Does the fire category of 20% ammonia water belong to Class B?
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As the title suggests, does the fire category of 20% ammonia water fall under Category B? Do 20% ammonia water pumps need to be explosion-proof? Do 20% ammonia meters need to be explosion-proof?
Ammonia in ammonia solution has relatively high volatility; therefore, it is recommended that facilities related to ammonia solution, such as those surrounding the ammonia tanks, be designed with explosion protection in mind. The specifications do not clearly specify whether it should be classified as Category B; from a safety perspective, it is recommended to treat it as Category B.
This issue can be handled together with the one I mentioned just now. . . According to the information I obtained, as long as ammonia vapor is released from the storage tank, it must be designed for fire protection in accordance with Class B tank areas, with a spacing of 30 meters
For 20% ammonia solution storage tanks, a large amount of ammonia vapor evaporates at this concentration; the vapor pressure of ammonia at 20°C is 29.51 kPaA, and the explosive range of ammonia in air is between 15% and 27%. It is reasonable to classify ammonia under fire prevention category B. All electrical metering equipment must be designed to be explosion-proof for ammonia environments. There have been many explosions in ammonia tank accidents; you can look them up online.
For the 20% ammonia water storage tank, I consulted those responsible for formulating safety regulations; according to these regulations, its fire classification is Category B, based on the properties of ammonia gas. Electrical metering equipment is designed for explosion protection in an ammonia environment.
It can be designed as Category C, referring to clause 3.2.15 of the DL/T 5480 Code for Design of Denitration Systems in Thermal Power Plants
GB51045-2014, \"Technical Code for Denitration Engineering in Cement Plants\", 4.1.2: The fire separation distance for reductant storage facilities shall comply with the relevant provisions of the current **standard \"Code for Fire Protection Design of Buildings\" GB50016. Among them, the fire separation distance for urea storage facilities shall comply with the fire resistance requirements for Class C buildings, while the fire separation distance for ammonia tanks and urea solution tanks shall follow the regulations applicable to Class C liquid tanks.
Suzhou and other places also follow this approach.