Closed Expansion Tank Sizing

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

Temperature in degrees Fahrenheit - 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 temperatures.

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

Temperature in degrees Celsius- 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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• Heating - Heating systems - capacity and design of boilers, pipelines, heat exchangers, expansion systems and more

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