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Expansion tank - is designed to compensate for changes in the volume of water that occur when its temperature changes in a closed circuit heating system.
Water is an incompressible liquid that increases its volume when heated. In a closed circuit heating system, the heating of water and the increase in volume can lead to a significant increase in pressure, which can damage the heating system elements.
During the heating of the heating system, the excess water volume enters the expansion tank, stretching the membrane and compressing the air, and in the moment of cooling, the deficient volume is displaced from the tank by compressed air. Minor leaks of the heat transfer fluid in the heating system are also compensated for by water displaced from the expansion tank, if the reserve volume is provided for in its calculation.
Expansion tanks are installed in heating and water supply systems, boiler rooms and simply in closed circuits with heat supply to water.
In heating systems, membrane expansion tanks are installed at a thermal capacity of less than 6 MW, since in systems with greater capacity, constant water leaks usually require round-the-clock operation of the feed pumps.
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