10 Selection of Expansion Tank Volume and Preset Pressure
Calculating the preset pressure of the expansion tank
If 𝑃𝑔 is less than the initially preset pressure of the expansion tank, you do not need to adjust the preset pressure of the
expansion tank. In general, the initially preset pressure of the expansion tank is 1.5 bar.
Calculating the minimum volume of the expansion tank
Example 1: Total water volume of the water system of a project is 200 L. The highest point of the water system is 12 m
higher than the hydraulic module. Calculate the preset pressure and volume of the expansion tank.
Answer: The preset pressure of the expansion tank is 12 / 10 + 0.3 = 1.5 bar. The required minimum volume of the
expansion tank is V = 0.0693 * 200 / (2.5-1.5) = 13.86 L.
Example 2: Total water volume of the water system of a project is 72 L. The highest point of the water system is 0 m higher
than the hydraulic module. Calculate the preset pressure and volume of the expansion tank.
Answer: The preset pressure of the expansion tank𝑃𝑔 = 0 / 10 + 0.3 = 0.3 bar, which is 1.5 bar less than the initially preset
pressure of the expansion tank. The required minimum volume of the expansion tank is V = 0.0693 * 72 / (2.5-1.5) = 4.98 L.
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