Guan Feng said, "There's no need to investigate any further!"
Liu Shengguo asked, "Captain, what if it was leaked before?"
Guan Feng shook his head and said, "Judging from the extent to which the valves on site were opened, the gas leak is quite significant. If it had leaked yesterday, the accident would likely have already occurred, and no one would have known until this morning! It's highly likely that it happened this morning!"
Liu Shengguo suddenly realized and said, "That's true! Captain, since we can confirm the gas has escaped, can we infer its concentration?"
Guan Feng thought for a moment, then shook his head and said, "I'm afraid there aren't any concentration measuring instruments that are that precise on site!"
Suddenly his expression turned serious, and he said to Liu Shengguo, "Shengguo! You've given me a good reminder!"
He dialed Zhao Dong's number.
Zhao Dong was investigating when he received a call from Guan Feng, who asked, "Xiao Guan, how's it going on your end? Have you found any clues?"
Guan Feng shook his head and said, "The suspect is very cautious and hasn't appeared on the surveillance footage. Captain, are you investigating the head of the equipment department?"
Zhao Dong said, "Gao Dacheng is questioning the head of the equipment department."
Guan Feng said, "Perfect! Ask the head of the equipment department if they were aware of the damage to the factory's security cameras where the leak occurred. How often do they replace the equipment? Verbal accounts are not enough; it would be best to check the records."
Zhao Dong asked, "What clues did you find?"
Guan Feng shook his head and said, "We haven't found any clues, but the main factory's security cameras have been broken for over a month and no one has repaired them. I'm worried that someone might be deliberately sabotaging the investigation! We need to make sure that this suspect is ruled out!"
Zhao Dong suddenly realized and said, "I understand! Let me find out what's going on."
Guan Feng then said, "Captain, there's one more thing!" He briefly explained what Liu Shengguo had just done, then offered his own method, asking, "Can the technical department determine the approximate time of the leak by analyzing the concentration of the released gas?"
Zhao Dong said, "That's a good method! But generally speaking, it's not easy to investigate, is it?"
At this moment, Guan Feng's common sense kicked in and he said, "Captain, that's what I was thinking too, but is there another way? I saw pressure gauges on site!"
"Ask the staff on duty in the control room. For such an important gas, there should be measuring probes to transmit the pressure to the DCS device in the control room. Here's what I'm thinking: from a physics perspective, once a pressure relief point appears in the pipeline, the pressure in the entire pipeline, including the storage tank, will drop. Could you consider this aspect? Find out the exact time?"
Zhao Dong said in surprise, "Wow, Xiao Guan, I didn't even think of that! You wait here, I'll go in and ask right away."
After hanging up the phone, Zhao Dong walked into the office with some surprise.
Upon seeing this, Gao Dacheng and the others hurriedly asked, "Team Leader, is there a situation?"
Zhao Dong nodded and looked at Director Zhang of the Equipment Department across the table, saying, "Director Zhang, are you aware that the surveillance system in your pressure tank room is damaged?"
Director Zhang nodded and said, "I know, I know! We were just planning to replace it."
Zhao Dong frowned and asked, "Why is it taking so long to replace surveillance cameras in this heavily monitored area?"
Director Zhang sighed and said, "Isn't this because we have too much equipment? We have to replace a lot of equipment every week. For things like surveillance cameras, we usually replace them once a quarter. We don't have enough manpower, otherwise I would have replaced them long ago!"
Zhao Dong asked, "Are there any records of these?"
Director Zhang said, "Yes, yes! I'll have someone bring it to you."
Zhao Dong was a little worried and said, "Where did you put it? I'll send someone over! Zheng Hua! Go over there! Director Zhang, is it convenient for our people to come and pick it up?"
Upon hearing this, Director Zhang knew perfectly well that the others didn't trust him. In fact, before the case was fully investigated, everyone who had access to the factory was a suspect. All he could say was, "Sure, sure!" as he gave them his office address.
Zhao Dongchong said to Zheng Hua, "Go ahead."
"receive!"
Zheng Hua left as Zhao Dong ordered.
Zhao Dong continued, "Director Zhang, normally, such important gas detection should have measuring probes, right? There should be feedback for pipeline depressurization, and your on-duty personnel should be able to retrieve historical curves."
Director Zhang said with some surprise, "Captain Zhao seems to know our monitoring system very well!"
Gao Dacheng also said, "Yes, Captain, you are so thoughtful! We didn't even think of that."
Zhao Dong smiled but remained silent.
How could these people know!
This is something Guan Feng just reminded him of.
He said, "Without delay, let's go to the control room immediately, retrieve the historical curves, and see exactly when the pipeline pressure started to gradually decrease."
"receive!"
Gao Dacheng nodded immediately, then looked at Director Zhang and said, "Director Zhang, please lead the way."
Director Zhang said, "Okay."
He led the way, and soon they arrived at a three-story building.
He explained, "We are a chemical company with a boiler. The pipeline monitoring points you mentioned are integrated with the boiler monitoring points and are ultimately reflected in our DCS system for our personnel to monitor."
As he spoke, the group arrived at the entrance of the control room.
Several men in work uniforms sat in front of computers, monitoring the data in front of them.
"Director Zhang!"
"Hello, Director Zhang!"
Everyone spoke when they saw the newcomer.
Director Zhang waved his hand and said, "You guys are busy! Don't worry about us!" He led a few people to a computer, wanting to retrieve data, but they were a little unfamiliar with it.
He said, "How about I get someone to come over?"
Zhao Dong nodded and said, "Find someone who can keep their mouth shut."
Director Zhang nodded, found a monitoring staff member, and asked, "Do you know which footage shows the pressure tank that leaked this morning?"
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