Classification of explosion-proof areas
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Could some expert explain why the area within 7.5 meters of the source of release is designated as Zone 2 in the diagram, yet the area with a radius of 15 meters is marked as Explosion-Proof Zone 2?
One gas, two in the building. Gases will fill the entire area. Do you think Zone 2 is round or square?
This post was last edited by qugd on 2023-2-12 09:19: “...Why can the area within 7.5 meters of the source of release be classified as Zone 2 in the diagram, yet is a radius of 15 meters marked as an explosion-proof Zone 2?” ” The area within the first 7.5 meters is considered Standard Zone 2, and this is indicated vertically; horizontally, it should be 15 meters (the 7.5 meters are already covered above). Without any additional conditions, this area must be classified as Zone 2 ； Outside a radius of 15 meters, as specified in the standards, that is, between 15 and 30 meters, it constitutes Zone 2 with additional conditions. This Zone 2 is subject to such additional factors as the concentration of emissions, the influence of wind direction and strength, slope, tunnels, and obstacles; therefore, the boundaries of this Zone 2 require further specification based on these conditions. The above is my personal understanding based on the annotations in the diagram. The original poster should understand the entire content of the specifications in context, including understanding the important descriptive terms.
Everything inside the squares is in Zone 2; circles and squares don’t matter. How did 15 meters come about?
I hope so; otherwise it’s impossible to understand
According to the instructions, the areas marked with slashes are all classified as Zone 2, but the label in the diagram shows 15 meters, which is confusing