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Diaphragm Expansion Tanks

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Temperature in degrees Fahrenheit and pressure in psig

  • initial temperature 50oF
  • initial pressure 10 psig
  • maximum operating pressure 30 psig
  • safety factor aprox. 2
  • acceptance factor aprox. 0.5

The diagram below can be used to estimate the tank volume and acceptance volume of a diaphragm 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 10oC
  • initial pressure 70 kPa
  • maximum operating pressure 200 kPa
  • safety factor aprox. 2
  • acceptance factor aprox. 0.5

The diagram below can be used to estimate the tank volume and acceptance volume 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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Related Topics

• Heating Systems

Design of heating systems - capacities and design of boilers, pipelines, heat exchangers, expansion systems and more.

Related Documents

Closed Expansion Tanks - Volume vs. Temperature and Pressure

Sizing of low temperature closed expansion tanks.

Hot Water Expansion Tanks - Sizing

Required hot water expansion volume in open, closed and diaphragm tanks.

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