Discussion on Fire Hazard Categories of Compressor Buildings
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There is a company. There are two carbon dioxide compressors and two ammonia ice machines in the compressor factory (the area is between 1/3 and 1/4). Should the fire hazard category of the factory be classified as Category E or Category B?
Neither carbon dioxide nor ammonia mentioned by the poster are flammable or combustible gases. "GB 50016-2006 Code for Fire Protection Design of Buildings" 3.1.1 : 1. Production that processes non-combustible substances and often produces strong radiant heat, sparks or flames at high temperatures or in a molten state ； 2. Various productions that use gas, liquid, and solid as fuel or burn gas and liquid for other purposes. ； 3. The above three places where the production of refractory substances are used or processed at room temperature belong to Category D. The place where non-combustible substances are used or processed at room temperature is produced. According to the above situation, the place mentioned by the poster should belong to Class E. I hope the host will be satisfied.
Because the fire hazard of ammonia is classified as Class B, I personally believe that the fire hazard of the workshop is classified as Class B.
The distinction should be made according to the hazard of the most dangerous ammonia. That is, it should be classified according to Class B fire hazard.
It is recommended to consider it according to the Class B fire hazard!
Ammonia fire hazard is classified as Class B, so it should be considered as Class B
When delineating the fire hazard category of a factory building, we first need to know the chemical properties of the raw materials used in the factory area. The poster mentioned carbon dioxide compressors and ammonia ice machines. We can know that the raw materials may be carbon dioxide, ammonia, and compressor lubricating oil. Let’s first learn about the ammonia ice machine. A type of compressed vapor freezer. Low temperature is obtained by the state change of ammonia. It consists of ammonia compressor, condenser, pressure reducing valve, evaporator, etc. Gaseous ammonia enters the ammonia compressor and is compressed to the required pressure (generally 1.06MPa), the temperature rises, and then passes into the condenser and is cooled by cold water to below 30°C, where it is liquefied into liquid ammonia. The liquid ammonia then passes through the pressure reducing valve and is reduced to the required pressure (depending on the required temperature, for example -15°C, it can be reduced to 0.235 MPa), and then enters the evaporator tube to absorb the heat of the frozen material outside the tube, evaporates and vaporizes, reduces the temperature, and uses the material to reach low temperature. After evaporation, the ammonia that becomes gaseous is sent back to the compressor and is compressed again. Such cyclic operation will make the freezing process continue. Analysis based on "GB 50016-2006 Fire Protection Code for Building Design": Here, ammonia, which is the most dangerous, is selected as the analysis object. The lower explosion limit of ammonia is 15% and the upper limit is 30.2%. It is a Class B gas with a lower explosion limit of greater than or equal to 10%. Therefore, it is best to classify it according to Category B.
The fire hazard of ammonia is classified as Class B. The fire protection level in the workshop is high, so I personally think that the fire hazard of the workshop is classified as Class B.