# Sizing of Diaphragm Expansion Tanks

## Low temperature diaphragm expansion tank sizing - calculate tank volume and acceptance volume

### Temperature in degrees *Fahrenheit* and pressure in *psig*

- initial temperature
*50*^{o}F - 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
*10*^{o}C - 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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- en: diaphragm expansion low temperature tank volume acceptance sizing