The oil stored in the inner floating roof tank is completely covered by the inner floating disc, so the mechanical breathing valve and the Y-type hydraulic safety valve are no longer installed at the top of the tank. However, in actual use, if the sealing of each joint is slightly tight, it will cause oil and gas to emanate. When the floating disc is lowered, the space between the floating disc and the dome is due to evaporation of the oil film adhered to the tank wall. There will still be oil vapor accumulation. In order to dilute and diffuse these oil and gas in time, the concentration of oil vapor is prevented from increasing to the limit of combustion and explosion, and vent holes are formed around the top of the tank and the wall of the tank. The venting hole also acts as an overflow when the oil level is too high and the automatic alarm device fails. The tank wall vents should be evenly symmetric to allow sufficient air convection to minimize the oil vapor concentration between the tank float and the dome.
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