    Because Gazprom is a holding and all these servicing JSCs are its subsidiaries
    In short: "We're all hooked on Miller's"

    Dear, local gas services are not Gazprom's subsidiaries. These are independent organizations. Read what Gazprom is doing, about its structure and real "daughters". And read what is a joint stock company and what is a public joint stock company, etc.
    1. Qwertyarion
      Qwertyarion 3 January 2019 08: 17
      +6
      There is such a concept as a gas distribution organization. It is these organizations that provide services for the operation of gas equipment and gas transportation to consumers. These offices can be both daughters of Gazprom and independent offices. The status of GRO is assigned by the Federal Antimonopoly Service of the Federal Antimonopoly Service. In Magnitogorsk there are several gas distribution stations.
      Now Gazprom. This is not one office; there are six such enterprises in Russia
  9. Konstantin Shevchenko
    Konstantin Shevchenko 3 January 2019 08: 18
    +9
    The author started so well about the danger of domestic gas, but it turned out to be a choice, gas through Ukraine or Nord Stream 2, South Stream. I doubt that the author does not know what Gazprom and the city gas services are doing, as well as the differences between them. Draw conclusions what is happening here.
  10. nikvic46
    nikvic46 3 January 2019 08: 57
    +1
    From such a disaster, it saves me and my neighbors that we have common gas stoves. There were gas leaks. An emergency number was called by number 04, and instrument specialists quickly fixed the malfunction.
    with private apartments. Some people take it seriously, others don't care. It’s especially dangerous if the owner
    leaves for a long time with faulty gas wiring. It is necessary to find out if there were emergency calls
    leak. Holiday, you understand.
  11. svp67
    svp67 3 January 2019 09: 08
    +3
    If this happens, and you find yourself in a very gassy room, the best thing you can do is to leave it immediately and report it to special services.
    Only a call should be made in CLEAN AIR, outdoors.
    And the explosion of a gas-air cloud, this is what happens when the "volumetric explosion" ammunition is triggered and the force of the explosion exceeds the consequences of an ordinary explosive explosion of a similar mass
  12. Evil echo
    Evil echo 3 January 2019 09: 21
    +4
    Commercialization of technical services will not bring to good. When routine maintenance of gas networks and equipment are considered from the standpoint of economic benefits and feasibility, you can get to a lot.
    1. Ros 56
      Ros 56 3 January 2019 10: 41
      +2
      In recent years, they have been crawling regularly and informally, checking cranes and pipes and inlet hoses.
    2. greenegro
      greenegro 3 January 2019 11: 48
      0
      Already come, and more than once ..
  13. alatanas
    alatanas 3 January 2019 10: 41
    0
    Summarizing all the writing about vacuum bombs - the phenomenon is called a volumetric explosion. The composition inside the volume is a mixture of air and "fuel" (gas, aerosols, oil or gasoline vapor, flour, etc.) in an explosive concentration. During detonation (spark - for example), the same is obtained as in the cylinder of the DVG - the entire volume explodes, oxygen burns out and the effect of a vacuum bomb appears.
    1. KERMET
      KERMET 3 January 2019 12: 49
      +5
      With the explosion of any gas-air mixture (and it would be more correct to say if it burns out) the oxygen of the air is associated with the fuel (it can be both household gas and specific substances like ethylene oxide or dimethylacetylene used in vacuum bombs). Since the oxygen content in the terrestrial air (by volume, not to be confused with the content by mass) reaches approximately 21%, the corresponding air exhaustion is formed almost instantly in the gassed volume.
      No, this is not a complete vacuum, of course. The pressure in the burnout zone drops by less than a third. But this happens almost instantly, in hundredths of a second. And this is enough to ensure that the surrounding air in an ordered (I emphasize this word) wave rushes to the epicenter of a rarefied region.

      As far as I remember from chemistry:
      СН4+2О2=СО2+2Н2О
      those. during the reaction, steam and carbon dioxide are released in parallel with the burning of oxygen, and the reaction proceeds with heat release
      therefore, it is not clear to me what kind of initial rarefaction in the closed volume of the house can we talk about? Just during the explosion of natural gas there is a sharp increase in pressure
      1. dauria
        dauria 3 January 2019 13: 08
        +6
        therefore, it is not clear to me what kind of initial rarefaction in the closed volume of the house can we talk about?


        Do not prevent people from inventing "their" physics. There are a lot of "scientific" funny tales on the Internet now. This is one of them. It's a pity the author, for the sake of solidity, also did not drag the Mendeleev-Cliperon equation. And do not try to send the author to school - I received a warning yesterday for this.
      2. alatanas
        alatanas 4 January 2019 12: 39
        -1
        Discharge is obtained in the center, the shock wave knocks out windows and doors, and then the air returns from the outside and everything starts to burn.
        1. KERMET
          KERMET 5 January 2019 14: 07
          +2
          Behind the high pressure zone (blast wave), a low pressure zone is always created, the explosion (gas) itself is superfast combustion (oxidation reaction) accompanied by an increase in temperature and the formation of combustion products (steam and carbon dioxide). Due to the pressure area, not only doors and windows are knocked out, but even the ceilings, so the houses are destroyed. Subsequent combustion after a gas explosion is not necessary - if, for example, a gas explosion occurs in a concrete basement, then even when the air returns there, there is nothing to burn there
  14. dgonni
    dgonni 3 January 2019 10: 42
    +3
    So far, there is no answer to the question whether the house has been gasified! If there was gasification and an explosion of natural gas, then the collapse is similar to the explosion in Dnepropetrovsk in 2007! But there is one small BUT! Three days in the Dnieper siphon, and on the day of the explosion, gas escaped from the comforts with such force that it demolished the diffusers and finished the fire to the CEILING! In this case, neither the evidence nor the residents of the house reported anything about the gas leak! If the household cylinder exploded, then he would not have inflicted such damage! A maximum of 1-3 apartments would suffer, but without such catastrophic damage! Unfortunately, but I had to observe such cases! So the question is, what did it go awry remains open!
  15. Danny_storm
    Danny_storm 3 January 2019 12: 06
    +1
    Citizens, do you seriously think that a pair of gas cylinders brought down an entire staircase?
    1. Vadim237
      Vadim237 3 January 2019 12: 50
      -1
      If the cylinders were jousting all night, in a room of 100 square meters and a ceiling height of 3 meters, we get 300 cubic meters, an explosive gas concentration of 10% is 30 cubic meters, 100 liters of methane in the air mixture during an explosion give the equivalent of 1 kilogram of TNT - 4 MJ, 30 cubic meters gas-air mixture during an explosion, will give out energy of 1200 MJ - like 300 kg of TNT - so yes the cylinders will collapse the 100% entrance.
      1. Vadim237
        Vadim237 3 January 2019 13: 55
        +1
        The train accident near Ufa in 1989 - the same gas explosion
      2. dgonni
        dgonni 3 January 2019 14: 46
        +2
        If the balloons had been jailing all night, then the stench would have been so much in the entrance that the tenants would have liked either the police or the Ministry of Emergencies.
        1. Vadim237
          Vadim237 3 January 2019 15: 26
          -2
          Well, you don’t have to understand the word literally, just let it through. Rather, on the morning of 31 someone entered the room and turned on the light and hello.
        2. garri-lin
          garri-lin 3 January 2019 17: 53
          +1
          A quality front door will not release gas from the apartment. The smell will come only from ventilation. If the ventilation is good, then the identity will not get to the neighbors either. Plus, they wrote above that sometimes the gas does not smell, or it is slightly expressed.
          1. dgonni
            dgonni 3 January 2019 18: 34
            0
            I already voiced. There is no specifics for gasification at home! If natural gas, then the siphon should have been like in the Dnieper in 2007! There the mixture really exploded on the corridor cell and in the apartments. Here there really was a volumetric explosion at the entire height of the stairwell. And again, the tenants complained about the constant smell of gas 3 days before the tragedy. In cases with Magnitogorsk this is not. If a cylinder with propane. Here I have only one version. Since propane is heavier than air, it goes down, unlike methane, which is the basis of natural gas. then bish he falls into the basement. However, a problem again! In the basement, it would spread throughout the entire area regardless of doors and barriers. and the fuck should have been under the whole house. But only one staircase exploded.
            P.S. 3-4 cylinders of released propane distributed over the basement would make the house shaky. But it could hardly collapse. Something the ends meet.
            1. garri-lin
              garri-lin 3 January 2019 18: 45
              +1
              Too many variables. In the event of a defect in the equipment of the pipeline gas of the balloon, the process of forming the gas-air mixture could take from several days to 5-7 minutes. Depends on leak rate. A large empty volume filled with such a mixture is a finished bomb. What a square, what a basement. Air circulation is sometimes minimal, doors (armored) windows, closed vents and ventilation ducts (rodents so as not to climb).
              1. dgonni
                dgonni 3 January 2019 18: 58
                0
                Doesn't roll. 5-7 minutes. 5-7 minutes is a pure calculation for leaks, the formation of the necessary concentration and the moment the switch is turned on. For air circulation in the old socket, you can ask your neighbors who have the pleasure of living in them. In the basements, no matter what the doors are, there are no apartments. there air walks by itself. For the sewer network, I'm just silent. Propane would have got there too. Because the network data is even lower in level, and in the event of an explosion, the manhole hatches would fly into the air no worse than ZERO.
                P.S. Sad for the residents who suffered. Damn what a new year :(
                1. garri-lin
                  garri-lin 3 January 2019 19: 04
                  0
                  People are very sorry. And thanks to those people who, despite the holiday, help the victims.
  16. Baloo
    Baloo 3 January 2019 12: 34
    +1
    It seems strange to the vast majority of people how the detonation of several hundred grams, and in the worst case a few kilograms of gas, can lead to such monstrous destruction.

    The article is interesting. At my dacha, a stove once exploded due to leakage of bottled gas on an area of ​​a little more than 7 sq.m. Shook decently. 10 seconds came to himself.
    Now everyone has gas meters. Perhaps they need to be equipped with a sensor? The sensor does not work, is there no gas?
    Although I am far from the topic.
  17. Evil echo
    Evil echo 3 January 2019 13: 06
    +1
    Quote: Balu
    It seems strange to the vast majority of people how the detonation of several hundred grams, and in the worst case a few kilograms of gas, can lead to such monstrous destruction.

    The article is interesting. At my dacha, a stove once exploded due to leakage of bottled gas on an area of ​​a little more than 7 sq.m. Shook decently. 10 seconds came to himself.
    Now everyone has gas meters. Perhaps they need to be equipped with a sensor? The sensor does not work, is there no gas?
    Although I am far from the topic.

    Recently, cases have become more frequent when some "people" for quite decent money sell alleged gas sensors to pensioners. Over the past year, good fellows have come three times.
    1. KERMET
      KERMET 3 January 2019 13: 36
      +1
      Automatic gas analyzers are a pretty buggy thing, it will all end with the fact that people will simply turn them off due to periodic false alarms
      1. Qwertyarion
        Qwertyarion 3 January 2019 13: 54
        0
        You can disconnect what is personally yours, if the sensor is in a single system, then gas specialists will come to you a couple of times, they will explain that it is impossible to block the sensor, and if there are difficulties with understanding, they will turn off the gas.
        1. KERMET
          KERMET 3 January 2019 14: 00
          +3
          The fact is that, given the total number of these sensors, the services themselves will cease to pay attention to them (remember the explosions in the mines - they just turned off the methane sensors, since the mine had to work, and not stop it for every sneeze), even a planned gas shutdown in apartment buildings - this is a difficult event, and here you offer to turn off when the sensor is triggered ...
          1. Qwertyarion
            Qwertyarion 3 January 2019 14: 24
            +2
            Locking sensors in mines is a crime, for this people are in prison, and they were blocked, as you correctly noticed, precisely because of the high concentration of methane.
            We are with you the technical nuances of installing gas protection and it makes no sense to discuss whether there will be a decision by lawmakers, then the design institutes will settle all the issues, work with people, and test them.
  18. kakvastam
    kakvastam 3 January 2019 15: 18
    0
    The article is good for everyone, but when the gas-air mixture explodes, the enclosing structures are taken out, and not sucked in, respectively, the description of the physics of the explosion, to put it mildly, is somewhat imperfect. And the thing is all in an unsuccessful translation of the term, because the notorious "vacuum" bomb is colloquially called a volumetric explosion bomb, that is, the entire filled volume explodes at once, and even a small excess pressure applied to the entire wall area is enough to blow it off to hell ... A familiar gasman said that an explosion of household gas creates an overpressure of about one atmosphere, which gives about ten tons per square meter, or more than one hundred tons per stove ...
    1. Bigbraza
      3 January 2019 18: 44
      0
      Quote: kakvastam
      The article is good for everyone, but when the gas-air mixture explodes, the enclosing structures are taken out, and not sucked in, respectively, the description of the physics of the explosion, to put it mildly, is somewhat imperfect. And the thing is all in an unsuccessful translation of the term, because the notorious "vacuum" bomb is colloquially called a volumetric explosion bomb, that is, the entire filled volume explodes at once, and even a small excess pressure applied to the entire wall area is enough to blow it off to hell ... A familiar gasman said that an explosion of household gas creates an overpressure of about one atmosphere, which gives about ten tons per square meter, or more than one hundred tons per stove ...

      The flash itself has some shock effect. Glass, frames, even the door can be knocked out. Further, it is more complicated - the first impulse may not be enough, then the structure will collapse from the second, coming from the center. I think that such details can be discussed by experts. Moreover, both to bombers and builders - only together they can understand why the building collapsed so and not otherwise.
  19. Aviator_
    Aviator_ 3 January 2019 15: 58
    +2
    rushed to the epicenter rarefied area

    It seems that everything is correct with the author, but when will he recognize the difference between the center and the epicenter? The epicenter is projection center on the surface where the impact is considered. In an earthquake, this is a projection onto the surface of the earth; in an air nuclear explosion, it is also a projection. In this article, this is the center itself, there is no need to use this beautiful word "epicenter" here.
  20. Den717
    Den717 3 January 2019 19: 47
    0
    Or maybe before "Yes, just forbid Gazprom from concluding new contracts for the export of gas until the problem of the security of gas communications is solved in the country. Just ban it!" wait for the conclusions of the investigation? Who, how, why, why? And then to develop measures, with the definition of responsible persons and sources of financing for implementation?
    1. Vadim237
      Vadim237 3 January 2019 20: 22
      -3
      Gazprom delivers gas to your apartment - you’re cool as a cliff.
      1. Den717
        Den717 3 January 2019 21: 10
        0
        Quote: Vadim237
        Gazprom supplies gas to your apartment

        And what does it have to do with it? Got it? Who cares who supplies? I'm talking about the decision-making methodology. What are you talking about? About cliffs? Geographer?
  21. faterdom
    faterdom 3 January 2019 22: 19
    +1
    An air-gas mixture explosion still refers to complex phenomena, depending on various factors, difficult to calculate

    Especially the concentration in air at atmospheric pressure when the mixture is explosive.
    So for butane - 1.9-8,5% of the content.
    For methane - 5-15%.
    For propane-butane -1,5 -10%.
    Therefore, as advice, airing as actively as possible (windows wide open) is the first measure to rid the premises of an explosive mixture. A very high concentration of gas is no longer explosive (although it creates the necessary concentrations already in neighboring rooms), but it is already fraught with poisoning.
  22. Dazdranagon
    Dazdranagon 4 January 2019 10: 59
    0
    until the problem of gas communications security is resolved in the country
    - Dear, what kind of nonsense are you writing? There is 99% human factor. We are all competent - to move the stove, change the crane ... And how many cases of violation of the integrity of the bearing walls?
  23. dobryKot petersciy
    dobryKot petersciy 4 January 2019 20: 48
    0
    I did not see anything interesting in the article. I did not find the answer to the questions ((
  24. pafegosoff
    pafegosoff 4 January 2019 22: 24
    0
    Since the lack of electricity in a certain region does not allow getting rid of gas in a large house, then where are the gas analyzers with automatic shut-off of gas supply and alarm 04; where are those acquired at the expense of the state and implemented in each! The apartment has modern gas stoves, which are switched off when the operating modes are violated.
    If someone’s gas was turned off for non-payment in someone’s house, there’s constant monitoring (you can use an electronic type seal with an immediate message to the service at the autopsy) and some other measures. In the end, this is not a private house, hundreds of people will die here because of a sleeping boiler.
  25. Dimon71
    Dimon71 5 January 2019 21: 50
    0
    In Yerevan, in every apartment, the state installed a gas analyzer, and in which case it shuts off a selenoid on a pipe. It’s true Chinese and a couple of times it worked for me on its own.
  26. Mana mana
    Mana mana 6 January 2019 02: 19
    0
    An interesting picture turns out that now the terrorists do not have to bother to get any saltpeter or aluminum powder in large quantities. Now everything has become much simpler: I rented, it means, whatever apartment (preferably on the first floor) in the house where the gas was supplied, turned on all the burners in the gas stove, and wherever at the end of the apartment put some kind of electric "breaker" (that would spark) ... The gas is gaining the desired concentration and this explosive mixture blows the floor of the house to pieces ...
    1. polar fox
      polar fox 8 January 2019 09: 34
      +1
      Quote: ManA-manA
      what is it that now terrorists do not have to bother to get any saltpeter or aluminum powder in large quantities.

      here is another question: WHY is it for terrorists? (although, depending on who you call it that ...) that, in this case, someone declared their requirements? Conditions? .. rather, this is another act of intimidation for the electorate, for the next milking thereof.
      1. Mana mana
        Mana mana 8 January 2019 16: 05
        +1
        It's just that recently, too often, something at home from gas began to explode, thoughts arise suspicious, but about all sorts of requirements and various statements there ... Maybe it's something else, to show the "worthlessness" of the current government .... The retirement age was raised, gasoline the price rises, the forest is stolen and sold to the Chinese, and then even before the heap of the house I explode from gas ...
  27. NordUral
    NordUral 8 January 2019 19: 49
    +1
    Author! Why are these near-technical details? Do not push into our heads the idea that we are stupid people (in particular, those who died in Magnitogorsk) who do not pay attention to the smell of gas in the apartment or on the site.
    Recently we had a gas inspector’s check, they didn’t find anything regarding gas leaks, but my wife sniffed such a faint smell of gas that I didn’t feel the first time, and you tell us that we’re not able to smell a huge concentration of gas, only with which may cause great destruction, but not at all such that all the floors are formed like the ITC towers in America (and there was a blast or something else that is used when demolishing buildings). Therefore, please do not hang noodles on our ears.
  28. Photon
    Photon 9 January 2019 00: 26
    0
    Generally, gas, in the event of a leak, must escape through the ventilation. Many can boast that their ventilation is regularly checked? Moreover, the overwhelming majority of the operating organizations in the housing and communal services have no idea how ventilation works. And they do not have ventilation specialists on their staff. All sorts of LLCs like "Horns and Hooves" win tenders by lowering prices. They have no idea only about ventilation. And specialists who understand that nothing can be done for that kind of money are out of work. The information accumulated over the years is lost.
    In general, nothing new :-( Everything is like everywhere in our state.
    1. Mana mana
      Mana mana 10 January 2019 00: 05
      0
      This is if "in the event of a leak" ... And if, in the event of an intentional explosion of the air-gas mixture, then the ventilation can be sealed with some kind of "newspaper", and the gas combs can be turned on at about 4 o'clock in the morning when everyone is asleep (by the way exploded in my opinion at 6 in the morning) ...