Explosion protection issues for formic acid equipment
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Projects involving formic acid: they relate to the explosion-proof requirements for certain electrical equipment. The flash point of formic acid is 68 degrees, with an explosion range of 18%–57%. The saturated vapor pressure at 50 degrees is 17.33 KPa. This project involves 85% formic acid, with an operating temperature not exceeding 50 degrees. Therefore, the highest concentration of this substance in the air during operation is: 0.85x17.33/101=14.6%, which is below the lower explosive limit. Additionally, the ambient temperature is below the flash point, so no explosive environment is created; hence, explosion-proof electrical equipment is not required Is the above algorithm correct? Should the impact of the design temperature be considered?
It should not be necessary to use explosion-proof electrical equipment. The operating temperature is not higher than the flash point, and the flash point is high as well; it’s not necessary.
It’s not calculated that way; it’s possible for accumulation to occur, so T3 should be chosen. You can look up more details on Baidu.
This post was last edited by 678-2 on 2017-7-18 at 09:45. In accordance with the provisions of 3.1.1 in the \"GB 50058-2014 Code for Design of Electrical Installations in Explosive Atmospheres\", under the given conditions, it is not necessary to use explosion-proof electrical equipment. For your reference