When we install and use the Heptafluoropropane HFC-227EA fire extinguishing system, we need to pay attention to some problems, such as room size, pressure relief valve, installation location, and so on. These problems are all to quickly make Heptafluoropropane HFC-227EA reach the design concentration required for fire extinguishing.
So a question arises, is the design concentration of Heptafluoropropane HFC-227EA as high as possible?
Isn't the higher the concentration of Heptafluoropropane HFC-227EA, the higher the fire extinguishing efficiency? Of course not, but before answering this question, the answer involves a lot of related issues, and today we will talk about why the design concentration of Heptafluoropropane HFC-227EA is not as high as possible.
The first is whether Heptafluoropropane HFC-227EA is toxic. The answer is yes, but it is low toxicity, not non-toxic. When the concentration reaches more than 10%, there will be a feeling of discomfort, and it will be life-threatening after a long time. Therefore, the Heptafluoropropane HFC-227EA fire extinguishing agent is safe and non-toxic in the normal design fire extinguishing concentration when it is used in the workplace where there are frequent people.
Then Heptafluoropropane HFC-227EA is poisonous, why can it still be used in people's places? It is because before designing Heptafluoropropane HFC-227EA, there will be 30-60 seconds of preparation time to evacuate the people present, and Heptafluoropropane HFC-227EA has no damage to the human body in the state of no fire within the design concentration range! (The design standard is generally 10%, and the toxic reaction is 10.5%). Therefore, it is necessary to find a professional company to design the Heptafluoropropane HFC-227EA fire extinguishing system in the key protection area to ensure the safety of personnel and property.
So will Heptafluoropropane HFC-227EA cause damage to the protected object? The answer is of course not. Heptafluoropropane HFC-227EA has good cleaning properties (completely vaporized in the atmosphere without leaving residues), good gas-phase electrical insulation, and good physical properties suitable for use in fire extinguishing systems. Therefore, Heptafluoropropane HFC-227EA fire extinguishing agent will not cause damage to property and precision facilities, has a short retention period in nature, has high fire extinguishing efficiency, is non-toxic under a certain design concentration, and is suitable for protected areas with permanent staff.
The above problems are all related to the design concentration. The design concentration of the Heptafluoropropane HFC-227EA fire extinguishing system should not be less than 1.3 times the fire extinguishing concentration. The design concentration or actual use concentration of fire extinguishing in the protected area should not be greater than the concentration of toxic reaction. (LOAEL concentration).
Therefore, the design concentration of the Heptafluoropropane HFC-227EA fire extinguishing device is still very important. Generally, it does not exceed 9.0%.