![]() ![]() It also allows prevents air in the piping from getting trapped on the water side of the expansion tank when the system is first filled. This reduces stress on the tank’s connection relative to horizontal mounting. ![]() Do mount tank vertically with connection at top: It is also best to install diaphragm type expansion tanks vertically with the piping connection at the top. Figure 3 shows several acceptable placements of the tank.Ģ. It also enhances the ability of air vents to eject air from the system. Increased system pressure helps protect the circulator from cavitation and often allows for quieter operation. This allows the differential pressure created by the circulator to be added to the static pressure in the system. Doing so minimizes the pressure drop between the point where the tank connects to the circuit, that is the point where there is no change in pressure when the circulator turns on, and the circulator’s inlet. Do Pump Away: A detail that was once understood and respected in the hydronics industry, but slowly faded in priority against other packaging or installation “conveniences,” is to connect the expansion tank into a hydronic piping circuit near the inlet of the circulator. This 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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