How are the explosion protection ratings of combustible gas detectors classified?
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I would like to ask all colleagues: are the combustible gas detectors installed in the production facility area required to meet certain explosion-proof standards? Is the basis for these standards the highest explosion-proof rating applicable to the entire factory area, or is it determined based on the explosion-proof requirements of each specific production area? For example, some of our facilities are hydrogen-related, while others are not. Then, what explosion protection rating should be chosen for the combustible gas detectors installed in those facility areas?
The key factors are the nature of the emission source and the ventilation conditions in the area surrounding the location where the combustible gas alarm is installed; by referring to 3836.14, it is possible to roughly determine whether the area belongs to Zone 1 or Zone 2, as well as the type of combustible gas emitted by the source. The gas group and temperature group are selected based on the gases emitted by the source. When a point involves multiple release sources, it is necessary to take a comprehensive approach and adopt a higher safety factor. There is also the view that, due to the complex on-site conditions of chemical plants, gas groups and temperature groups are selected by considering the maximum risks.
The key factors are the nature of the emission source and the ventilation conditions in the area surrounding the location where the combustible gas alarm is installed; by referring to 3836.14, it is possible to roughly determine whether the area belongs to Zone 1 or Zone 2, as well as the type of combustible gas emitted by the source. The gas group and temperature group are selected based on the gases emitted by the source. When a point involves multiple release sources, it is necessary to take a comprehensive approach and adopt a higher safety factor. There is also the view that, due to the complex on-site conditions of chemical plants, gas groups and temperature groups are selected by considering the maximum risks.
It is generally set with a higher safety factor.