How Does Pressure Affect Dissolved Oxygen in Water Systems?

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SUMMARY

This discussion centers on calculating the pressure drop in a plumbing system when water is pressurized to 100 PSI and air is present. The key concept is Henry's Law, which relates the solubility of gases in liquids to pressure. Users are encouraged to determine the equilibrium pressure at which air no longer dissolves in water after the pressure source is removed. The conversation highlights the need for specific calculations involving the concentration of air in the solution and the volumes of water and air in the system.

PREREQUISITES
  • Understanding of Henry's Law and its application in gas solubility
  • Basic knowledge of pressure measurement in PSI
  • Familiarity with fluid dynamics in plumbing systems
  • Ability to perform calculations involving concentration and volume
NEXT STEPS
  • Research how to apply Henry's Law for calculating gas solubility under varying pressures
  • Learn about fluid dynamics principles relevant to plumbing systems
  • Explore methods for estimating pressure drops in gas-liquid systems
  • Investigate the relationship between concentration changes and pressure in gas solubility
USEFUL FOR

Engineers, plumbing professionals, and anyone involved in fluid mechanics or gas solubility calculations will benefit from this discussion.

fhon
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Hello Everyone,

I've been trying to find an answer to this but am not getting anywhere. Any help would be greatly appreciated!

I need to be able to calculate (or more likely estimate) the pressure drop I can expect when putting water under pressure if I know there is air in the system.

For example if I have a plumbing system that I pressurize to 100 PSI then removed the pressure source. I know how much water is in the system and can estimate how much air is trapped in sections where I can not purge it. I know the pressure will drop as air is dissolved into the water but at what PSI will it reach equilibrium and no longer dissolve air into the water?

Can anyone help point me in the right direction?
 
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Google Henry’s law.
 
Thank you. Henry's law looks like what I need, but I cannot for the life of me figure out how to use it to calculate the pressure drop I will have. Sorry to be so needy but any help would really be appreciated
 
How about this? I've been able to calculate the difference in concentration of air in the solution after applying the 100 PSI to it using Henry's law. Now if I know the previous and current concentration and the volume of water and air I must be able to use some formula for the pressure. Am I on the right track here?
 
fhon said:
How about this? I've been able to calculate the difference in concentration of air in the solution after applying the 100 PSI to it using Henry's law. Now if I know the previous and current concentration and the volume of water and air I must be able to use some formula for the pressure. Am I on the right track here?
Why don't you specify a problem, and I'll work an example for you? Specify the total amount of water and the total amount of air, and the pressure you want to consider.
 

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