Issues with opening of explosion-proof doorways
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The two fire doors of the explosion-proof vestibule in the synthesis area are arranged out of alignment; under normal conditions, can both fire doors be opened at the same time? Or should a fire door be opened first, and only after all people have entered the vestibule and that fire door has been closed can the other fire door be opened? I checked the building codes and didn’t find any similar requirements.
Fire doors are provided solely for emergency situations; by then, perhaps no one will be following any regulations!
Maybe you misunderstood; what I mean is entering the Class A production area through the stairwell, with a blast-proof vestibule required in between. Under normal circumstances, can the two fire doors of the explosion-proof doorway be opened simultaneously?
Clean and explosion-proof areas in pharmaceutical factories all have isolation buffer zones, with a rule stating that two isolation doors cannot be opened simultaneously
The explosion-proof door vestibule must be installed out of alignment; otherwise, it will not be effective. Mine are usually normally closed type; there aren’t two doors that lock automatically.
In the clean area, the explosion-proof vestibule serves both as an explosion-proof door and an airlock, with interlocking in place; in other cases, it can remain closed.
The two fire doors of the explosion-proof vestibule are arranged out of alignment so that, in abnormal situations, if both doors open at the same time, it will not allow explosive hazards to spread to areas that are not affected by explosions.