How can I calculate the volume of liquid gas in my cylinder?

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SUMMARY

The discussion focuses on calculating the volume of liquid CO2 in a 50L cylinder for a medical centrifuge machine. Participants emphasize that under pressure, CO2 remains mostly liquid at room temperature, with an estimated 90-95% of the cylinder's contents being liquid. Concerns about high G-forces potentially blocking the valve are addressed, with suggestions to use a siphon tube to facilitate liquid extraction. The importance of the cylinder's weight capacity for CO2 is also highlighted as a critical factor in ensuring proper operation.

PREREQUISITES
  • Understanding of gas laws, specifically related to CO2 behavior under pressure.
  • Familiarity with the concept of liquid-gas phase transitions.
  • Knowledge of cylinder specifications, including weight capacity for CO2.
  • Basic principles of fluid dynamics as they relate to high G-forces.
NEXT STEPS
  • Research the ideal gas law and its application to CO2 in pressurized systems.
  • Learn about the properties of CO2 at various temperatures and pressures.
  • Investigate the design and function of siphon tubes in gas cylinders.
  • Explore safety protocols for handling pressurized gas cylinders in medical applications.
USEFUL FOR

Engineers, medical equipment technicians, and anyone involved in the design or operation of pressurized gas systems, particularly in medical applications.

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Hi all

I would like to know how to calculate the volume of liquid gas (CO2)
inside a cylinder of 50L.

Its for a medical centrifuge machine and
we will have problems with high G's that will move the liquid to the sides...
(and could block the valve)

Any formulas help? (i don't have any background in chemics - gases).

TKS
 
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Most of the CO2 would be liquid (@ room temp) once it is put under pressure. Your cylinder should tell you how much CO2 (by weight) you should put in your cylinder. If you assume say 90-95% of it being liquid, I think you'd be safe.

I am wondering what you mean by "blocking the valve." The valve should be able to slow the liquid as well, and the liquid will just turn to gas as it escapes. If you are concerned about getting the contents out of the tank, just get one with a siphon tube so that most of the liquid comes out.
 

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