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AMTROLExpansion TankSizing Chart

The selection of the expansion tank should be made taking into account its temperature characteristics and strength. The pressure and temperature at the tank connection point should not exceed the maximum allowable values.

Since expansion tanks in the heating system are required not only to compensate for the changing water volume but also to replenish minor leaks of the heat carrier — a certain water reserve, called the operating volume, is provided in the expansion tank. The above calculation algorithm includes an operating water volume of 3% of the heating system capacity.

TacoExpansion tanksizing

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The volume of the expansion tank should be equal to or greater than the volume obtained from the calculation. There are no negative consequences of overestimating the volume beyond the calculated value.

Hydronicexpansion tanksizing calculator

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Expansion tanksizing rule of thumb

Resources within each section are grouped by assembly size.) 2000B · ​2000SS​ 3000SS · 3000B · 3000BM1 · 4000SS

If the installation of expansion tanks is planned in a room, it should be considered that tanks with a diameter greater than 750 mm and a height greater than 1.5 m may not fit through doors, and mechanized means may be required for their transportation. In this case, it is better to opt for several smaller membrane tanks instead of one large one.

1. When using glycol mixtures as the heat carrier, it is recommended to select an expansion tank with a volume 50% greater than the calculated volume.

How to size an expansion tankfor a chilled water system

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The calculation of the expansion tank is performed to determine its volume, the minimum pipe diameter, the initial pressure of the gas space, and the initial operating pressure in the heating system.

Expansion tanksizing calculator

The calculation methodology for expansion tanks is complex and routine, but in general, the following relationship can be established between the tank volume and the influencing parameters:

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How to size expansion tankfor boiler

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