Calculation of an expansion tank is performed to determine its volume, the minimum diameter of the connecting pipeline, the initial pressure of the gas space, and the initial operating pressure in the heating system.

Expansion tank sizingchilled water

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Expansion Tank SizingExcel

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If the installation of expansion tanks is planned indoors, it should be taken into account that tanks with a diameter of more than 750 mm and a height of more than 1.5 m may not pass through the door, and mechanization means will be needed to move them. In this case, it is better to prefer not one, but several membrane tanks of smaller capacity.

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1. When using glycol mixtures as hot-water, it is recommended to choose an expansion tank with a volume that is 50% larger than the calculated one.

Hydronicexpansion tank sizingcalculator

Expansion tank sizingcalculator

The method of calculating expansion tanks is complex and routine, but in general, the following relationships can be established between the volume of the tank and the parameters affecting it:

AMTROLexpansion tank Sizingpdf

2. The first sign of an incorrectly calculated expansion tank or its incomplete adjustment is when the safety valve often trips.

The volume of the expansion tank must be greater than or equal to the volume obtained as a result of the calculation. There are no negative consequences from overestimating the volume, beyond the calculated one.

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Expansion tank sizingChart

Since expansion tanks in the heating system are necessary not only to compensate for the changing volume of water but also to replenish minor hot-water leaks, a certain amount of water, called the operating volume, is provided in the expansion tank. In the calculation algorithm given above, the operational volume of water is laid down in the amount of 3% of the capacity of the heating system.

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Selection of an expansion tank should be performed taking into account its temperature characteristics and strength. The pressure and temperature at the point of connection of the tank should not exceed the maximum permissible values.