6/14/2023 0 Comments All expansions for pocket tanksThis diaphragm conforms to the internal steel surface of the tank when the air side is pressurized, as shown in Figure 2.įigure 4 Mounting diaphragm type expansion tankġ. Today, the most commonly-specified expansion tank for hydronic heating or cooling systems uses a highly flexible butyl rubber or EPDM diaphragm to completely separate the air and water inside the tank. If not equipped with the proper fittings they can also fill with water over time and become “water-logged.” They are seldom used in modern hydronic systems, especially in residential or light commercial building applications. As such they are more expensive, heavier and require more mounting space. An example of such a tank is shown in Figure 1.Īlthough functional, standard expansion tanks are significantly larger than modern diaphragm-type or bladder-type expansion tanks. This allows air released from the system’s initial charge of water to move upward into the tank. This type of expansion tank is typically suspended from the ceiling of a mechanical room. Older systems often used “standard “expansion tanks, in which air and water are in direct contact.
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