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Sizing of Closed Expansion Tanks

Sizing of low temperature closed expansion tanks

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Temperatures in degrees Fahrenheit and pressure in psig

  • initial temperature 50oF
  • 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.

Closed expansion tanks - sizing diagram in fahrenheit

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

Closed expansion tanks - sizing diagram in psig

Temperatures in degrees Celsius and pressure in kPa

  • initial temperature 10oC
  • 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.

Closed expansion tanks - sizing diagram in celsius

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

Closed expansion tanks - sizing diagram in kPa

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  • en: closed expansion low temperature tank sizing
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