"Under the table?" Su Ping tutted: "No, to cause a fire and explosion of this level, the average gas concentration in the room should be more than 1% during the fire... Come on, I know that gas is a mixed gas.

Here, let’s consider all the gases contained in it as a whole to facilitate calculation.

The area of ​​the conference room is not small, 28 square meters, three meters high, nearly 90 cubic meters, and the concentration of 1% is almost one cubic meter.

What's more, we have to consider that the windows have been smashed, and a lot of gas must have leaked outside. It seems that the gas tank will never be too small, even if multiple tanks are used.

If it is a portable small oxygen bottle, it can be hung under the table, but that small oxygen bottle will not release much gas even if it is plastered all over the bottom of the table. The gas tank used by the murderer must be much larger than that small bottle.

Can't go up.

So it’s unlikely that it’s under the table, it must be hidden somewhere else.”

Fang Chang was stunned for two seconds, hesitated for a while, then shook his head and said, "Then I can't figure out where they could hide the gas tank."

When Qi Yuan heard this, he couldn't help scratching his head and asked: "Captain Su, is there any point in guessing where they hid the gas tank? The firemen here will finish surveying the scene later, and they should tell us the origin of the fire and so on.

Yes, then..."

"For fires caused by flammable gas, the point of fire is not necessarily the point of gas 'leakage'." Su Ping glanced at him and said: "For example, if there is a gas leak in the room, someone plugs or unplugs the plug, and an electric spark forms at this moment.

If the gas explodes, then the ignition point is the plug, not the gas tank.

On the other hand, the dispersion of gas is so strong that within a few seconds after a fire breaks out, the entire room will burn together. In this case, it is not easy to determine the ignition point."

Having said this, Su Ping clicked his tongue twice again and said in a lowered voice: "Besides... the county has limited funds and it is difficult to train and hire experts. Therefore, the fire brigade is not like the city's fire brigade. In addition to putting out fires, it can

Conduct a fairly professional survey of the fire scene.

I estimate that once the brigade can extinguish the fire and prevent it from re-igniting, that's the end of it. We will have to do the survey at the scene. Unfortunately, although we all know a little bit about fire scene survey, we are not professional.

So there is no way. It is difficult for us to effectively survey the fire scene where most of the clues have been destroyed by the flames. The shock waves generated by several explosions may also displace many things and change them beyond recognition, so we can only rely on

Use logical reasoning to make guesses.

As for the use of guessing what you said...you regard the fire as a murder case. Do you think the murderer's modus operandi in the murder case is irrelevant?"

Qi Yuan seemed to understand but not quite.

But Su Ping didn't explain anymore. He just talked to Fang Chang. Su Ping was discussing something, and Qi Yuan was listening on the side.

At the end of the discussion, there was no definite result.

Fifteen minutes later, the trace inspectors dispatched by Old Wei, who had been notified by Su Ping earlier, finally arrived at the county bureau. As for Old Wei himself, he still needs to continue to rely on those handicrafts to uncover the clues hidden in them one by one.

Sort it out.

This matter was more critical and he didn't dare to hand it over to others. Su Ping didn't dare to let him hand it over to others. Judging from this fire, not only was this criminal gang more vicious than he had previously expected, but it was also more aggressive towards them.

The degree of penetration is also higher than he imagined, and he can even sneak into the brigade to commit murder...

Of course, it is more likely that the guys behind the gang did something to protect themselves, and it is not directly related to the gang. They just have to guard against it. After all, this matter involves too much and is very critical.

As soon as they arrived, before they had a word with Su Ping and others, the instructor and captain of the fire squadron came to Su Ping, saluted, and told them that the fire had been completely extinguished, and the scene had been cooled down and put out.

With a layer of flame retardant, the risk has been removed and they can enter the site to investigate.

As for the investigation of the fire scene, such as the fire point, he did not say anything, and Su Ping tacitly agreed not to ask, knowing that this matter was beyond the scope of the squadron's capabilities.

"At the grassroots level, the level of professionalism is still not enough." Su Ping sighed softly as he watched the firefighters take a rest.

But there was no way, he couldn't solve it, and it was impossible to solve it.

The professionalization of grassroots teams involves too many aspects. The most important thing is that neither money nor education should be missing. Neither economic construction nor education promotion can be rushed. It is impossible to achieve results in a short time and can only rely on the current situation.

The strategy evolved slowly.

After gathering his thoughts, Su Ping led a group of people into the fire scene.

The firefighters didn't leave either. Although they were sure it would be fine, there was still a slight risk. If they stayed a little longer, they could put out the fire as soon as possible if it broke out.

They squatted aside to smoke, rest, and apply some burn ointment to each other's burned colleagues.

The three trace inspectors quickly went to work. Su Ping and others could not help, so they could only look around.

But there was one thing they determined as soon as they entered the fire scene - the location of the gas tank.

It was really the location that Fang Chang first proposed but thought was unlikely, in the large cabinet of multimedia equipment.

At this moment, the cabinet had been directly deformed by the explosion, and the original appearance was almost invisible. The trace inspector analyzed it for a long time and speculated that a lot of hardware in the multimedia equipment had been moved away, and the space vacated was used.

Come and put the gas tank.

After careful analysis, it was deduced that there were five gas tanks hidden inside, each weighing five kilograms.

The trace inspector looked at it a few more times, opened the notebook, took out his cell phone, opened the calculator, and calculated for a long time. While calculating, he wrote and drew in the notebook, and finally said: "This 5-kilogram gas tank

, as the name suggests, a maximum of 5 kilograms of liquefied gas is allowed in the tank.

The density of liquefied gas is about 580 kilograms per cubic meter. If the gas is full, it is almost 8.6 liters. When liquefied gas turns into gas, its volume expands about 240 times, that is, one tank can release about two cubic meters at most.

gas.

There are a total of five gas tanks hidden inside, which means that the limit can release up to ten cubic meters of gas... Of course, if the gas tanks are not full, or cut corners or something, then it's hard to say."

Su Ping immediately asked: "Can you tell how the valve of this gas tank is opened?"

"Um?"

Fang Chang took over and explained: "We speculate that when we first came in, the valve of the gas tank was closed, and it was opened by remote control after we came in. Can you see the specific method used?

?”
Chapter completed!