Tanks are commonly used for storing a variety of liquids. To protect the liquid contents from microbial or particulate contaminant, it is customary to install a vent filter on the tank. When liquid is added or removed from a tank, air must move in or out of the tank to fill the changing airspace above the liquid. A tank vent filter allows air to flow in both directions and prevents possible damage to the tank that could result if air is compressed during tank filling or a vacuum is created during tank emptying.
For a vent filter to function properly, the media must remain dry, so avoid contact with either the contents in the tank or environmental conditions. A wetted filter is impermeable to the bulk flow of air until the pressure reaches a point where the liquid in the pores is displaced (bubble point!). Since tank venting is done at essentially atmospheric pressure, this pressure is not achieved and may be higher than the vacuum or pressure rating on the tank. As such, it is best practice to choose a hydrophobic material for the application, with PTFE membrane being the optimal choice.
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