Are there any regulations regarding the airflow direction of explosion-proof axial flow fans on the walls of compressor rooms?
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How is the airflow direction of the explosion-proof axial flow fans on the walls of the initial normal pressure oil and gas compressor room specified? From the inside out, or from the outside in?
The direction of rotation should align with the flow direction of the gas; it is necessary to take into account both the outflow and the inflow, with the ultimate goal being to facilitate the flow of gas. Imagine that if the flow is inward, it could lead to a complete mixing of the flammable and explosive gases inside with the air, resulting in an increasingly high concentration. If exhaust is directed outward, the leaked gas can flow with the air and dilute in the atmosphere. It should flow outward, I think. But the indoor air inlet routes should also be considered for reference.
The fans on the walls of our natural gas compressor plant blow air inside the building, while the axial flow fans on the roof draw air out! Both supply and exhaust ventilation are necessary in a sealed factory building, so as to ensure normal air circulation inside it!
Are there any standards or guidelines? The original design of our factory building called for air flow from the outside in, and that has been the case for over a decade now. The direction for recent safety inspections has been reversed; it is now required to proceed from the inside out