In fact, this is also a matter of common sense. In the past, liquefied gas tanks, which we often say, now have more natural gas. At first, we cooked with gas. It was not until recent years that natural gas gradually spread to the bottom counties. In fact, everyone knows it's dangerous. You may not have seen the explosion, but you have seen it in movies, right?

Why do liquefied gas tanks explode?

Let's popularize common sense first Liquefied gas tank is a storage tank for storing liquefied gas. When it is filled with liquefied gas, the pressure is very high. A slight improper operation is likely to cause an explosion.

How many firefighters were killed or injured when dealing with the fire or even explosion of hydraulic gas tanks? Here, I really want to pay tribute to the fire officers and soldiers ~

When liquefied gas is at 20 degrees Celsius, its pressure is only 0.8 MPa. If it is at 40 degrees Celsius, its pressure can reach 1.59 MPa. At present, the maximum pressure of our commonly used liquefied gas cylinders is 2. 1 MPa.

If the volume of liquefied gas is constant, the pressure will increase by 0.04 MPa every time the temperature rises 1 degree Celsius, so each cylinder can only hold 85%, which is why people didn't give it to you before, so even if it holds 85%, there is 14.5 kg of liquefied gas.

The most important thing is not to heat the cylinder with warm water when it is empty, otherwise it will cause physical explosion.

At present, natural gas is generally transported by pipeline in family cooking, and the natural gas in the pipeline generally does not explode unless the leaked natural gas reaches a certain concentration in a closed space and meets an open flame.

Four reasons for explosion of liquefied gas tank

Overfilling

As we said just now, liquefied gas has the characteristics of thermal expansion, and its specific gravity decreases with the increase of temperature, while its volume increases.

Because liquid is actually incompressible, if the whole volume of the container is filled with liquefied gas, even if the temperature rises slightly, great pressure will be generated due to the expansion of the liquid, which will lead to the deformation and explosion of the container.

High temperature baking

Liquefied gas storage tanks subjected to flame baking are in danger of steam explosion.

On the one hand, the heat of flame makes the liquid in the tank boil to produce high pressure; on the other hand, due to the influence of high temperature, the tensile strength of the gas tank drops sharply. When the pressure reaches the set pressure of the safety valve, the safety valve will burst and open.

Mechanical collision

Mechanical collision will force the container to be damaged, and the pressure in the tank will drop instantly, causing an explosion.

The danger of mechanical collision mainly comes from the derailment and overturning of LPG tankers during transportation, the collision of tankers during transportation and the impact of surrounding objects on containers.

Equipment defect

If the equipment itself is defective, it goes without saying that there is a great possibility of steam explosion.

Case: liquefied gas explosion? There is a raging fire in the room.

In the old city of Zhangpu, the top floor of a residential building was ablaze with black smoke and crackling noise. Security window has disappeared, and things keep falling, which is very scary.

Investigation results: the accident was caused by liquefied gas leakage and explosion, which led to the collapse of the indoor wall, causing 1 person to be trapped and died after being sent to the hospital for rescue; Another person was burned by a fire caused by a gas leak and explosion.

Are the gas cylinders in our house safe?

The first measure: retirement age

See if the gas bottle has reached the compulsory retirement age. Generally, the service life of gas cylinders is 15 years, and they are tested once every 4 years. It should be scrapped after 15 years.

The second measure: check the regular inspection marks.

According to GB 5842-2006 "LPG cylinders", the designed service life of LPG cylinders is 8 years, and cylinders produced after February 2007 can only be used for 8 years at most;

The third measure: look at the appearance.

Look for deformation, large area corrosion, scratches, fire marks, pits, solder joints, etc. If there is, it is an unqualified cylinder and cannot be used any more.

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For our safety, when using liquefied gas, we must do the following:

A, every time using liquefied gas, after opening the cylinder valve, be sure to check whether there is air leakage phenomenon, no air leakage phenomenon, before ignition. After use, first close the air valve, and then turn off the ignition switch.

Two, in the process of inspection, can only use the gas meter pointer, ears and nose. Never use a lighter to check the ignition. If there is air leakage, immediately close the valve of the gas cylinder and call the ventilation personnel for treatment.

3. If a fire hazard suddenly occurs in the process of using liquefied gas, the valve of the gas cylinder should be closed immediately, and then the surrounding items such as sacks and aprons should be used to put out the fire, and the ventilation personnel should be informed.

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Conclusion: All the contents of this article were originally created by the author (Senior Luo Meng), and no organization, unit or individual may reprint it without permission. The author reserves the right to pursue legal responsibility.