Internal floating roof vent valve
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I just arrived at the tank area and saw that the internal floating roof tank was equipped with a flame arrester and a vent valve on its roof; there were also ventilation holes around the top of the tank wall, which allow air to be expelled outward. Is the vent valve on the roof redundant?
Are you sure you saw a breather valve on the tank with vents? A storage tank with ventilation holes must be an internal floating roof type, suitable for storing light and volatile oils such as aviation fuel; a flame arrester is installed on the top of the tank.
Reply to 2# Storage Operator: It is a breathing valve equipped with a flame arrester; this is probably done for safety reasons, so that the breathing valve opens when the pressure inside the tank increases or decreases rapidly and the vent holes are not fast enough to release air
The top of the tank is equipped with breathing vents, and a metal mesh surrounds it to serve as a fire barrier
Since the internal floating roof covers the oil surface in an internal floating roof tank, the vapor space is essentially eliminated, resulting in very low evaporation losses; therefore, no mechanical vent valves or safety valves are installed on the tank roof. However, in practice, leaks of oil and gas still inevitably occur at the ring gaps on the floating roof or at other joints of attachments. To prevent the accumulation of oil and gas to dangerous levels, ventilation holes are provided on both the top and sides of the oil tank.
Could it be a misreading? Is it not a breathing valve but rather a vent hole with a flame arrester?
Mechanical breather valves and hydraulic safety valves are found on dome tanks, while only flame arresters seem to be present on internal floating roofs
Generally, that doesn’t happen. But in our case, we have two heavy oil storage tanks for which ear vents were installed along with breather valves – a rather stupid design……
We have them all, but the vents have been sealed off! ! :lol
We have floating disks, and there are vent valves on the tank top; it seems that safety regulations do not require the use of flame arrestors.
Change the vault to an internal floating roof. .