Closed Expansion Tanks - Volume vs. Temperature and Pressure

Temperatures in degrees Fahrenheit and pressure in psig

• initial temperature 50^oF
• initial pressure 10 psig
• maximum operating pressure 30 psig
• safety factor aprox. 2

The diagram below can be used to estimate the size of a closed expansion tank at low temperature.

For initial and maximum pressures different from above - multiply the tank size with the a correction factor estimated from the diagram below:

Temperatures in degrees Celsius and pressure in kPa

• initial temperature 10^oC
• initial pressure 70 kPa
• maximum operating pressure 200 kPa

The diagram below can be used to estimate the size of a closed expansion tank at low temperatures.

For initial and maximum pressures different from above - multiply the tank size with the a correction factor estimated from the diagram below:

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• Engineering ToolBox, (2008). Closed Expansion Tanks - Volume vs. Temperature and Pressure. [online] Available at: https://www.engineeringtoolbox.com/closed-expansion-tank-sizing-d_1271.html [Accessed Day Mo. Year].

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